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Journal articles on the topic 'Fluid behavior'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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1

Yasappan, Justine, Ángela Jiménez-Casas, and 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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2

Azuma, Hisao. "Fluid Behavior in Microgvavity." Journal of the Society of Mechanical Engineers 97, no. 910 (1994): 764–66. http://dx.doi.org/10.1299/jsmemag.97.910_764.

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3

ROSENFELD, NICHOLAS, NORMAN M. WERELEY, RADHAKUMAR RADAKRISHNAN, and TIRULAI S. SUDARSHAN. "BEHAVIOR OF MAGNETORHEOLOGICAL FLUIDS UTILIZING NANOPOWDER IRON." International Journal of Modern Physics B 16, no. 17n18 (July 20, 2002): 2392–98. http://dx.doi.org/10.1142/s0217979202012414.

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Iron nanopowders for use in magnetorheological (MR) fluids were synthesized using a Microwave Plasma Synthesis technique developed at Materials Modification Inc (Fairfax VA). Transmission electron microscopy and surface area analysis measured iron particle size at 15–25 nm. The nanopowders were mixed into hydraulic oil to create nano-scale MR fluid. A micro-scale fluid was created using 45 μm iron particles as well as a hybrid fluid using a 50/50 mix of micro- and nanoparticles. All three fluids had a solids loading of 60% (w/w or weight by weight fraction). The fluids were tested in a flow mode rheometer fabricated from a modified damper using a sinusoidal input dynamometer over a speed range of 12.7 to 177.8 mm/s (0.5 to 6 in/s) and an input current range of 0 to 2 A. The yield stress and plastic viscosity of the MR fluid were characterized using a Bingham plastic model.

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4

Skadsem, Hans Joakim, Amare Leulseged, and Eric Cayeux. "Measurement of Drilling Fluid Rheology and Modeling of Thixotropic Behavior." Applied Rheology 29, no. 1 (March 1, 2019): 1–11. http://dx.doi.org/10.1515/arh-2019-0001.

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Abstract Drilling fluids perform a number of important functions during a drilling operation, including that of lifting drilled cuttings to the surface and balancing formation pressures. Drilling fluids are usually designed to be structured fluids exhibiting shear thinning and yield stress behavior, and most drilling fluids also exhibit thixotropy. Accurate modeling of drilling fluid rheology is necessary for predicting friction pressure losses in the wellbore while circulating, the pump pressure needed to resume circulation after a static period, and how the fluid rheology evolves with time while in static or near-static conditions. Although modeling the flow of thixotropic fluids in realistic geometries is still a formidable future challenge to be solved, considerable insights can still be gained by studying the viscometric flows of such fluids. We report a detailed rheological characterization of a water-based drilling fluid and an invert emulsion oilbased drilling fluid. The micro structure responsible for thixotropy is different in these fluids which results in different thixotropic responses. Measurements are primarily focused at transient responses to step changes in shear rate, but cover also steady state flow curves and stress overshoots during start-up of flow. We analyze the shear rate step change measurements using a structural kinetics thixotropy model.

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5

Bayatian, Majid, Mohammad Reza Ashouri, and Rouhallah Mahmoudkhani. "Flow Behavior Simulation with Computational Fluid Dynamics in Spray Tower Scrubber." International Journal of Environmental Science and Development 7, no. 3 (2016): 181–84. http://dx.doi.org/10.7763/ijesd.2016.v7.764.

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6

Chen, Dilin, Jie Li, Haiwen Chen, Lai Zhang, Hongna Zhang, and Yu Ma. "Electroosmotic Flow Behavior of Viscoelastic LPTT Fluid in a Microchannel." Micromachines 10, no. 12 (December 15, 2019): 881. http://dx.doi.org/10.3390/mi10120881.

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In many research works, the fluid medium in electroosmosis is considered to be a Newtonian fluid, while the polymer solutions and biological fluids used in biomedical fields mostly belong to the non-Newtonian category. Based on the finite volume method (FVM), the electroosmotic flow (EOF) of viscoelastic fluids in near-neutral (pH = 7.5) solution considering four ions (K+, Cl−, H+, OH−) is numerically studied, as well as the viscoelastic fluids’ flow characteristics in a microchannel described by the Linear Phan-Thien–Tanner (LPTT) constitutive model under different conditions, including the electrical double layer (EDL) thickness, the Weissenberg number (Wi), the viscosity ratio and the polymer extensibility parameters. When the EDL does not overlap, the velocity profiles for both Newtonian and viscoelastic fluids are plug-like and increase sharply near the charged wall. Compared with Newtonian fluid at Wi = 3, the viscoelastic fluid velocity increases by 5 times and 9 times, respectively, under the EDL conditions of kH = 15 and kH = 250, indicating the shear thinning behavior of LPTT fluid. Shear stress obviously depends on the viscosity ratio and different Wi number conditions. The EOF is also enhanced by the increase (decrease) in polymer extensibility parameters (viscosity ratio). When the extensibility parameters are large, the contribution to velocity is gradually weakened.

