Zeitschriftenartikel: „Fluid effects“

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Roper, T. J. „Effects of Novelty On Taste-Avoidance Learning in Chicks“. Behaviour 125, Nr. 3-4 (1993): 265–81. http://dx.doi.org/10.1163/156853993x00281.

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AbstractFive experiments were conducted to investigate the effect of novelty on visually-mediated taste-avoidance learning in domestic chicks. In experiments l a and b, chicks were reared with either uncoloured or blue fluid in their home cages, and then required to discriminate between blue and uncoloured fluids that were either palatable or unpalatable (quinine-adulterated). For some chicks the distasteful fluid was novel in appearance, for others it was familiar. In both experiments chicks readily discriminated between a novel unpalatable fluid and a familiar palatable one, but failed to discriminate between a familiar unpalatable fluid and a novel palatable one. This failure to discriminate resulted from avoidance of the palatable fluid. In neither experiment did novelty enhance the rate of avoidance learning. Experiment 2 tested more directly the effect of novelty on speed of avoidance learning. Chicks were reared on either red or blue palatable fluid, then tested with either red or blue distasteful fluid. Avoidance learning was more rapid when the distasteful fluid was novel in colour, in both red-reared and blue-reared chicks. Experiment 3 investigated the inability of chicks to discriminate between a familiar unpalatable fluid and a novel palatable one, demonstrated in experiment 1. Chicks were required to discriminate between different-coloured palatable and unpalatable fluids when both were familiar in appearance (experiment 3a) or when both were novel (experiment 3b). Discrimination occurred in the first case but not in the second. In addition, avoidance learning was slower when both unpalatable fluids were familiar. I conclude that (a) novelty faciliates visually-mediated taste-avoidance learning in chicks and (b) the failure of chicks to discriminate a novel palatable fluid from a familiar unpalatable one depends on the relative novelty of the palatable fluid and not on the relative familiarity of the unpalatable one. The results are discussed in the context of warning coloration and are explained in terms of an interaction between unlearned and learned avoidance tendencies.

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Jamil, Muhammad, und Najeeb Alam Khan. „Slip Effects on Fractional Viscoelastic Fluids“. International Journal of Differential Equations 2011 (2011): 1–19. http://dx.doi.org/10.1155/2011/193813.

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Unsteady flow of an incompressible Maxwell fluid with fractional derivative induced by a sudden moved plate has been studied, where the no-slip assumption between the wall and the fluid is no longer valid. The solutions obtained for the velocity field and shear stress, written in terms of Wright generalized hypergeometric functions , by using discrete Laplace transform of the sequential fractional derivatives, satisfy all imposed initial and boundary conditions. The no-slip contributions, that appeared in the general solutions, as expected, tend to zero when slip parameter is . Furthermore, the solutions for ordinary Maxwell and Newtonian fluids, performing the same motion, are obtained as special cases of general solutions. The solutions for fractional and ordinary Maxwell fluid for no-slip condition also obtained as limiting cases, and they are equivalent to the previously known results. Finally, the influence of the material, slip, and the fractional parameters on the fluid motion as well as a comparison among fractional Maxwell, ordinary Maxwell, and Newtonian fluids is also discussed by graphical illustrations.

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Belayneh, Mesfin, Bernt Aadnøy und Simen Moe Strømø. „MoS2 Nanoparticle Effects on 80 °C Thermally Stable Water-Based Drilling Fluid“. Materials 14, Nr. 23 (25.11.2021): 7195. http://dx.doi.org/10.3390/ma14237195.

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Bentonite-based drilling fluids are used for drilling, where inhibitive fluids are not required. The rheological and the density properties of the drilling fluids are highly affected by high temperature and pressure. Due to high temperature, the clay particles stick together, and the fluid system becomes more flocculated. Poorly designed drilling fluid may cause undesired operational issues such as poor hole cleaning, drill strings sticking, high torque and drag. In this study, the 80 °C thermally stable Herschel Bulkley’s and Bingham plastic yield stresses drilling fluids were formulated based on lignosulfonate-treated bentonite drilling fluid. Further, the impact of a MoS2 nanoparticle solution on the properties of the thermally stable base fluid was characterized. Results at room temperature and pressure showed that the blending of 0.26 wt.% MoS2 increased the lubricity of thermally stable base fluid by 27% and enhanced the thermal and electrical conductivities by 7.2% and 8.8%, respectively.

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STOKES, JASON R., LACHLAN J. W. GRAHAM, NICK J. LAWSON und DAVID V. BOGER. „Swirling flow of viscoelastic fluids. Part 2. Elastic effects“. Journal of Fluid Mechanics 429 (25.02.2001): 117–53. http://dx.doi.org/10.1017/s0022112000002901.

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A torsionally driven cavity has been used to examine the influence of elasticity on the swirling flow of constant-viscosity elastic liquids (Boger fluids). A wealth of phenomena is observed as the degree of inertia, elasticity and viscous forces are varied by using a range of low- to high-viscosity flexible polyacrylamide Boger fluids and a semi-rigid xanthan gum Boger fluid. As the inertia is decreased and elasticity increased by using polyacrylamide Boger fluids, the circulation rates for a ‘Newtonian-like’ secondary flow decreases until flow reversal occurs owing to the increasing magnitude of the primary normal stress difference. For each polyacrylamide fluid, the flow becomes highly unstable at a critical combination of Reynolds number and Weissenberg number resulting in a new time-dependent elastic instability. Each fluid is characterized by a dimensionless elasticity number and a correlation with Reynolds number is found for the occurrence of the instability. In the elasticity dominated flow of the polyacrylamide Boger fluids, the instability disrupts the flow dramatically and causes an increase in the peak axial velocity along the central axis by as much as 400%. In this case, the core vortex spirals with the primary motion of fluid and is observed in some cases at Reynolds numbers much less than unity. Elastic ‘reverse’ flow is observed for the xanthan gum Boger fluid at high Weissenberg number. As the Weissenberg number decreases, and Reynolds number increases, counter-rotating vortices flowing in the inertial direction form on the rotating lid. The peak axial velocity decreases for the xanthan gum Boger fluid with decreasing Weissenberg number. In addition, several constitutive models are used to describe accurately the rheological properties of the fluids used in this work in shear and extensional flow. This experimental investigation of a complex three-dimensional flow using well-characterized fluids provides the information necessary for the validation of non-Newtonian constitutive models through numerical analysis of the torsionally driven cavity flow.

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Gallagher, John S., und Graham Morrison. „Modeling of impurity effects in fluids and fluid mixtures“. Journal of Chemical & Engineering Data 32, Nr. 4 (Oktober 1987): 412–18. http://dx.doi.org/10.1021/je00050a007.

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Zhang, Jun Hui, Zhi Li Zhang, De Cai Li und Jie Yao. „Effects of Magnetic Fluid on Magnetic Fluid Damper“. Key Engineering Materials 512-515 (Juni 2012): 1479–83. http://dx.doi.org/10.4028/www.scientific.net/kem.512-515.1479.

