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Готові списки джерел за темами / Non-uniform fluid

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Добірка наукової літератури з теми "Non-uniform fluid"

Автор: Grafiati

Опубліковано: 25 листопада 2022

Оновлено: 8 грудня 2022

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Статті в журналах з теми "Non-uniform fluid"

1

Shi-Qi, Zhou. "Theoretical Investigation of Uniform and Non-uniform Penetrable Sphere Fluid." Communications in Theoretical Physics 46, no. 2 (August 2006): 323–31. http://dx.doi.org/10.1088/0253-6102/46/2/029.

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2

Evans, R. G. "Non-uniform illumination of laser targets." Laser and Particle Beams 3, no. 3 (August 1985): 273–81. http://dx.doi.org/10.1017/s0263034600001488.

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Attempts to accelerate and implode laser targets are hindered by the non-uniformities present in real laser beams. The effects of non-uniform illumination are ‘smoothed’ by thermal transport in the low density ablation plasma but amplified by the fluid instabilities (Rayleigh–Taylor) present in the high density accelerated material. In this paper the effects of different assumptions concerning the plasma thermal conductivity are analysed and the inclusion of the full fluid equations is shown to introduce oscillatory (acoustic) and growing (Rayleigh–Taylor) phenomena into the fluid response.

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3

Mollaabbasi, R., and S. M. Taghavi. "Buoyant displacement flows in slightly non-uniform channels." Journal of Fluid Mechanics 795 (April 22, 2016): 876–913. http://dx.doi.org/10.1017/jfm.2016.232.

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We consider displacement flows in slightly diverging or converging plane channels. The two fluids are miscible and buoyancy is significant. We assume that the channel is oriented close to horizontal. Employing a classical lubrication approximation, we simplify the governing equations to furnish a semi-analytical solution for the flux functions. Then, we demonstrate how the non-uniformity of the displacement flow geometry can affect the propagation of the interface between the heavy and light fluids in time, for various parameters studied, e.g. the viscosity ratio, a buoyancy number and rheological features. By setting the molecular diffusion effects to zero, certain solution behaviours at longer times can be practically predicted through the associated hyperbolic problem, using which it becomes possible to directly compute the interfacial features of interest, e.g. leading and trailing front heights and speeds. For a Newtonian displacement flow in a converging or uniform channel, as the buoyancy number increases from zero, we are able to classify three flow regimes based on the behaviour of the trailing front near the top of the channel: a no-back-flow regime, a stationary interface flow regime, and a sustained back-flow regime. For the case of a diverging channel flow, the sustained back-flow regime is replaced by an eventually stationary interface flow regime. In addition, as the displacement flow progresses, the leading front speed typically increases (decreases) in a converging (diverging) channel, while the opposite is usually true for the front height. For the no-back-flow regime (i.e. with small buoyancy), the solution of the displacement flow at long times in all the geometries considered converges to a similarity form, while no similarity form is found for the other flow regimes. As the displacement flow develops, frontal diffusive effects are reduced (enhanced) in a converging (diverging) channel and multiple fronts are progressively less (more) present in a converging (diverging) channel. Regarding non-Newtonian effects, a shear-thinning fluid displacing a Newtonian fluid exhibits an increasingly fast front that has a short height in a converging channel. When a yield stress is present in the displaced fluid, it is possible to find residual wall layers of displaced fluid that are completely static. These layers disappear at a certain critical downstream distance in a converging channel while they appear at a critical distance in a diverging channel. Finally, the combination of strong buoyant and yield-stress effects can modify the destiny of a second front that follows the leading front.

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4

Zhongzhong, Wang, Li Decai, and Zhou Jing. "Non-uniform Distribution of Magnetic Fluid in Multistage Magnetic Fluid Seals." Journal of Magnetics 22, no. 2 (June 30, 2017): 299–305. http://dx.doi.org/10.4283/jmag.2017.22.2.299.