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7

HU, WEI, and NORMAN M. WERELEY. "BEHAVIOR OF MR FLUIDS AT HIGH SHEAR RATE." International Journal of Modern Physics B 25, no. 07 (March 20, 2011): 979–85. http://dx.doi.org/10.1142/s0217979211058535.

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The high shear rate behavior of MR fluids is investigated using a concentric rotational cylinder viscometer fabricated in-house. The rotational cylinder viscometer is designed such that a high shear rate of up to 30,000 s-1 can be applied to the MR fluid in a pure shear flow mode. As a comparison, the maximum shear rate of a commercially available parallel disk type rheometer is only up to 1,000 s-1. To determine the shear rate of the MR fluid in the viscometer, an exact expression between torque and angular velocity is established. The yield stress and viscosity of the MR fluid is determined by fitting the expression into the measured torque and angular velocities, and the shear stress as a function of the shear rate is further derived. The magnetic filed strength across the fluid gap is determined based on an electromagnetic field analysis, and the yield stress and viscosity of the fluid as a function of the magnetic filed is established. Specifically, the stability of the MR fluid at high shear rate is also evaluated. Two commercially available MR fluids, i.e., Lord's MRF-132DG and MRF-140CG, are investigated using the rotational cylinder viscometer, and the testing results are compared to the manufacturer's data.

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8

Papautsky, Ian, John Brazzle, Timothy Ameel, and A. Bruno Frazier. "Laminar fluid behavior in microchannels using micropolar fluid theory." Sensors and Actuators A: Physical 73, no. 1-2 (March 1999): 101–8. http://dx.doi.org/10.1016/s0924-4247(98)00261-1.

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9

Hou, Chien-Yuan. "Fluid Dynamics and Behavior of Nonlinear Viscous Fluid Dampers." Journal of Structural Engineering 134, no. 1 (January 2008): 56–63. http://dx.doi.org/10.1061/(asce)0733-9445(2008)134:1(56).

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10

TANIGUCHI, Shoji. "Behavior of Particles in Fluid." Tetsu-to-Hagane 75, no. 1 (1989): 187–88. http://dx.doi.org/10.2355/tetsutohagane1955.75.1_187.

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11

Zschunke, F., R. Rivas, and P. O. Brunn. "Temperature Behavior of Magnetorheological Fluids." Applied Rheology 15, no. 2 (April 1, 2005): 116–21. http://dx.doi.org/10.1515/arh-2005-0007.

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AbstractMagnetorheological fluids (MRFs) show a high but reversible rise of the viscosity upon application of an external magnetic field. This effect can be utilized in controllable friction dampers where the MR fluid flows through a gap with a adjustable magnetic field. The change in the magnitude of the magnetic field leads to a change of the viscosity of the fluid which in turn effects the pressure drop in the system. So the damping force can be controlled by the magnitude of the external magnetic field. This energy dissipation leads to a rise of the damper temperature. For designing those dampers it is vital to know the influence of the geometry, which influences the magnetic field strength, as well as the flow properties and the temperature dependence of the magnetorheological effect. An approach to the solution of this problem is shown by using an Arrhenius relationship, where the fluid viscosity is a function of the shear rate, the magnetic field and the temperature. The aim of the here presented research is to show how the fluid behavior can be simply modeled for use in CFD codes to design dampers or other applications.

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12

Aoshima, Yuki, and Hiroaki Hasegawa. "OS23-2 The Behavior of a Non-Circular Synthetic Jet Issued into a Turbulent Boundary Layer(Thermo-fluid dynamics(1),OS23 Thermo-fluid dynamics,FLUID AND THERMODYNAMICS)." Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics 2015.14 (2015): 279. http://dx.doi.org/10.1299/jsmeatem.2015.14.279.

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13

Gozalpour, F., A. Danesh, D. H. Tehrani, A. C. Todd, and B. Tohidi. "Predicting Reservoir Fluid Phase and Volumetric Behavior From Samples Contaminated With Oil-Based Mud." SPE Reservoir Evaluation & Engineering 5, no. 03 (June 1, 2002): 197–205. http://dx.doi.org/10.2118/78130-pa.