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A magnetic fluid damper which based on the principle of second-order buoyancy of magnetic liquid has been presented. During the process of damping, besides the elastic deformation of magnetic liquid adsorbed by permanent magnet, the main ways of energy dissipation are the friction functions, which include the friction between magnets and magnetic liquid, magnetic fluid and magnetic fluid and magnetic fluid and the shell of the damper. In order to investigate influence of magnetic fluid on damping effect, a series of experiments under different magnetic fluid with related parameters including magnetic fluid volume and saturation magnetization are carried out. It is found that both volume and saturation magnetization of magnetic fluid have optimal value on the damping effect of the damper.

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Yin, Shao Hui, Zhi Qiang Xu, Hong Jie Duan und Feng Jun Chen. „Effects of Magnetic Fluid on Machining Characteristics in Magnetic Field Assisted Polishing Process“. Advanced Materials Research 797 (September 2013): 396–400. http://dx.doi.org/10.4028/www.scientific.net/amr.797.396.

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Magnetic characteristics of three magnetic polishing fluids such as magnetic fluid (MF), magnetorheological fluid (MRF), and magnetic compound fluid (MCF) under magnetic field are experimentally investigated and analyzed. Their magnetic cluster structures under action of magnet field are observed, and their magnetic cluster models are established. Magnetic flied assisted polishing experiments for tungsten carbide are developed used these three kinds of magnetic fluids, material removal and surface roughness are respectively measured. At last, the machining characteristic of three magnetic fluids are contrasted and discussed according to experimental results.

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Zhang, Zhi Li, Nan Nan Di, Le Bai, Yang Yang und De Cai Li. „Investigation on Magnetoviscous Effects of Water-Based Magnetic Fluid“. Solid State Phenomena 281 (August 2018): 906–11. http://dx.doi.org/10.4028/www.scientific.net/ssp.281.906.

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Magnetic fluid or called ferro-fluid is such kind of magnetic nanomaterials, which is stable of solid-liquid two phase colloidal solution composited by magnetic nanoparticles coated by surfactant and highly disperse in a carrier liquid. The basis of magnetic fluid widely applied mainly is due to their unique magnetic properties and rheological properties, which enable its action as intelligent control materials in the magnetic field so as to achieve the goal of magnetic liquid dynamic seal, magnetic damping vibration and so on. In our recent research, the water-based magnetic fluid was synthesized using a co-precipitation method and its magnetorheological properties were studied. During the process, the magnetorheological properties of stable water-based magnetic fluids were determined by magnetic rheometer. The results show that the shear-thinning behavior of magnetic fluids was observed both in the absence and presence of magnetic field. However, there was a remarkable magnetoviscous effect with magnetic field function and the unexpected variation of shear stress was related to the chain aggregation. Furthermore, the constitutive equation of water-based magnetic fluid at a low magnetic field was discussed.

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Tom Joseph, Chrison, und Vinay S. Appannavar. „FLUID MANAGEMENT IN SPACE: OVERCOMING GRAVITATIONAL CHALLENGES FOR SAFE IV THERAPY ON MARS AND BEYOND“. International Journal of Advanced Research 12, Nr. 09 (30.09.2024): 1525–27. http://dx.doi.org/10.21474/ijar01/19590.

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In space and on other planets, the challenges of fluid management for human health, particularly through intravenous (IV) therapy, become significant due to the altered effects of gravity on fluids. Understanding how microgravity and varying gravitational environments impact fluid dynamics in the body and IV administration is essential for medical care in extraterrestrial settings. This paper reviews the effects of gravity on fluids, particularly in space and Martian environments, explores the challenges of IV fluid therapy in zero gravity, and offers potential solutions for managing fluid therapy in these conditions. By combining research from terrestrial fluid management practices and data from space missions, we aim to offer insights into the safe administration of IV fluids in space and beyond.

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Trung, Hieu Nguyen, Jun Ishimatsu und Hiromi Isobe. „Effects of Grinding Fluid Excited by Ultrasonic Vibration“. Materials Science Forum 874 (Oktober 2016): 308–12. http://dx.doi.org/10.4028/www.scientific.net/msf.874.308.

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Ultrasonic excited fluid has been researched for machining of hard-to-grind materials. Ultrasonic vibration is applied to grinding fluid by an ultrasonic oscillating comb-shape effecter with integrated nozzle. Grinding fluid discharges from a nozzle placed between the comb’s feet and passes through the vacant space between comb teeth. By this setup, flowing grinding fluid can be continuously excited by ultrasonic vibration. Based on the principle of an ultrasonic washing machine, impulsive force caused by cavitation bubble will reduce the adhesion of chips on the cutting face of grain and chip pockets. Some effects of ultrasonic excited grinding fluid have been recorded such as reducing grinding heat in the case of grinding for Titanium alloy and decreasing in grinding force, improving surface roughness in the case of grinding for Aluminum and stainless alloy. However, the reason of better grinding performance is still unknown. Therefore, experiments conducted with different type of grinding fluids with and without ultrasonic vibration are needed. Pure Titanium, which considered a hard-to-cut material, is chosen as work material. Grinding forces and grinding heat during grinding will be measured and evaluated to clarify the mechanism of ultrasonic excited grinding fluid.

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Murti, Vishav, und Esar Ahmad. „Wind Effects on Bridge Deck: A Computational Fluid Dynamics Study“. International Journal of Science and Research (IJSR) 12, Nr. 9 (05.09.2023): 1056–59. http://dx.doi.org/10.21275/sr23905111754.

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MOYERS-GONZÁLEZ, M. A., I. A. FRIGAARD, O. SCHERZER und T. P. TSAI. „Transient effects in oilfield cementing flows: Qualitative behaviour“. European Journal of Applied Mathematics 18, Nr. 4 (August 2007): 477–512. http://dx.doi.org/10.1017/s0956792507007048.

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We present an unsteady Hele–Shaw model of the fluid–fluid displacements that take place during primary cementing of an oil well, focusing on the case where one Herschel–Bulkley fluid displaces another along a long uniform section of the annulus. Such unsteady models consist of an advection equation for a fluid concentration field coupled to a third-order non-linear PDE (Partial differential equation) for the stream function, with a free boundary at the boundary of regions of stagnant fluid. These models, although complex, are necessary for the study of interfacial instability and the effects of flow pulsation, and remain considerably simpler and more efficient than computationally solving three-dimensional Navier–Stokes type models. Using methods from gradient flows, we demonstrate that our unsteady evolution equation for the stream function has a unique solution. The solution is continuous with respect to variations in the model physical data and will decay exponentially to a steady-state distribution if the data do not change with time. In the event that density differences between the fluids are small and that the fluids have a yield stress, then if the flow rate is decreased suddenly to zero, the stream function (hence velocity) decays to zero in a finite time. We verify these decay properties, using a numerical solution. We then use the numerical solution to study the effects of pulsating the flow rate on a typical displacement.