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5

Percus, J. K. "Entropy of a non-uniform one-dimensional fluid." Journal of Physics: Condensed Matter 1, no. 17 (May 1, 1989): 2911–22. http://dx.doi.org/10.1088/0953-8984/1/17/011.

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6

Percus, J. K. "The pressure tensor in a non-uniform fluid." Chemical Physics Letters 123, no. 4 (January 1986): 311–14. http://dx.doi.org/10.1016/0009-2614(86)80078-1.

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7

Mekheimer, K. S., and Y. Abd Elmaboud. "Peristaltic Transport of a Particle–Fluid Suspension through a Uniform and Non-Uniform Annulus." Applied Bionics and Biomechanics 5, no. 2 (2008): 47–57. http://dx.doi.org/10.1155/2008/391687.

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This study looks at the influence of an endoscope on the peristaltic flow of a particle–fluid suspension (as blood model) through tubes. A long wavelength approximation through a uniform and non-uniform infinite annulus filled with an incompressible viscous and Newtonian fluid mixed with rigid spherical particles of identical size is investigated theoretically. The inner tube is uniform, rigid and moving with a constant velocity V0, whereas the outer non-uniform tube has a sinusoidal wave travelling down its wall. The axial velocity of the fluid phase uf, particulate phase upand the pressure gradients have been obtained in terms of the dimensionless flow rateQ, the amplitude ratioɸ, particle concentrationC, the velocity constant V0and the radius ratio ϵ (the ratio between the radius of the inner tube and the radius of the outer one at the inlet). Numerical calculations for various values of the physical parameters of interest are carried out for the pressure rise and the friction force on the inner and the outer tubes.

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8

Barrett, Jonathan C. "Random phase approximation for the non-uniform Yukawa fluid." Journal of Physics: Condensed Matter 31, no. 15 (February 18, 2019): 155002. http://dx.doi.org/10.1088/1361-648x/ab0037.

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9

Pelevina, D. A., V. A. Naletova, and V. A. Turkov. "Magnetic fluid bridge in a non-uniform magnetic field." Journal of Magnetism and Magnetic Materials 431 (June 2017): 184–87. http://dx.doi.org/10.1016/j.jmmm.2016.09.059.

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10

Ünal, H. C. "Temperature distributions in fins with uniform and non-uniform heat generation and non-uniform heat transfer coefficient." International Journal of Heat and Mass Transfer 30, no. 7 (July 1987): 1465–77. http://dx.doi.org/10.1016/0017-9310(87)90178-5.

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Більше джерел

Дисертації з теми "Non-uniform fluid"

1

MacInnes, J. M. "Turbulence modelling of flows with non-uniform density." Thesis, University of Manchester, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378221.

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2

Mallory, David A. "Experimental investigation of non-uniform flow past propellers." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/101447.

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An experimental investigation of non-uniform flow past a 1.615 foot, 3-bladed propeller was conducted in the Virginia Tech 6 foot by 6 foot Stability Wind Tunnel. The free stream velocity was 44.5 ft/sec and the propeller rpm 1400. A screen disk consisting of two circular meshes, one 15 inches in diameter and the other 5, along with a 30 degree wedge having a 7.5 inch radius, was used to create the non-uniform inflow. The screen disk was chosen to simulate a wake flow behind a slender body with an attached appendage. The propeller was operated at self-propelled mode with respect to the drag of the screen disk. Several types of measurements were completed on the propeller and the near wake. First, the propeller performance quantities were measured. The second type of measurements were the mean flow quantities, which included the mean velocities and static pressures. These were obtained by using a five hole yawhead probe. The third type of measurements were made with an x-wire probe, constant temperature anemometer and an r.m. s. meter. These allowed all the turbulence quantities, intensities and shear stresses, to be obtained. All turbulence quantities were averaged in the peripheral direction. The results of the mean and turbulent flow under the non-uniform flow condition are documented and discussed in detail. The 3-D non-uniform inflow caused the location of the maximum thrust to be shifted from . 7R, previously found for uniform inflow for the same propeller, to .88R while the location of maximum swirl was shifted inward from .6R to .5R. The turbulence quantities were sensitive to the non-uniform mean inflow and the upstream turbulence created by the screen disk, especially in the wake of the wedge region. This was generally observed in the form of higher turbulence intensities and shear stresses. This data can be used to verify and refine turbulent transport models and computational methods for flows of this type.
M.S.