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Summary The impact of sample contamination with oil-based mud filtrate on phase behavior and properties of different types of reservoir fluids, including gas condensate and volatile oil, has been investigated. Two simple methods are used to determine the uncontaminated fluid composition from contaminated samples. The capability of the methods is demonstrated against highly contaminated samples. An equation-of-state (EOS)-based method also has been developed to predict the phase and volumetric properties of the retrieved composition. The method determines the required parameters of the EOS for the uncontaminated fluid using the developed phase-behavior models from contaminated-sample data. The method has been examined against experimental data of different types of reservoir fluids with successful results. Introduction Accurate reservoir fluid composition and properties are essential for reservoir management and development. Reliable reservoir fluid samples are therefore required; however, major challenges can render the fluid analysis limited in value. The reservoir fluid samples for pressure/volume/temperature (PVT) tests can be collected by bottomhole and/or surface sampling techniques as appropriate. During the drilling process, owing to overbalance pressure in the mud column, mud filtrate invades the formation. If an oil-based mud is used in the drilling, it can cause major difficulties in collecting high-quality formation fluid samples. Because the filtrate of oil-based drilling mud is miscible with the formation fluid, it could significantly alter the composition and phase behavior of the reservoir fluid. Even the presence of a small amount of oil-based filtrate in the collected sample could significantly affect the PVT properties of the formation fluid. Oil-based mud is used widely in the petroleum industry. Contamination with oil-based mud filtrate could affect reservoir fluid properties such as saturation pressure, formation volume factor, gas/liquid ratio, and stock-tank liquid density. Because collecting a reservoir fluid sample is expensive, and accurate reservoir fluid properties are needed in reservoir development, it is highly desirable to determine accurate composition and phase behavior for the reservoir fluid from contaminated samples. This study investigates the impact of sample contamination with oil-based mud filtrates on composition and phase behavior properties of different types of reservoir fluids, including volatile oil and gas condensate samples. The samples were purposely contaminated with a known amount of oil-based mud filtrates in the laboratory. The methods developed in this study were then applied to determine the original composition of the reservoir fluid from contaminated samples. The phase behavior of the contaminated samples was also investigated by performing constant composition expansion (CCE) tests at reservoir and surface conditions. The measured experimental data were used to tune EOSs by adjusting their parameters. The determined parameters of EOS tuned to the contaminated samples were used to calculate the parameters of EOS for the uncontaminated sample. EOS EOSs are used extensively to simulate the volumetric behavior and phase equilibrium of petroleum reservoir fluids. Among different types of EOSs, cubic EOSs have enjoyed considerable success in modeling because they are simple and give reliable results in phase equilibrium calculations. Two EOSs, the Valderrama1 modification of the Patel-Teja (VPT) EOS and a modified Peng-Robinson2 (mPR) EOS, were used in this study to perform phase equilibrium calculations. All binary interaction parameters (BIP) in the mixing rule were set to zero, and the temperature dependency of the attractive term was used as the tuning parameter to fit the measured data.3 Extended compositional analyses (up to C20+) of fluids were used in phase equilibrium calculations. The required critical properties of petroleum fractions to calculate parameters of EOS were determined by perturbation expansion correlations.4 The required boiling-point temperatures were calculated from the Riazi- Daubert5 correlation using the molecular weight and specific gravity of petroleum fractions. The Lee-Kesler6 correlation was used to calculate the accentric factor of compounds. Contaminated Reservoir Fluids Hydrocarbon-based fluids (natural or synthetic oils) are generally used in oil-based drilling muds. Because these fluids are soluble in the reservoir fluid, they can render the fluid analysis limited in value. Determination of the original fluid composition from the analysis of a contaminated sample is feasible, but isolating the properties of the reservoir fluid free from contamination is not easily accomplished. Despite the recent improvements in sampling reservoir fluids,7,8 obtaining a contamination-free formation fluid is a major challenge, particularly in openhole wells. Therefore, modeling techniques are required, along with the laboratory studies, to determine the composition and PVT properties of the uncontaminated fluid. We have demonstrated, as have other investigators,9,10 that an exponential relationship exists between the concentration of components in the C8+ portion of real reservoir fluids and the corresponding molecular weights. For example, if the molar concentration of single carbon number groups is plotted against their molecular weights, it will give a straight line on a semilogarithmic scale. Based on this feature of natural fluids, two methods have been developed in this study to retrieve the original composition of reservoir fluid from contaminated samples. The composition of the C8+ portion of contaminated sample is plotted against molecular weight on a semilogarithmic scale. The plotted data will show a departure from the line over the range affected by the contaminants (see Fig. 1). The concentrations of the contaminants are then skimmed from the semilog straight line, presumed to be valid for the uncontaminated reservoir fluid. The fitted line is used to determine the composition of the uncontaminated fluid. The above method, referred to as the Skimming method, gives a reliable composition of the uncontaminated fluid if the contaminant comprises a limited hydrocarbon range. MacMillan et al.11 developed a similar method. They fitted a gamma distribution function to the composition of the C7+ portion of contaminated oil samples, excluding the composition of contaminants from the datafitting procedure.