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Yasappan, Justine, Ángela Jiménez-Casas und Mario Castro. „Asymptotic Behavior of a Viscoelastic Fluid in a Closed Loop Thermosyphon: Physical Derivation, Asymptotic Analysis, and Numerical Experiments“. Abstract and Applied Analysis 2013 (2013): 1–20. http://dx.doi.org/10.1155/2013/748683.

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Fluids subject to thermal gradients produce complex behaviors that arise from the competition with gravitational effects. Although such sort of systems have been widely studied in the literature for simple (Newtonian) fluids, the behavior of viscoelastic fluids has not been explored thus far. We present a theoretical study of the dynamics of a Maxwell viscoelastic fluid in a closed-loop thermosyphon. This sort of fluid presents elastic-like behavior and memory effects. We study the asymptotic properties of the fluid inside the thermosyphon and the exact equations of motion in the inertial manifold that characterizes the asymptotic behavior. We derive, for the first time, the mathematical derivations of the motion of a viscoelastic fluid in the interior of a closed-loop thermosyphon under the effects of natural convection and a given external temperature gradient.

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Conroy, D. T., O. K. Matar, R. V. Craster und D. T. Papageorgiou. „Compound viscous thread with electrostatic and electrokinetic effects“. Journal of Fluid Mechanics 701 (30.04.2012): 171–200. http://dx.doi.org/10.1017/jfm.2012.145.

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AbstractBreakup of an electrified viscous compound jet, surrounded by a dielectric gas, is investigated theoretically. The fluids are considered to be electrolytes and the core fluid viscosity is assumed to be much larger than that of the annular fluid. Axisymmetric configurations are considered with the three fluids bound by a cylindrical electrode that is held at a constant voltage potential. The model equations are investigated asymptotically in the long-wave limit, yielding two cases corresponding to a negligible surface charge with electrokinetic effects and a leaky dielectric model. A linear stability analysis for both cases is performed and the electrical effects are found to have a stabilizing effect, which is consistent with previous investigations of single electrified jet breakup at small wavenumbers. The one-dimensional equations are also solved numerically. The electric field is found to cause satellite formation in the core fluid, which does not occur in the purely hydrodynamic case, with the satellite size increasing with the strength of the electric field.

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Zhang, Chao, und Igor Menshov. „Eulerian modelling of compressible three-fluid flows with surface tension“. Russian Journal of Numerical Analysis and Mathematical Modelling 34, Nr. 4 (27.08.2019): 225–40. http://dx.doi.org/10.1515/rnam-2019-0019.

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Abstract The paper addresses a numerical approach for calculating three-fluid hydrodynamics on Eulerian grids with taking into account surface tension and viscous effects. The medium considered consists of three different compressible fluids separated with interfaces. The fluids are assumed to be immiscible. The three-fluid flow is described by the reduced equilibrium model derived from the non-equilibrium three-phase model by performing an asymptotic analysis in the limit of zero relaxation time. To simulate surface tension effects, we extend the continuum surface force (CSF) model of two-fluid incompressible flow to the case of compressible three-fluid flow. A thermodynamically consistent surface energy of the compressible three-fluid flow is obtained by means of splitting the surface tension between distinct fluids into pairs of specific phase related surface tensions. Some aspects of the numerical method for solving the system of governing equations of the considered three-fluid model are discussed. Numerical results presented demonstrate the accuracy and robustness of the proposed model in simulating dynamics of interfaces and surface tension effects.

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Urbiola-Soto, Leonardo, und Marcelo Lopez-Parra. „Liquid Self-Balancing Device Effects on Flexible Rotor Stability“. Shock and Vibration 20, Nr. 1 (2013): 109–21. http://dx.doi.org/10.1155/2013/742163.

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Nearly a century ago, the liquid self-balancing device was first introduced by M. LeBlanc for passive balancing of turbine rotors. Although of common use in many types or rotating machines nowadays, little information is available on the unbalance response and stability characteristics of this device. Experimental fluid flow visualization evidences that radial and traverse circulatory waves arise due to the interaction of the fluid backward rotation and the baffle boards within the self-balancer annular cavity. The otherwise destabilizing force induced by trapped fluids in hollow rotors, becomes a stabilizing mechanism when the cavity is equipped with adequate baffle boards. Further experiments using Particle Image Velocimetry (PIV) enable to assess the active fluid mass fraction to be one-third of the total fluid mass. An analytical model is introduced to study the effects of the active fluid mass fraction on a flexible rotor supported by flexible supports excited by bwo different destabilizing mechanisms; rotor internal friction damping and aerodynamic cross-coupling. It is found that the fluid radial and traverse forces contribute to the balancing action and to improve the rotor stability, respectively.

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Barlow, Ashley, Brooke Barlow, Nancy Tang, Bhavik M. Shah und Amber E. King. „Intravenous Fluid Management in Critically Ill Adults: A Review“. Critical Care Nurse 40, Nr. 6 (01.12.2020): e17-e27. http://dx.doi.org/10.4037/ccn2020337.

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Topic This article reviews the management of intravenous fluids and the evaluation of volume status in critically ill adults. Clinical Relevance Intravenous fluid administration is one of the most common interventions in the intensive care unit. Critically ill patients have dynamic fluid requirements, making the management of fluid therapy challenging. New literature suggests that balanced salt solutions may be preferred in some patient populations. Purpose of Paper The bedside critical care nurse must understand the properties of various intravenous fluids and their corresponding impact on human physiology. The nurse’s clinical and laboratory assessments of each patient help define the goals of fluid therapy, which will in turn be used to determine the optimal patient-specific selection and dose of fluid for administration. Nurses serve a vital role in monitoring the safety and efficacy of intravenous fluid therapy. Although this intervention can be lifesaving, inappropriate use of fluids has the potential to yield detrimental effects. Content Covered This article discusses fluid physiology and the goals of intravenous fluid therapy, compares the types of intravenous fluids (isotonic crystalloids, including 0.9% sodium chloride and balanced salt solutions; hypotonic and hypertonic crystalloids; and colloids) and their adverse effects and impact on hemodynamics, and describes the critical care nurse’s essential role in selecting and monitoring intravenous fluid therapy.

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Cusack, Rachael, Susan O’Neill und Ignacio Martin-Loeches. „Effects of Fluids on the Sublingual Microcirculation in Sepsis“. Journal of Clinical Medicine 11, Nr. 24 (08.12.2022): 7277. http://dx.doi.org/10.3390/jcm11247277.