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3

Zhang, Xingchen. "CAD-based geometry parametrisation for shape optimisation using non-uniform rational B-splines." Thesis, Queen Mary, University of London, 2018. http://qmro.qmul.ac.uk/xmlui/handle/123456789/43186.

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With the continuous growth in computing power, numerical optimisation is increasingly applied in shape optimisation using Computational Fluid Dynamics (CFD). Since CFD computations are expensive, gradient-based optimisation is preferable when the number of design variables is large. In particular the recent progress with adjoint solvers is important, as these solvers allow to compute the gradients at constant computational cost regardless of the number of design variables, and as a consequence enable the use of automatically derived and rich design spaces. One of the crucial steps in shape optimisation is the parametrisation of the geometry, which directly determines the design space and thus the nal results. This thesis focuses on CAD-based parametrisations with the CAD model continuously updated in the design loop. An existing approach that automatically derives a parametrisation from the control points of a net of B-Spline patches is extended to include NURBS. Continuity constraints for water-tightness, tangency and curvature across patch interfaces are evaluated numerically and a basis for the resulting design space is computed using Singular Value Decomposition (SVD). A CAD-based shape optimisation framework is developed, coupling a flow solver, an adjoint solver, the in-house CAD kernel and a gradient-based optimiser. The flow sensitivities provided by the adjoint solver and the geometric sensitivities computed through automatic differentiation (AD) are assembled and provided to the optimiser. An extension to maintain the design space and hence enables use of a quasi-Newton method such as the BFGS algorithm is also presented and the convergence improvements are demonstrated. The framework is applied to three shape optimisation cases to show its effectiveness. The performance is assessed and analysed. The effect of parameters that can be chosen by the user are analysed over a range of cases and best practice choices are identified.

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4

Hall, Brenton Taylor. "Using the Non-Uniform Dynamic Mode Decomposition to Reduce the Storage Required for PDE Simulations." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1492711382801134.

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5

Veeramachaneni, Usha K. "Analysis of forces acting on super paramagnetic beads in fluid medium in the presence of non uniform magnetic beads." Morgantown, W. Va. : [West Virginia University Libraries], 2009. http://hdl.handle.net/10450/10477.

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Thesis (M.S.)--West Virginia University, 2009.
Title from document title page. Document formatted into pages; contains xiii, 96 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 86-87).

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6

Ommi, Siddhartha Harsha. "Study of hydro-mechanical instabilities in geomaterials." Thesis, Ecole centrale de Nantes, 2022. http://www.theses.fr/2022ECDN0017.

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Анотація:

Les instabilités hydrauliques et mécaniques dans les géomatériaux font référence à une variété de phénomènes non-linéaires qui peuvent être déclenchés par les hétérogénéités inhérentes à ces matériaux. Alors que les instabilités hydrauliques se manifester comme invasion hétérogène d’un fluide ‘par digitation', les instabilités mécaniques représentent des localisations de déformation et/ou des fractures. Ces instabilités potentiellement couplées constituent un obstacle majeur pour les applications impliquant des géomatériaux tels que la séquestration du dioxyde de carbone (CO2) et l'écoulement des contaminants dans les eaux souterraines. Les modèles classiques existants manquent des ingrédients nécessaires de modéliser la formation d’une microstructure dans leur formulation et sont donc stables contre toute perturbation. L'essence de cette thèse est de proposer et d'étudier des techniques de modélisation qui permettent de décrire ces instabilités. L'approche en loi de comportement adoptée est celle des milieux continus à micro-structure, en particulier celle des milieux continus équipés de lois de comportement dépendant du gradient de variables de type champ de phase.Dans la première partie de ce travail, un front fluide-fluide a été décrit comme une interface diffusée en interprétant la présence de deux fluides dans l'espace poreux comme un seul fluide non-uniforme et le degré de saturation de l'un des fluides comme le champ de phase. Alors que la relation classique bijective entre la pression capillaire et le degré de saturation décrit les propriétés de rétention du réseau poreux, une relation enrichie est obtenue en prescrivant un potentiel chimique dans l'esprit de la modélisation de type Cahn-Hilliard de fluides multiphasiques. Cette relation enrichie, associé à une contribution énergétique non-locale, fournit les ingrédients nécessaires à la description des instabilités hydrauliques. Dans un cadre unidimensionnel, le modèle proposé reproduit les profils de saturation non-monotones observés expérimentalement pendant l'infiltration. De plus, il a été démontré qu'une légère non-convexité introduite dans la fonction de perméabilité relative permet de modéliser les fronts de drainage, en plus de l'imbibition, sans employer de complexités supplémentaires. Une analyse de stabilité linéaire (ASL) révélant la croissance dans le temps de perturbations arbitraires a été réalisée, complétée par des simulations 2D montrant la capacité du modèle proposé à décrire digitation et la ségrégation des fluides.Dans la deuxième partie, le déclenchement d'une fissure dans un milieu poreux en cours de séchage a été étudié. Un paradigme de modélisation prédominant, impliquant la modélisation à gradient d'endommagement, a d'abord été testé pour sa capacité à reproduire la formation périodique de fissures telle qu'observée dans des expériences représentatives. De plus, un nouveau paradigme a été proposée en interprétant la présence d'une fissure comme une perte des propriétés capillaires, permettant ainsi le passage d'un fluide non-mouillant sous une pression capillaire évanescente. Ceci est applicable aux sols à grains fins sans cohésion et non-consolidés, où la résistance à traction est négligeable. En partant des principes de l'approche variationnelle, il a été montré que une dessiccation suffisamment forte peut amorcer l'endommagement de manière homogène sur la face de séchage tout en progressant dans le domaine dans le temps. L'apparition éventuelle de bifurcations de cette solution de base, représentant l'initiation de fissures périodiques, a été analysée toujours dans le cadre de l’ASL.Ce travail ouvre la voie à l'étude du couplage entre les instabilités mentionnées ci-dessus et l'investigation expérimentale des caractéristiques d'écoulement instables, telles que le pincement et la coalescence de la phase de mouillage. L'initiation d'endommagement induits par l'évolution du doigt de drainage présente également un intérêt particulier
Hydraulic and mechanical instabilities in geomaterials refer to a variety of non-linear phenomena that can be triggered by heterogeneities inherent to such materials. While hydraulic instabilities manifest themselves as heterogeneous fluid invasion causing `fingering' phenomenon, mechanical instabilities represent strain localizations and/or fractures. These instabilities and their associated coupling pose a major obstacle for applications involving geomaterials such as Carbon dioxide (CO2) sequestration and contaminant flow in ground waters. Existing classical models lack the required pattern-forming ingredients in their formulation and thus are stable against imposed perturbations. The essence of the current thesis work is to propose and investigate modeling techniques that allow to describe these instabilities. The constitutive approach adopted is that of micro-structured continua, in particular that of enhanced continua with a constitutive law depending on the gradient of so-called phase field variables.In the first part of this work, a fluid-fluid front has been described as a diffused interface by interpreting the presence of two fluids within the pore space as a single non-uniform fluid and the degree of saturation of one of the fluids as the corresponding phase field. While the classical one-to-one relation between capillary pressure and saturation degree describes retention properties of the porous network, an enhanced relation is obtained by prescribing a chemical potential in the spirit of Cahn-Hilliard type modeling of multi-phase fluids. This together with a non-local energy contribution provides the required ingredients required to describe hydraulic instabilites. In a one-dimensional setting, the proposed model allows to replicate experimentally observed non-monotonic saturation profiles during infiltration. Further, a slight non-convexity introduced into the flux function has been shown to allow modeling of drainage fronts, besides imbibition, without employing any additional complexities. A linear stability analysis (LSA) revealing the growth in time of arbitrary perturbations has been done, supplemented by two-dimensional simulations portraying the ability of the proposed model to describe fluid fingering and segregation.In the second part, triggering of a fracture within a drying porous medium has been studied. A prevailing modeling perspective, involving gradient damage modeling, has been first tested for its ability to replicate periodic fracture formation as observed in representative experiments. Further, a new paradigm has been introduced by interpreting the presence of a fracture as a loss of capillary properties, thus allowing passage of non-wetting fluid under vanishing capillary pressure. This is applicable to cohesion-less and unconsolidated fine-grained soils, where resistance against tensile loading is negligible and thus fracturing induced due to development of tensile stresses is not the prevailing phenomenon. Starting from the principles of variational approach, it has been shown that for sufficiently strong desiccation, damage initiates homogeneously on the drying face while progressing into the body with time. The possible occurrence of bifurcations of this base solution, representing initiation of periodic fractures, has been analyzed again in the framework of LSA.This work sets the stage for the study of coupling between the above mentioned instabilities and experimental investigation of unstable flow features such as pinching and coalescence of the wetting phase. Initiation of damage induced due to evolving drainage finger is also of particular interest in the context of earlier mentioned applications