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14

LIU, M. B., J. Z. CHANG, H. T. LIU, and T. X. SU. "MODELING OF CONTACT ANGLES AND WETTING EFFECTS WITH PARTICLE METHODS." International Journal of Computational Methods 08, no. 04 (November 20, 2011): 637–51. http://dx.doi.org/10.1142/s0219876211002733.

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The physics of fluid–fluid–solid contact line dynamics and wetting behaviors are closely related to the inter-particle and intra-molecular hydrodynamic interactions of the concerned multiple phase system. Investigation of surface tension, contact angle, and wetting behavior using molecular dynamics (MD) is practical only on extremely small time scales (nanoseconds) and length scales (nanometers) even if the most advanced high-performance computers are used. In this article we introduce two particle methods, which are smoothed particle hydrodynamics (SPH) and dissipative particle dynamics (DPD), for multiphase fluid motion on continuum scale and meso-scale (between the molecular and continuum scales). In both methods, the interaction of fluid particles and solid particles can be used to study fluid–fluid–solid contact line dynamics with different wetting behaviors. The interaction strengths between fluid particles and between fluid and wall particles are closely related to the wetting behavior and the contact angles. The effectiveness of SPH and DPD in modeling contact line dynamics and wetting behavior has been demonstrated by a number of numerical examples that show the complexity of different multiphase flow behaviors.

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15

Kaminsky, R. D. "Predicting Single-Phase and Two-Phase Non-Newtonian Flow Behavior in Pipes." Journal of Energy Resources Technology 120, no. 1 (March 1, 1998): 2–7. http://dx.doi.org/10.1115/1.2795006.

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Improved and novel prediction methods are described for single-phase and two-phase flow of non-Newtonian fluids in pipes. Good predictions are achieved for pressure drop, liquid holdup fraction, and two-phase flow regime. The methods are applicable to any visco-inelastic non-Newtonian fluid and include the effect of surface roughness. The methods utilize a reference fluid for which validated models exist. For single-phase flow, the use of Newtonian and power-law reference fluids are illustrated. For two-phase flow, a Newtonian reference fluid is used. Focus is given to shear-thinning fluids. The approach is theoretically based and is expected to be more accurate for large, high-pressure pipelines than present correlation methods, which are all primarily based on low-pressure, small-diameter pipe experimental data.

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16

Li, Wen Ting. "Flow Behavior of Polymer Viscoelastic Fluid in Complex Channel." Advanced Materials Research 774-776 (September 2013): 379–82. http://dx.doi.org/10.4028/www.scientific.net/amr.774-776.379.

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A finite volume method for the numerical solution of viscoelastic flows is given. The flow of a differential Phan-Thien-Tanner (PTT) fluid through an abrupt expansion-contraction channel has been chosen as a prototype example. Through the results of numerical simulations, the contours of velocity and stream function are drawn. Numerical results show that the viscoelasticity of polymer solutions is the main factor influencing the sweep efficiency. With increasing elasticity, the flowing area in the channel is enlarged significantly, thus the area with immobile zones becomes smaller, the microcosmic sweep efficiency increases. The visco-elastic nature of the displacing polymer fluids can ingeneral improve the displacement efficiency in pores compared to using Newtonian fluids. This conclusion should be useful in selecting polymer fluids and designing polymer flooding operations.

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17

de Deus, Hilbeth P. Azikri, Guilherme S. Paez Dupim, and Claudio R. Avila da Silva. "Some Aspects over Thixotropic Fluid Behavior." Advanced Materials Research 629 (December 2012): 623–34. http://dx.doi.org/10.4028/www.scientific.net/amr.629.623.

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In this work some theoretical aspects of constitutive equations for thixotropic fluids and restrictions on their functional forms are formally discussed. In the current study a formal emphasis has been given to the structural nature of this substances. The behavior of thixotropic fluids is analyzed in terms of simple isothermal laminar shear flow.

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18

Łukaszewicz, Grzegorz. "Asymptotic behavior of micropolar fluid flows." International Journal of Engineering Science 41, no. 3-5 (March 2003): 259–69. http://dx.doi.org/10.1016/s0020-7225(02)00208-2.

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19

Berkowitz, Rachel. "Fluid dynamics explains ancient organism behavior." Physics Today 70, no. 12 (December 2017): 25. http://dx.doi.org/10.1063/pt.3.3786.

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20

McCain, William D. "Heavy Components Control Reservoir Fluid Behavior." Journal of Petroleum Technology 46, no. 09 (September 1, 1994): 746–50. http://dx.doi.org/10.2118/28214-pa.