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Sepsis is one of the most common and deadly syndromes faced in Intensive Care settings globally. Recent advances in bedside imaging have defined the changes in the microcirculation in sepsis. One of the most advocated interventions for sepsis is fluid therapy. Whether or not fluid bolus affects the microcirculation in sepsis has not been fully addressed in the literature. This systematic review of the evidence aims to collate studies examining the microcirculatory outcomes after a fluid bolus in patients with sepsis. We will assimilate the evidence for using handheld intra vital microscopes to guide fluid resuscitation and the effect of fluid bolus on the sublingual microcirculation in patients with sepsis and septic shock. We conducted a systematic search of Embase, CENTRAL and Medline (PubMed) using combinations of the terms “microcirculation” AND “fluid” OR “fluid resuscitation” OR “fluid bolus” AND “sepsis” OR “septic shock”. We found 3376 potentially relevant studies. Fifteen studies published between 2007 and 2021 fulfilled eligibility criteria to be included in analysis. The total number of participants was 813; we included six randomized controlled trials and nine non-randomized, prospective observational studies. Ninety percent used Sidestream Dark Field microscopy to examine the microcirculation and 50% used Hydroxyethyl Starch as their resuscitation fluid. There were no clear effects of fluid on the microcirculation parameters. There was too much heterogeneity between studies and methodology to perform meta-analysis. Studies identified heterogeneity of affect in the sepsis population, which could mean that current clinical classifications were not able to identify different microcirculation characteristics. Use of microcirculation as a clinical endpoint in sepsis could help to define sepsis phenotypes. More research into the effects of different resuscitation fluids on the microcirculation is needed.

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Bagheri, Sina, Saeed Tavangar Roosta und Amir Heidari. „Viscous Heating Effects on Heat Transfer Characteristics of an Explosive Fluid in a Converging Pipe“. Periodica Polytechnica Mechanical Engineering 64, Nr. 3 (11.06.2020): 240–47. http://dx.doi.org/10.3311/ppme.16085.

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Viscous dissipation is the production of heat due to the slip of fluid layers and can raise the temperature of the fluid that is affected by high shear stresses. This raise of temperature in fluids with explosive properties can cause the explosion during the processing. The present paper investigates the temperature distribution of an explosive fluid beside the wall of a converging tube. This study has been done by using the computational fluid dynamics and OpenFOAM software. The studied cases contain the fluid with two viscosities (50 and 500 kg/m × s) and two inlet conditions (constant and developed velocity profile). The results of this study show that at the end of a converging pipe, duo to the viscous dissipation effects, the temperature rise for high viscosity fluid is more intensive and this is a dangerous fact for high viscosity explosive fluids discharging. Also, it has been considered that the constant inlet velocity is safer in comparison with the developed profile, as the slope of temperature rise is less.

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Rice, GE, MH Wong, P. Christensen, V. Dantzer und E. Skadhauge. „Gestational profile of the stimulatory effects of porcine amniotic and allantoic fluids on prostaglandin G/H synthase activity“. Reproduction, Fertility and Development 2, Nr. 5 (1990): 581. http://dx.doi.org/10.1071/rd9900581.

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The effects of porcine fetal fluids (amniotic and allantoic) on microsomal prostaglandin G/H synthase (PGHS) activity were assessed. Both amniotic and allantoic fluids obtained from late-gestation sows stimulated PGHS activity (as indicated by increased formation of radiolabelled prostaglandin) in a dose-dependent manner. At the maximum dose tested, amniotic and allantoic fluids stimulated prostaglandin (PG) formation by 55.5 +/- 1.5 and 58.5 +/- 4.7%, respectively (n = 3, P less than 0.01). Based upon ED50 values, amniotic fluid was approximately threefold more effective than allantoic fluid in stimulating PG formation. The stimulatory effect of amniotic but not allantoic fluid increased significantly (P less than 0.01) during gestation (Days 47-112). The observed changes in the stimulatory effect of amniotic fluid on microsomal PG formation parallels the in vivo changes that occur in intra-uterine PG synthesis. Amniotic fluid stimulatory activity may contribute to this gestational increase in PG synthesis.

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Hsu, C. H., S. Y. Hu, K. Y. Kung, C. C. Kuo und C. C. Chang. „A Study on the Flow Patterns of a Second Grade Viscoe-Lastic Fluid Past a Cavity in a Horizontal Channel“. Journal of Mechanics 29, Nr. 2 (20.12.2012): 207–15. http://dx.doi.org/10.1017/jmech.2012.143.

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AbstractThis paper studies the behavior of second grade viscoelastic fluid past a cavity in a horizontal channel. The effects of Reynolds number, fluid elasticity and the aspect ratio of the cavity on the flow field are simulated numerically. The equations are converted into the vorticity and stream function equations. The solution is obtained by the finite difference method.The behavior of viscoelastic fluids is quite different from the Newtonian fluid, due to the effects of fluid elasticity. Only one flow pattern appears when the Newtonian fluid past the cavity. However, three kinds of flow patterns appear while the viscoelastic fluids past the cavity by increasing Reynolds number from 20 to 300. The flow field is affected by the fluid elasticity as well as the aspect ratio of the cavity. The transitional flow pattern appears at lower Reynolds number as the higher elasticity fluid past the cavity with larger aspect ratio.

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Углев, Николай, und Сергей Углев. „INTRICATE EFFECTS OF SIMPLE FLUID“. PNRPU Bulletin. Chemical Technology and Biotechnology, Nr. 3 (30.09.2019): 96–108. http://dx.doi.org/10.15593/2224-9400/2019.3.09.

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Krane, Michael. „Fluid dynamic effects in speech“. Journal of the Acoustical Society of America 105, Nr. 2 (Februar 1999): 1159. http://dx.doi.org/10.1121/1.425507.

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G. Berryman, James. „Electrokinetic effects and fluid permeability“. Physica B: Condensed Matter 338, Nr. 1-4 (Oktober 2003): 270–73. http://dx.doi.org/10.1016/j.physb.2003.08.006.

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Honda, M., und K. Mima. „Fluid effects on inverse bremsstrahlung“. Plasma Physics and Controlled Fusion 40, Nr. 11 (01.11.1998): 1887–95. http://dx.doi.org/10.1088/0741-3335/40/11/005.

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Taketomi, Susamu, Masakazu Ukita, Masaki Mizukami, Hideki Miyajima und Soshin Chikazumi. „Magnetooptical Effects of Magnetic Fluid“. Journal of the Physical Society of Japan 56, Nr. 9 (September 1987): 3362–74. http://dx.doi.org/10.1143/jpsj.56.3362.

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Yamamoto, Takahiro, und Mitsuhiro Matsumoto. „Solute effects on supercritical fluid“. Molecular Simulation 37, Nr. 13 (November 2011): 1091–96. http://dx.doi.org/10.1080/08927022.2011.582104.

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Varrier, Matt, und Marlies Ostermann. „Fluid Composition and Clinical Effects“. Critical Care Clinics 31, Nr. 4 (Oktober 2015): 823–37. http://dx.doi.org/10.1016/j.ccc.2015.06.014.