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7

Dupuis, Victor. "Étude expérimentale d’écoulements soumis à une transition longitudinale de rugosité en lit simple et en lit composé." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1154/document.

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Ce travail de thèse s'intéresse à l'effet d'une variation longitudinale de l'occupation du sol de la plaine d'inondation sur l'écoulement d'une rivière en débordement. Nous traitons le cas d'une transition entre une zone de prairie et une zone de forêt, et vice versa. Cette variation d'occupation du sol est associée à une transition de rugosité hydraulique entre une rugosité de fond (prairie fortement immergée) et des macro-rugosités émergées (arbres), modélisées respectivement par une moquette plastifiée et par un champ de cylindres. Ces écoulements sont étudiés en laboratoire dans un canal de dimension 18 m x 3 m. Dans un premier temps, nous considérons l'écoulement à travers un champ de cylindres émergents en lit simple, en étudiant l'effet du fond sur le sillage des cylindres et le phénomène de seiche (fortes oscillations de la surface libre). Dans un deuxième temps, nous nous penchons sur le développement vers l'uniformité d'un écoulement en lit composé de rugosité uniforme. La croissance asymétrique de la couche de mélange du lit composé, la propriété d'autosimilarité ainsi que l'organisation tridimensionnelle des structures turbulentes cohérentes associées à la couche de mélange sont analysées. Le troisième temps fait l'objet de la transition longitudinale de rugosité en lit composé, dont l'effet sur la couche de mélange et sur les structures cohérentes est discuté. Nous évaluons également les différentes contributions au transfert latéral de quantité de mouvement entre lit mineur et plaine d'inondation par diffusion turbulente, par échange de masse et par les courants secondaires
This PhD thesis investigates the effect of a longitudinal change in floodplain land use on an overflooding river flow. We consider a transition between a meadow and a woodland and vice versa. This change in land use is associated with a change in hydraulic roughness, between a bed roughness (highly submerged meadow) and emergent macro-roughnesses (trees), respectively modelled by a plastic artificial grass and an array of emergent cylinders. The flows are experimentally investigated in an 18 m x 3 m laboratory flume. In a first step, we investigate the flow through a cylinder array in a single channel, focusing on the effect of bed roughness on the cylinder wakes and on the seiche phenomenon (strong free surface oscillations). In a second step, we study the development towards flow uniformity of compound channel flows with a uniform hydraulic roughness on the floodplains. The asymmetrical growth of the compound channel mixing layer, the self-similarity property and the three-dimensional organisation of the turbulent coherent structures associated with the mixing layer are analysed. In a third step, we investigate the longitudinal change in roughness in compound channel configuration, which effects on mixing layer and on coherent structures are discussed. We also assess the contributions to lateral transfers of momentum between main channel and floodplain by turbulent diffusion, by mass exchange and by secondary currents