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21

TAKEUCHI, Masami, Tatsushi KAWAI, Hisao FUKUI, Hiroshi MURAKAMI, and Jiro HASEGAWA. "Fluid Behavior of Root Canal Paste." Dental Materials Journal 4, no. 1 (1985): 93–99. http://dx.doi.org/10.4012/dmj.4.93.

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22

Holder, G. D. "Phase behavior in fluid-solid systems." Fluid Phase Equilibria 29 (October 1986): 447–55. http://dx.doi.org/10.1016/0378-3812(86)85043-9.

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23

Tohver, Valeria, Angel Chan, Osamu Sakurada, and Jennifer A. Lewis. "Nanoparticle Engineering of Complex Fluid Behavior." Langmuir 17, no. 26 (December 2001): 8414–21. http://dx.doi.org/10.1021/la011252w.

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24

Stell, George. "Critical behavior of ionic-fluid models." Physical Review A 45, no. 10 (May 1, 1992): 7628–31. http://dx.doi.org/10.1103/physreva.45.7628.

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25

Mathias, Paul M., and Suphat Watanasiri. "Some Patterns of Fluid Phase Behavior." Journal of Chemical & Engineering Data 56, no. 4 (April 14, 2011): 1658–65. http://dx.doi.org/10.1021/je200004s.

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26

Vescovi, Dalila, and Stefan Luding. "Merging fluid and solid granular behavior." Soft Matter 12, no. 41 (2016): 8616–28. http://dx.doi.org/10.1039/c6sm01444e.

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27

Levelt Sengers, J. M. H., G. Morrison, G. Nielson, R. F. Chang, and C. M. Everhart. "Thermodynamic behavior of supercritical fluid mixtures." International Journal of Thermophysics 7, no. 2 (March 1986): 231–43. http://dx.doi.org/10.1007/bf00500151.

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28

Speers, R. A., K. R. Holme, M. A. Tung, and W. T. Williamson. "Drilling fluid shear stress overshoot behavior." Rheologica Acta 26, no. 5 (September 1987): 447–52. http://dx.doi.org/10.1007/bf01333845.

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29

Bernard, P. F., J. M. Dorlot, J. D. Bobyn, and G. Drouin. "Rheologic behavior of intracancellous bone fluid." Journal of Biomechanics 18, no. 7 (January 1985): 522–23. http://dx.doi.org/10.1016/0021-9290(85)90696-7.

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30

Shah, Parth, Gauranga C. samanta, and Salvatore Capozziello. "Qualitative behavior of cosmological models combining various matter fields." International Journal of Modern Physics A 33, no. 18n19 (July 9, 2018): 1850116. http://dx.doi.org/10.1142/s0217751x18501166.

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The late time accelerated expansion of the universe can be realized using scalar fields with the given self-interacting potentials. Here, we consider a straightforward approach where a three cosmic fluid mixture is assumed. The fluids are standard matter perfect fluid, dark matter, and a scalar field with the role of dark energy. A dynamical system analysis is developed in this context. A central role is played by the equation of state [Formula: see text] which determines the acceleration phase of the models. Determining the domination of a particular fluid at certain stages of the universe history by stability analysis allows, in principle, to establish the succession of the various cosmological eras.

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31

Chen, X. B. "Time-Dependent Rheological Behavior of Fluids For Electronics Packaging." Journal of Electronic Packaging 127, no. 4 (March 9, 2005): 370–74. http://dx.doi.org/10.1115/1.2056568.

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In electronics packaging, one of the key processes is dispensing fluid materials, such as adhesive, epoxy, encapsulant, onto substrates or printed circuit boards for the purpose of surface mounting or encapsulation. In order to precisely control the dispensing process, the understanding and characterization of the flow behavior of the fluid being dispensed is very important, as the behavior can have a significant influence on the dispensing process. However, this task has proven to be very challenging due to the fact that the fluids for electronics packaging usually exhibit the time-dependent rheological behavior, which has not been well defined in literature. In the paper a study on the characterization of the time-dependent rheological behavior of the fluids for electronics packaging is presented. In particular, a model is developed based on structural theory and then applied to the characterization of the decay and recovery of fluid behavior, which happen in the dispensing process due to the interruption of process. Experiments are carried out to verify the effectiveness of the model developed.

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32

Lucking Bigué, Jean-Philippe, François Charron, and Jean-Sébastien Plante. "Squeeze-strengthening of magnetorheological fluids (part 1): Effect of geometry and fluid composition." Journal of Intelligent Material Systems and Structures 29, no. 1 (May 3, 2017): 62–71. http://dx.doi.org/10.1177/1045389x17705214.