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Candler, Graham V. „Rate Effects in Hypersonic Flows“. Annual Review of Fluid Mechanics 51, Nr. 1 (05.01.2019): 379–402. http://dx.doi.org/10.1146/annurev-fluid-010518-040258.

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Hypersonic flows are energetic and result in regions of high temperature, causing internal energy excitation, chemical reactions, ionization, and gas-surface interactions. At typical flight conditions, the rates of these processes are often similar to the rate of fluid motion. Thus, the gas state is out of local thermodynamic equilibrium and must be described by conservation equations for the internal energy and chemical state. Examples illustrate how competition between rates in hypersonic flows can affect aerodynamic performance, convective heating, boundary layer transition, and ablation. The conservation equations are outlined, and the most widely used models for internal energy relaxation, reaction rates, and transport properties are reviewed. Gas-surface boundary conditions are described, including finite-rate catalysis and slip effects. Recent progress in the use of first-principles calculations to understand and quantify critical gas-phase reactions is discussed. An advanced finite-rate carbon ablation model is introduced and is used to illustrate the role of rate processes at hypersonic conditions.

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Stenvall, C. A., A. Fagereng, J. F. A. Diener, C. Harris und P. E. Janney. „Sources and Effects of Fluids in Continental Retrograde Shear Zones: Insights from the Kuckaus Mylonite Zone, Namibia“. Geofluids 2020 (01.08.2020): 1–21. http://dx.doi.org/10.1155/2020/3023268.

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Midcrustal rocks in retrograde metamorphic settings are typically H2O-undersaturated and fluid-absent and have low permeability. Exhumed continental retrograde faults, nonetheless, show evidence for the operation of fluid-mediated weakening mechanisms during deformation at midcrustal conditions. To explore the origin and effects of fluids in retrograde faults, we study the Kuckaus Mylonite Zone (KMZ), an exhumed crustal-scale, strike-slip shear zone in the southern Namibian Namaqua Metamorphic Complex. The KMZ deformed quartzofeldspathic migmatised gneisses at midcrustal retrograde conditions (450-480°C, 270-420 MPa) in the Mesoproterozoic, 40 Ma after granulite facies peak metamorphism at 825°C and 550 MPa. The mylonites contain fully hydrated retrograde mineral assemblages, predominantly adjacent to anastomosing high-strain zones, providing evidence of local H2O saturation and fluid presence during deformation. Whole rock and quartz vein δ18O values suggest that at least some of the fluids were meteoric in origin. The rocks across the shear zone retain the effect of different protoliths, implying little effect of fluid-rock interaction on whole rock major element chemistry. Together with a general scarcity of quartz veins, this suggests that fluid/rock ratios remained low in the KMZ. However, even small amounts of H2O allowed reaction weakening and diffusion-precipitation, followed by growth and alignment of phyllosilicates. In the ultramylonites, a fine grain size in the presence of fluids allowed for grain size sensitive creep. We conclude that the influx of even small volumes of fluids into retrograde shear zones can induce drastic weakening by facilitating grain size sensitive creep and retrograde reactions. In retrograde settings, these reactions consume fluids, and therefore elevated fluid pressures will only be possible after considerable weakening has already occurred. Our findings imply that the range of seismic styles recently documented at active retrograde transform faults may not require high fluid pressures but could also arise from other local weakening mechanisms.

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Li, Shengjie. „Effects of fluid saturations on undrained poroelastic constants in layered media“. Geophysical Journal International 223, Nr. 1 (23.06.2020): 366–78. http://dx.doi.org/10.1093/gji/ggaa311.

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SUMMARY Understanding the fluid dependence of the poroelastic stiffness constants of a layered porous package is of great importance in subsurface exploration and development. While the effects of the pore-fluid distribution caused by coarse-scale heterogeneities within an isotropic medium have been studied for several decades, the role of these heterogeneities on the poroelastic constants of a finely layered package is still largely unexplored. In this study, we apply the poroelastic upscaling methods to estimate the fluid-dependent poroelastic stiffness constants of a layered package at the coarse scale. The numerical results show that the refined Gassmann's fluid substitution formulae presented in this paper is applicable if a single fluid phase is uniformly saturated within a layered package. The stiffness constants (${c_{11}}$ and ${c_{33}}$) of the layered package with patchy saturations are always higher than or equal to those obtained for the medium with homogeneous saturations, the stiffness constants predicted by the refined fluid substitution formulae for the package simultaneously saturated with different fluids fall between them. Experimental results confirm the relationship between the undrained vertical stiffness constant and the effective pore-fluid bulk modulus for the patch saturated package, indicating that a reasonable result can be achieved by properly choosing an effective poroelastic model that accounts both for the fluid hydraulic communication and the anisotropy of the medium. The results improve the understanding of the coarse-scale fluid dependence of the poroelastic stiffness constants of a layered package, and therefore, it can be used to interpret the seismically inverted elastic parameter for the petrophysical properties in heterogeneous reservoirs.

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Apparao, Siddangouda, Trimbak Vaijanath Biradar und Neminath Bhujappa Naduvinamani. „Non-Newtonian Effects of Second-Order Fluids on the Hydrodynamic Lubrication of Inclined Slider Bearings“. International Scholarly Research Notices 2014 (23.10.2014): 1–7. http://dx.doi.org/10.1155/2014/787304.

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Theoretical study of non-Newtonian effects of second-order fluids on the performance characteristics of inclined slider bearings is presented. An approximate method is used for the solution of the highly nonlinear momentum equations for the second-order fluids. The closed form expressions for the fluid film pressure, load carrying capacity, frictional force, coefficient of friction, and centre of pressure are obtained. The non-Newtonian second order fluid model increases the film pressure, load carrying capacity, and frictional force whereas the center of pressure slightly shifts towards exit region. Further, the frictional coefficient decreases with an increase in the bearing velocity as expected for an ideal fluid.

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Chen, Haodong, Ming Luo, Wandong Zhang, Cheng Han und Peng Xu. „Ultra-Low-Density Drilling Fluids for Low-Pressure Coefficient Formations: Synergistic Effects of Surfactants and Hollow Glass Microspheres“. Processes 11, Nr. 7 (17.07.2023): 2129. http://dx.doi.org/10.3390/pr11072129.

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With the increase in drilling fluid density requirements in low-pressure coefficient formations, traditional hollow bead drilling fluids and foam drilling fluids each have different degrees of deficiencies. Through extensive indoor experiments, an amphoteric surfactant (cocoamidopropyl betaine) with better foaming performance was selected to formulate an ultra-low-density drilling fluid that combines a foaming agent and hollow glass microbeads to reduce the density of the fluid, with the following specific formulation: 3% bentonite slurry + 0.3% xanthan gum + 0.5% carboxymethyl cellulose + 0.5% starch + 2% lignite resin + 2% blocking agent + 4% hollow glass microspheres + 0.5% foaming agent + 2% nano blocking agent. The performance of the system was evaluated, and the results showed that: the density of the ultra-low-density drilling fluid did not change much before and after aging at 80 °C and was relatively stable; the filter loss amount of the drilling fluid (tested by API) reached 4.6 mL, which meets the requirements for filter loss of drilling fluid; it can bear the pressure of 12 MPa under a 60–90-mesh sand bed and has better pressure sealing capability than hollow glass microbead drilling fluid.

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Haider, Sajjad, Adnan Saeed Butt, Imran Syed Muhammad, Asif Ali, Yun-Zhang Li, Syed Muhammad Ali Naqvi und Muhammad Adnan Qaiser. „Impact of nano-particles shapes on Al2O3-water nano-fluid flow due to a stretching cylinder“. International Journal of Numerical Methods for Heat & Fluid Flow 30, Nr. 5 (19.08.2019): 2809–32. http://dx.doi.org/10.1108/hff-02-2019-0113.

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Purpose The purpose of this study is to theoretically probe the shape impacts of nano-particle on boundary layer flow of nano-fluid toward a stretching cylinder with heat-transmission effects. The base fluid used for this study is pure water, and aluminum oxide nano-particles are suspended in it. Four different shapes of nano-particle, namely, cylindrical, brick, platelets and blades, are considered to carry out the study. Design/methodology/approach The problem is modelled mathematically and the nonlinear system of equations is attained by using appropriate transmutations. The solution of transmuted equations is achieved by utilizing a shooting technique with Fourth-Fifth order Runge–Kutta Fehlberg scheme. Numerically attained results are elucidated through graphs and tables which are further compared under limiting cases with existing literature to check the validity of the results. Findings It is observed that fluid velocity and temperature of cylindrical shaped water nano-fluids are more than the nano-fluid having brick-shaped nano-particles. Moreover, it is seen that the nano-fluids suspended with platelets-shaped nano-particles have higher velocity and temperature than the nano-fluids containing blade-shaped nano-particles. The curvature parameter and nano-particles volume fraction have increasing effects on flow velocity and temperature of nano-fluids containing all types of nano-particle shapes. Originality/value Numerous authors have examined the impacts of nano-particle shapes on characteristics of heat transfer and fluid flow. However, to the best of the authors’ knowledge, the shape impacts of nano-particles on boundary layer flow of nano-fluid toward a stretching cylinder with heat-transmission effects have not been discussed. So, to fulfill this gap, the present paper explicates the impacts of various nano-particle shapes on Al2O3–water-based nano-fluid flow past a stretching cylinder with heat-transfer effects.

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Yuan, Chao, Hong-Na Zhang, Yu-Ke Li, Xiao-Bin Li, Jian Wu und Feng-Chen Li. „Nonlinear effects of viscoelastic fluid flows and applications in microfluidics: A review“. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234, Nr. 22 (07.05.2020): 4390–414. http://dx.doi.org/10.1177/0954406220922863.

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Viscoelastic fluid naturally has both viscous and elastic properties. Therefore, there are two sources of nonlinear effects, namely inertial and elastic nonlinearities. The existence of elastic nonlinearity brings about various interesting flow phenomena in viscoelastic fluid flow, especially in microfluidics where the inertial nonlinearity can be negligible while the elastic nonlinearity can dominate the flow. Specifically, purely elasticity-induced instability and turbulence can occur in microchannels when the elastic nonlinearity is strong enough. Recently, those intriguing properties of viscoelastic fluid flow have motivated lots of researches on taking viscoelastic fluid as working fluid in different types of microfluidic devices, such as micro-mixers, micro heat exchangers, logic microfluidic circuits and particle manipulation. This paper aims to provide a state-of-the-art review of the nonlinear effect of viscoelastic fluids and its applications in the aforementioned microfluidic fields, which may provide a useful guidance for the researchers who are interested in this area.

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Santos, Juan, José Carcione und Jing Ba. „Two-Phase Flow Effects on Seismic Wave Anelasticity in Anisotropic Poroelastic Media“. Energies 14, Nr. 20 (12.10.2021): 6528. http://dx.doi.org/10.3390/en14206528.

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We study the wave anelasticity (attenuation and velocity dispersion) of a periodic set of three flat porous layers saturated by two immiscible fluids. The fluids are very dissimilar in properties, namely gas, oil, and water, and, at most, three layers are required to study the problem from a general point of view. The sequence behaves as viscoelastic and transversely isotropic (VTI) at wavelengths much longer than the spatial period. Wave propagation causes fluid flow and slow P modes, inducing anelasticity. The fluids are characterized by capillary forces and relative permeabilities, which allow for the existence of two slow modes and the presence of dissipation, respectively. The methodology to study the physics is based on a finite-element uspcaling approach to compute the complex and frequency-dependent stiffnesses of the effective VTI medium. The results of the experiments indicate that there is higher dissipation and anisotropy compared to the widely used model based on an effective fluid that ignores the effects of surface tension (capillarity) and viscous flow interference between the two fluid phases.

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Procopio, Giuseppe, und Massimiliano Giona. „Modal Representation of Inertial Effects in Fluid–Particle Interactions and the Regularity of the Memory Kernels“. Fluids 8, Nr. 3 (28.02.2023): 84. http://dx.doi.org/10.3390/fluids8030084.

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This article develops a modal expansion (in terms of functions exponentially decaying with time) of the force acting on a micrometric particle and stemming from fluid inertial effects (usually referred to as the Basset force) deriving from the application of the time-dependent Stokes equation to model fluid–particle interactions. One of the main results is that viscoelastic effects induce the regularization of the inertial memory kernels at t=0, eliminating the 1/t-singularity characterizing Newtonian fluids. The physical origin of this regularization stems from the finite propagation velocity of the internal shear stresses characterizing viscoelastic constitutive equations. The analytical expression for the fluid inertial kernel is derived for a Maxwell fluid, and a general method is proposed to obtain accurate approximations of it for generic complex viscoelastic fluids, characterized by a spectrum of relaxation times.

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Ingelse, Sarah A., Marloes M. IJland, Lex M. van Loon, Reinout A. Bem, Job B. M. van Woensel und Joris Lemson. „Early restrictive fluid resuscitation has no clinical advantage in experimental severe pediatric acute respiratory distress syndrome“. American Journal of Physiology-Lung Cellular and Molecular Physiology 320, Nr. 6 (01.06.2021): L1126—L1136. http://dx.doi.org/10.1152/ajplung.00613.2020.