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Recent research has shown that magnetorheological fluid can undergo squeeze-strengthening when flow conditions promote filtration. While a Péclet number has been used to predict filtration in non-magnetic two-phase fluids submitted to slow compression, the approach has yet to be adapted to magnetorheological fluid behavior in order to predict the conditions leading to squeeze-strengthening behavior of magnetorheological fluid. In this article, a Péclet number is derived and adapted to the Bingham rheological model. This Péclet number is then compared to the experimental occurrence of squeeze-strengthening behavior obtained from several squeeze geometries and magnetorheological fluid compositions submitted to pure-squeeze conditions. Results show that the Péclet number well predicts the occurrence of squeeze-strengthening behavior in high-concentration magnetorheological fluid made from various particle sizes and using various squeeze geometries. Moreover, it is shown that squeeze-strengthening occurrence is increased when using annulus geometries or by increasing average particle radius. While lowering concentration increases filtration, tested conditions only led to squeeze-strengthening behavior after concentration had increased close to packing limit. Altogether, results suggest that the Péclet number derived in this study can be used to predict the occurrence of squeeze-strengthening for various magnetorheological fluids and squeeze geometries using the well-known rheological properties of magnetorheological fluids.

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33

SEE, HOWARD, CLINTON JOUNG, and CHARLES EKWEBELAM. "DYNAMIC BEHAVIOR AND YIELDING OF FIELD-RESPONSIVE PARTICULATE SUSPENSIONS." International Journal of Modern Physics B 21, no. 28n29 (November 10, 2007): 4945–51. http://dx.doi.org/10.1142/s0217979207045876.

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We have examined the small strain response of an inverse ferrofluid system, consisting of micron-sized inert particles dispersed in a ferrofluid, which is a magnetisable liquid consisting of single domain magnetite nanoparticles. Under a magnetic field the inert particles will form elongated aggregates in the field direction, analogous to a magnetorheological fluid. It was found that the fluid appeared to have a Bingham fluid-like yield stress when analysed using the flow curve. However careful study of the behavior at very low shear rates revealed an ever decreasing shear stress. In addition, the behavior of conventional magnetorheological fluids at large strains under steady shear flow and constant magnetic field was also studied, and the results compared to particle-level computer simulations.

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34

Naji, J., A. Zabihollah, and M. Behzad. "Vibration Behavior of Laminated Composite Beams Integrated with Magnetorheological Fluid Layer." Journal of Mechanics 33, no. 4 (September 13, 2016): 417–25. http://dx.doi.org/10.1017/jmech.2016.90.

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AbstractVibration behavior of adaptive laminated composite beams integrated with magnetorheological (MR) fluid layer has been investigated using layerwise displacement theory. In most of the existing studies on the adaptive laminated beams with MR fluids, shear strain across the thickness of magnetorheological (MR) layer has been assumed a constant value, resulting in a constant shear stress in MR layer. However, due to the high shear deformation pattern inside MR layer, this assumption is not adequate to accurately describe the shear strain and stress in MR fluid layer. In this work a modified layerwise theory is employed to develop a Finite Element Model (FEM) formulation to simulate the laminated beams integrated with MR fluids. In the present model, each layer is modeled based on First-order Shear Deformation Theory (FSDT). The inter-laminar stresses between face-layer and MR layer is estimated more precise so FEM results are more accurate. Standard test of ASTM E 756-98 was employed to develop an empirical relationship for the complex shear modulus of MR fluid. Numerical examples have been illustrated the effects of MR fluid layer on the vibration behavior of the laminated beam. An experimental setup has been (FSDT) fabricated for the verification of the results.

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35

Ginder, John M. "Behavior of Magnetorheological Fluids." MRS Bulletin 23, no. 8 (August 1998): 26–29. http://dx.doi.org/10.1557/s0883769400030785.

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In the absence of an applied magnetic field, magnetorheological (MR) fluids typically behave as nearly ideal Newtonian liquids. The application of a magnetic field induces magnetic dipole and multipole moments on each particle. The anisotropic magnetic forces between pairs of particles promote the head-to-tail alignment of the moments and draws the particles into proximity. These attractive interparticle forces lead to the formation of chains, columns, or more complicated networks of particles aligned with the direction of the magnetic field. When these structures are deformed mechanically, magnetic restoring forces tend to oppose the deformation. Substantial field-dependent enhancements of the rheological properties of these materials result, as demonstrated in Figure 1.The myriad potential applications of MR and electrorheological (ER) fluids provide considerable motivation for research on these materials. The availability of fluids with yield stresses or apparent viscosities that are controllable over many orders of magnitude by applied fields enables the construction of electromechanical devices that are engaged and controlled by electrical signals and that require few or no moving parts. Potential automotive applications include electrically engaged clutches for vehicle powertrains and engine accessories as well as semiactive shock absorbers that can adapt in real time to changing road conditions. Semiactive dampers for rotorcraft control surfaces are among the potential aerospace applications. The critical need to mitigate the structural vibrations of large structures has led to the construction of large, high-force MR-fluid-based dampers. A promising application in manufacturing processes is the computer-aided polishing of precision optics in which abrasive particles are suspended in an MR fluid so that the polishing rate is determined in part by the strength of an applied magnetic field.

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36

Mishra, Manish, P. K. Das, and Sunil Sarangi. "Transient Behavior of Crossflow Heat Exchangers With Longitudinal Conduction and Axial Dispersion." Journal of Heat Transfer 126, no. 3 (June 1, 2004): 425–33. http://dx.doi.org/10.1115/1.1738422.

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Transient temperature response of the crossflow heat exchangers with finite wall capacitance and both fluids unmixed is investigated numerically for step, ramp and exponential perturbations provided in hot fluid inlet temperature. Effect of two-dimensional longitudinal conduction in separating sheet and axial dispersion in fluids on the transient response has been investigated. Conductive heat transport due to presence of axial dispersion in fluids have been analyzed in detail and shown that presence of axial dispersion in both of the fluid streams neutralizes the total conductive heat transport during the energy balance. It has also been shown that the presence of axial dispersion of high order reduces the effect of longitudinal conduction.

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37

Hsu, C. H., S. Y. Hu, K. Y. Kung, C. C. Kuo, and 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, no. 2 (December 20, 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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Wijayanti, Wahyu, Laily Isro'in, and Lina Ema Purwanti. "Analisis Perilaku Pasien Hemodialisis dalam Pengontrolan Cairan Tubuh." Indonesian Journal for Health Sciences 1, no. 1 (March 31, 2017): 10. http://dx.doi.org/10.24269/ijhs.v1i1.371.

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The behavior of the fluid control in hemodialysis patients can determine the success of hemodialysis therapy. Hemodialysis patients who do not abide by controlling the fluid can develop complications such as congestive heart failure. This study aimed to identify the behavior of hemodialysis patients in the control of body fluids in the Hemodialysis Dr. Harjono Ponorogo General Hospitals. The design used is descriptive with a population of 250 hemodialysis patients in Dr. Harjono Ponorogo General Hospitals. Total sample of 38 respondents to the sampling technique used was purposive sampling. Data Collection using questionnaires. Data were analyzed using T-Score categories of good and bad behavior. From The study, of 38 respondents we obtained 20 respondents (52.63%) had a bad behavior and 18 respondents (47.36%) had good behavior. The behavior of the fluid control in hemodialysis patients can be improved by providing better support from health professionals and families of patients during hemodialysis and self-efficacy training. Recommendations for further research conduct research on "The Relationship Behavior In Hemodialysis Patients With Body Fluids Controls Risk of Complications.

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39

Marum, Daniela Martins, Maria Diná Afonso, and Brian Bernardo Ochoa. "Rheological behavior of a bentonite mud." Applied Rheology 30, no. 1 (January 1, 2020): 107–18. http://dx.doi.org/10.1515/arh-2020-0108.

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Abstract Predicting drilling fluids rheology is crucial to control/optimize the drilling process and the gas extraction from drilling fluids in logging systems. A Couette viscometer measured the apparent viscosity of a bentonite mud at various shear rates and temperatures. The bentonite mud behaved as a yield-pseudoplastic fluid, and a modified Herschel-Bulkley model predicted the shear rate and temperature effects upon the shear stress. A pipe viscometer was built to seek a correlation between the mud flow rate and the pressure drop and thereby determine refined Herschel-Bulkley parameters. Coupling a rheological model to a pipe viscometer enables the continuous acquisition of apparent viscosities of Newtonian or non-Newtonian fluids at a rig-site surface.

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Rosch, Thomas W., and Jeffrey R. Errington. "Phase Behavior of Model Confined Fluids. Influence of Substrate−Fluid Interaction Strength." Journal of Physical Chemistry B 112, no. 47 (November 27, 2008): 14911–19. http://dx.doi.org/10.1021/jp804419b.

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41

Kiselev, S. B., I. G. Kostyukova, and A. A. Povodyrev. "Universal crossover behavior of fluids and fluid mixtures in the critical region." International Journal of Thermophysics 12, no. 5 (September 1991): 877–95. http://dx.doi.org/10.1007/bf00502413.

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42

Luo, Sheng, Jodie L. Lutkenhaus, and Hadi Nasrabadi. "Effect of Nanoscale Pore-Size Distribution on Fluid Phase Behavior of Gas-Improved Oil Recovery in Shale Reservoirs." SPE Journal 25, no. 03 (March 13, 2020): 1406–15. http://dx.doi.org/10.2118/190246-pa.