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Intravenous fluids are widely used to treat circulatory deterioration in pediatric acute respiratory distress syndrome (PARDS). However, the accumulation of fluids in the first days of PARDS is associated with adverse outcome. As such, early fluid restriction may prove beneficial, yet the effects of such a fluid strategy on the cardiopulmonary physiology in PARDS are unclear. In this study, we compared the effect of a restrictive with a liberal fluid strategy on a hemodynamic response and the formation of pulmonary edema in an animal model of PARDS. Sixteen mechanically ventilated lambs (2–6 wk) received oleic acid infusion to induce PARDS and were randomized to a restrictive or liberal fluid strategy during a 6-h period of mechanical ventilation. Transpulmonary thermodilution determined extravascular lung water (EVLW) and cardiac output (CO). Postmortem lung wet-to-dry weight ratios were obtained by gravimetry. Restricting fluids significantly reduced fluid intake but increased the use of vasopressors among animals with PARDS. Arterial blood pressure was similar between groups, yet CO declined significantly in animals receiving restrictive fluids ( P = 0.005). There was no difference in EVLW over time ( P = 0.111) and lung wet-to-dry weight ratio [6.1, interquartile range (IQR) = 6.0–7.3 vs. 7.1, IQR = 6.6–9.4, restrictive vs. liberal, P = 0.725] between fluid strategies. Both fluid strategies stabilized blood pressure in this model, yet early fluid restriction abated CO. Early fluid restriction did not limit the formation of pulmonary edema; therefore, this study suggests that in the early phase of PARDS, a restrictive fluid strategy is not beneficial in terms of immediate cardiopulmonary effects.

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Zare, M., A. Roustaei, K. Alba und I. A. Frigaard. „Invasion of fluids into a gelled fluid column: Yield stress effects“. Journal of Non-Newtonian Fluid Mechanics 238 (Dezember 2016): 212–23. http://dx.doi.org/10.1016/j.jnnfm.2016.06.002.

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RezaGholilou, Alireza, Hossien Salemi, Nathan Tarom, Pouria Behnoudfar und Mohammad Sarmadivaleh. „Experimental investigation of fluid thermal effects on fracture brittleness“. APPEA Journal 59, Nr. 1 (2019): 457. http://dx.doi.org/10.1071/aj18269.

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Fracture extent and formation quality are the key parameters affecting hydraulic fracturing results. Fracture brittleness, initiation and propagation are dominantly ruled by in situ stresses and rock mechanical properties which cannot be manipulated. However, operation parameters such as injection rate, viscosity and temperature of fluid can be adjusted for fracturing treatments. This paper focuses on a thermal treatment approach that affects brittleness. We investigated fractures when fluid temperature is lower than formation. Experiments were conducted using synthetic 50-mm cubic samples in a newly built true triaxial stress cell. This cell was fitted with cooling and heating auxiliary apparatus which enabled injection of fluids of various temperatures in the presence of orthogonal stresses. The samples and test records are evaluated in details to develop and upscale the results for real applications such as tight shale gas formations. Findings indicate that brittleness of material increases when considerable temperature differences exist between rock and injection fluid.

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Moukhametov, Robert, Anurag Srivastava, Syeda Akhter, Jerahmeel Bautista, Hicham Ferroudji, Hassan Hadear, Ibrahim Hassan und Mohammad Azizur Rahman. „Effects of salinity on solid particle settling velocity in non-Newtonian Herschel–Bulkley fluids“. Journal of Petroleum Exploration and Production Technology 11, Nr. 8 (25.06.2021): 3333–47. http://dx.doi.org/10.1007/s13202-021-01220-3.

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AbstractSettling velocity or depositional velocity is considered a key parameter to account for in the drilling technology of oil and gas wells as well as hydrocarbon processing since an accurate estimation of this parameter allows the transport of cuttings efficiently, avoids non-productive time, and helps avoid costly problems. Understanding the settling velocity in fluid with high salinity will help for the better separation of oil and natural gas streams in processing facilities. Although a great amount of effort was given to rheology and settling velocity measurements for power-law fluid and Bingham fluids, there are limited studies available in the literature for Herschel–Bulkley (H–B) fluid with salinity. The present study analyzes the fluid rheology of non-Newtonian fluids with, and without, salinity. Moreover, experiments have been conducted to measure the settling velocity of different diameters of solid particles through Herschel–Bulkley fluids with various salinity conditions. For the rheology analysis, it is found that higher weight percentages of NaCl lead to low values of shear stresses. As well, higher weight percentages of CaCl2 concentration result in a slight increase in shear stresses per a given shear rate. On the other hand, higher percentages of salt concentration cause an increase in the terminal velocity.

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Wu, Zhangming, und Xianghong Ma. „Dynamic analysis of submerged microscale plates: the effects of acoustic radiation and viscous dissipation“. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 472, Nr. 2187 (März 2016): 20150728. http://dx.doi.org/10.1098/rspa.2015.0728.

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The aim of this paper is to study the dynamic characteristics of micromechanical rectangular plates used as sensing elements in a viscous compressible fluid. A novel modelling procedure for the plate–fluid interaction problem is developed on the basis of linearized Navier–Stokes equations and no-slip conditions. Analytical expression for the fluid-loading impedance is obtained using a double Fourier transform approach. This modelling work provides us an analytical means to study the effects of inertial loading, acoustic radiation and viscous dissipation of the fluid acting on the vibration of microplates. The numerical simulation is conducted on microplates with different boundary conditions and fluids with different viscosities. The simulation results reveal that the acoustic radiation dominates the damping mechanism of the submerged microplates. It is also proved that microplates offer better sensitivities (Q-factors) than the conventional beam type microcantilevers being mass sensing platforms in a viscous fluid environment. The frequency response features of microplates under highly viscous fluid loading are studied using the present model. The dynamics of the microplates with all edges clamped are less influenced by the highly viscous dissipation of the fluid than the microplates with other types of boundary conditions.

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Sadaf, Hina, Adnan Kiani und Nazir Ahmad Mir. „Mixed convection analysis of cilia-driven flow of a Jeffrey fluid in a vertical tube“. Canadian Journal of Physics 98, Nr. 2 (Februar 2020): 111–18. http://dx.doi.org/10.1139/cjp-2018-0753.

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In this article, effects of cilia-driven flow of a Jeffrey fluid in a vertical tube are discussed. Mixed convection effects are also considered. Jeffrey fluid equations are simplified by the well-known assumptions of small Reynolds number and large wavelength. An exact solution has been managed for the simplified equations. The ciliated motion features are investigated by plots and are discussed in detail. The consequences show that the pumping machinery functions more competently drive forward Jeffrey fluid than Newtonian fluid. The results may help us better understand the transportation of bio-fluids in the human body.

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Böse, H. „Investigations on Zeolite-Based ER Fluids Supported by Experimental Design“. International Journal of Modern Physics B 13, Nr. 14n16 (30.06.1999): 1878–85. http://dx.doi.org/10.1142/s0217979299001910.