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Summary The improved oil recovery (IOR) of unconventional shale reservoirs has attracted much interest in recent years. Gas injection, such as carbon dioxide (CO2) and natural gas, is one of the most considered techniques for its sweep efficiency and effectiveness in low-permeability reservoirs. However, the uncertainties of fluid phase behavior in shale reservoirs pose a great challenge in evaluating the performance of a gas-injection operation. Shale reservoirs typically have macroscale to nanoscale pore-size distribution in the porous space. In fractures and macropores, the fluid shows bulk behavior, but in nanopores, the phase behavior is significantly altered by the confinement effect. The integrated behavior of reservoir fluids in this complex environment remains uncertain. In this study, we investigate the nanoscale pore-size-distribution effect on the phase behavior of reservoir fluids in gas injection for shale reservoirs. A case of Anadarko Basin shale oil is used. The pore-size distribution is discretized as a multiscale system with pores of specific diameters. The phase equilibria of methane injection into the multiscale system are calculated. The constant-composition expansions are simulated for oil mixed with various fractions of injected gas. It is found that fluid in nanopores becomes supercritical with injected gas, but lowering the pressure to less than the bubblepoint turns it into the subcritical state. The bubblepoint is generally lower than the bulk and the degree of deviation depends on the amount of injected gas. The modeling of confined-fluid swelling shows that fluid swelled from nanopores is predicted to contain more oil than the swelled fluid at bulk state.

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43

Ross, Michael G., and Mark J. M. Nijland. "Development of ingestive behavior." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 274, no. 4 (April 1, 1998): R879—R893. http://dx.doi.org/10.1152/ajpregu.1998.274.4.r879.

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Swallowing represents a primary physiological function that provides for the ingestion of food and fluid. In precocial species, swallowing activity likely develops in utero to provide for a functional system during the neonatal period. The chronically instrumented ovine fetal preparation has provided the opportunity for recent advances in understanding the regulation of in utero swallowing activity. The near-term ovine fetus swallows fluid volumes (100–300 ml/kg) that are markedly greater, per body weight, than that of the adult (40–60 ml/kg). Spontaneous in utero swallowing and ingestive behavior contribute importantly to the regulation of amniotic fluid volume and composition, the acquisition and potential recirculation of solutes from the fetal environment, and the maturation of the fetal gastrointestinal tract. Fetal swallowing activity is influenced by fetal maturation, neurobehavioral state alterations, and the volume of amniotic fluid. Furthermore, intact dipsogenic mechanisms (osmolality, angiotensin II) have been demonstrated in the near-term ovine fetus. It remains unknown to what degree, if any, fetal swallowing may be influenced by nutrient appetite, salt appetite, or taste. Nevertheless, the development of dipsogenic and additional regulatory mechanisms for ingestive behavior occurs during fetal life and may be susceptible to changes in the pregnancy environment. This review describes what is currently known regarding the in utero development of ingestive behavior and the importance of this activity for fetal and perhaps ultimately adult fluid homeostasis.

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Harstad, K., and J. Bellan. "Isolated fluid oxygen drop behavior in fluid hydrogen at rocket chamber pressures." International Journal of Heat and Mass Transfer 41, no. 22 (November 1998): 3537–50. http://dx.doi.org/10.1016/s0017-9310(98)00049-0.

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Novotný, Jakub, and František Foret. "Fluid manipulation on the micro-scale: Basics of fluid behavior in microfluidics." Journal of Separation Science 40, no. 1 (November 11, 2016): 383–94. http://dx.doi.org/10.1002/jssc.201600905.

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46

Weissburg, MJ. "The fluid dynamical context of chemosensory behavior." Biological Bulletin 198, no. 2 (April 2000): 188–202. http://dx.doi.org/10.2307/1542523.

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47

Hashemi, S., M. M. Saadatpour, and M. R. Kianoush. "Dynamic behavior of flexible rectangular fluid containers." Thin-Walled Structures 66 (May 2013): 23–38. http://dx.doi.org/10.1016/j.tws.2013.02.001.

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D’Auria, Bernardo, and Gennady Samorodnitsky. "Limit Behavior of Fluid Queues and Networks." Operations Research 53, no. 6 (December 2005): 933–45. http://dx.doi.org/10.1287/opre.1050.0215.

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49

Frank, Katherine, Christopher Childers, Dhanadeep Dutta, David Gidley, Matthew Jackson, Steve Ward, Rob Maskell, and Jeffrey Wiggins. "Fluid uptake behavior of multifunctional epoxy blends." Polymer 54, no. 1 (January 2013): 403–10. http://dx.doi.org/10.1016/j.polymer.2012.11.065.

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50

Dingwell, D. B., K. U. Hess, and C. Romano. "Extremely fluid behavior of hydrous peralkaline rhyolites." Earth and Planetary Science Letters 158, no. 1-2 (May 1998): 31–38. http://dx.doi.org/10.1016/s0012-821x(98)00046-6.

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