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The application of experimental design for determining the influence of various parameters on rheological properties of electrorheological (ER) fluids is demonstrated. Such statistical methods allow the quantitative determination of parameter effects even in the presence of considerable property fluctuations of the ER fluid as well as the calculation of interactions between the parameter effects. They thus provide a powerful optimization tool. Investigations have been performed on ER fluids containing particles of zeolite A in silicone oil. The influence of zeolite content, oil viscosity, particle size, cation composition and ER fluid temperature on the viscosity of ER fluids with and without electric field has been studied. In addition to the main effects of the parameters interactions between them also play a considerable role. The ratio of ER fluid viscosities with and without field, respectively, decreases with rising oil viscosity and increases with temperature. The larger value of the ratio for ER fluids with smaller particles is referred to different particle structures. Results of parameter effects on viscosity of the ER fluid in electric fields depend on the shear rate. Cation exchange of sodium to potassium has only a minor influence on ER activity. This result is compared with cation exchange with calcium, by which ER activity is drastically diminished. The loss of activity can be related to the occupation of different cation sites in zeolite A.

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Li, Meng-Ge, Feng Feng, Wei-Tao Wu und Mehrdad Massoudi. „Numerical Simulations of the Flow of a Dense Suspension Exhibiting Yield-Stress and Shear-Thinning Effects“. Energies 13, Nr. 24 (16.12.2020): 6635. http://dx.doi.org/10.3390/en13246635.

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Many types of dense suspensions are complex materials exhibiting both solid-like and fluid-like behavior. These suspensions are usually considered to behave as non-Newtonian fluids and the rheological characteristics such as yield stress, thixotropy and shear-thinning/thickening can have significant impact on the flow and the engineering applications of these materials. Therefore, it is important to understand the rheological features of these fluids. In this paper, we study the flow of a nonlinear fluid which exhibits yield stress and shear-thinning effects. The geometries of interests are a straight channel, a channel with a crevice and a pipe with a contraction; we assume the fluid behaves as a Herschel-Bulkley fluid. The numerical simulations indicate that for flows with low Reynolds number and high Bingham number an unyielded plug may form in the center of the channel. In the case of a channel with a crevice, the fluid in the deep portion of the crevice is at an extremely high level of viscosity, forming a plug which is hard to yield. For the pipe with a contraction, near the pipe neck the unyielded region is smaller due to the enhanced flow disturbance.

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Awati, Vishwanath B., Krishna B. Chavaraddi und Priya M. Gouder. „Effect of boundary roughness on nonlinear saturation of Rayleigh-Taylor instability in couple-stress fluid“. Nonlinear Engineering 8, Nr. 1 (28.01.2019): 39–45. http://dx.doi.org/10.1515/nleng-2018-0031.

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Abstract The boundary roughness effects on nonlinear saturation of Rayleigh-Taylor instability (RTI) in couple-stress fluid have been studied using numerical technique on the basis of stability of interface between two fluids of the system. The resulting fourth order ordinary nonlinear differential equation is solved using Adams-Bashforth predictor and Adams-Moulton corrector techniques numerically. The various surface roughness effects and surface tension effects on nonlinear saturation of RTI of two superposed couple-stress fluid and fluid saturated porous media are well investigated. At the interface, the surface tension acts and finally stability of the problem is discussed in detail.

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Ait Abderrahmane, Hamid, Shahid Rabbani und Mohamed Sassi. „Inertia Effects in the Dynamics of Viscous Fingering of Miscible Fluids in Porous Media: Circular Hele-Shaw Cell Configuration“. Energies 14, Nr. 19 (08.10.2021): 6432. http://dx.doi.org/10.3390/en14196432.

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We present a numerical study of viscous fingering occurring during the displacement of a high viscosity fluid by low viscosity fluid in a circular Hele-Shaw cell. This study assumes that the fluids are miscible and considers the effects of inertial forces on fingering morphology, mixing, and displacement efficiency. This study shows that inertia has stabilizing effects on the fingering instability and improves the displacement efficiency at a high log-mobility-viscosity ratio between displacing and displaced fluids. Under certain conditions, inertia slightly reduces the finger-split phenomenon and the mixing between the two fluids.

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Sharif, M., und M. Zaeem Ul Haq Bhatti. „Effects of some physical factors on the inhomogeneity in planar symmetry“. Modern Physics Letters A 29, Nr. 18 (04.06.2014): 1450094. http://dx.doi.org/10.1142/s0217732314500941.

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This paper is devoted to identify some physical causes of energy density inhomogeneity and stability of self-gravitating relativistic fluids in plane symmetry such as Weyl tensor, local anisotropy, dissipative terms and their specific combination. We first develop a relationship between matter variables and the Weyl tensor and then formulate dynamical equations using Bianchi identities. For the non-dissipative dust fluid, we conclude that the system will remain homogeneous if and only if it is conformally flat which implies the shear-free condition. However, the converse is not true for the non-dissipative isotropic fluid. For non-dissipative anisotropic fluid, the inhomogeneity factor is identified to be one of the structure scalars. A particular case of geodesic with dissipation is also discussed.

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Nishikawa, H., K. Ueda, M. Kaneta, J. Wang und P. Yang. „Effects of longitudinal roughness on fluid temperature in point elastohydrodynamic lubrication contacts“. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 221, Nr. 7 (01.07.2007): 793–99. http://dx.doi.org/10.1243/13506501jet300.

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The effects of longitudinal surface roughness on the oil film temperature are studied numerically based on Eyring and Newtonian fluid flow models under point contact rolling and sliding elastohydrodynamic lubrication (EHL) conditions. There is a significant difference in oil film temperature distribution between the Eyring or shear thinning fluid and the Newtonian fluid. In shear thinning fluids, the relationship between the oil film temperature distribution and the roughness around the central contact area becomes out-of-phase, i.e. the temperature of oil film is higher at the valley than at the ridge of asperity. Such a phenomenon occurs easily under short wavelength and low amplitude of roughness, and moderate entrainment velocities depending on the slide-roll ratio.

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Wu, Huawei, Peyman Torkian, Amir Zarei, Iman Moradi, Arash Karimipour und Masoud Afrand. „Hydrodynamic and thermal flow in nanochannel to study effects of roughness by estimation the atoms positions via MD method“. International Journal of Numerical Methods for Heat & Fluid Flow 30, Nr. 1 (18.11.2019): 452–67. http://dx.doi.org/10.1108/hff-09-2019-0711.

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Purpose This paper aims to investigate atoms type and channel roughness effects on fluid behavior in nanochannel. Design/methodology/approach The results of mechanical properties of these structures are reported in this work by using molecular dynamics method. Findings The results show that nanochannel roughness is a limiting factor in flowing fluid in nanochannel. Moreover, fluids with less atomic weight have more free movement in ideal and non-ideal nanochannels. Originality/value For the study of mechanical properties of fluid/nanochannel system, the authors calculated parameters such as potential energy, density, temperature and velocity profiles of simulated fluids.

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