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8

Tenny, Joseph S. "Numerical Simulations in Electro-osmotic Flow." BYU ScholarsArchive, 2004. https://scholarsarchive.byu.edu/etd/186.

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The developing flow field in a parallel plate microchannel, induced by wall motion, has been modeled numerically. This type of flow simulates the physical driving mechanism that exists in electro-osmotically generated flow with large channel diameter-to-Debye length ratios (Z). The physics of the flow field were compared between the moving wall model (MWM) and electro-osmotic flow (EOF) at Reynolds numbers of 1 and 1800, and Z > 2500. Also, Z-values between 50 and 500 were studied to investigate the accuracy of the MWM. Results show that for Z-values greater than 100 the MWM shows good agreement with EOF. The dynamics of the developing flow field for the MWM were explored for channel length-to-hydraulic diameter ratios (aspect ratio) of 5, 10, 20 and 40 at ten Reynolds numbers, Re (based on the wall velocity), below Re < 2000. The results show that far from the inlet the maximum fluid velocity occurs at the walls, as is expected, and the minimum velocity occurs at the channel center. Near the channel inlet, however, the centerline velocity is not a minimum but reaches a local maximum due to a resulting pressure imbalance generated by the wall motion. As the aspect ratio increases, the centerline velocity tends to approach the wall velocity far downstream from the inlet. Increases in the Reynolds number have the opposite effect on the centerline velocity. The hydrodynamic developing region, defined by that section of the channel where the wall shear stress is changing, also depends on the channel aspect ratio and Re, and is greater than the developing region for classical pressure-driven flow of a parallel plate channel. Also, the flow field physics was analyzed for a process called electro-mobility focusing (EMF). EMF is a process that separates and detects species of like charge with the use of electro-phoresis and EOF utilizing a varying voltage gradient. The velocity distribution and the effective diffusion were solved for analytically, for both a linear and non-linear voltage gradient, using the MWM and the creeping flow approximations. The resulting equations aid in optimizing the detection system by forcing the lowest effective diffusion (uniform velocity profile) to the detection location.

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9

Tsai, Meng-fang, and 蔡孟芳. "Effect of non-uniform solid particles on rheological parameters of a Bingham fluid." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/80020302569303970669.

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碩士
國立成功大學
水利及海洋工程學系碩博士班
97
Carbopol 940 powder is mixed with tape water to form Carbopol slurry that has Bingham-fluid rheological properties. The Carbopol slurry is mixed with glass spheres to form a particle-slurry mixture that still has Bingham-fluid properties. The effects of the size and the content of the glass spheres on the Bingham-fluid parameters such as the Bingham yield stress and the Bingham viscosity are studied in the present study. We use the 4 diameters glass spheres, which were 1mm, 2mm, 5mm, 10mm, respectively. The experiments were mixed uniform and non- uniform particles into the Carbopol slurry. In uniform particles experiments, the four diameters spheres were add into the slurries with different content. The results showed the gravels size and content of Carbopol slurries affects the Bingham-fluid parameters. Bingham yield stress and Bingham viscosity were increased with particle content, and the increments of rheological parameters were significant with small particle diameters. In non- uniform particles experiments, we blend five sets particles with two diameters gravel into the Carbopol slurries, the experimental results show that particle size distribution and content ratio affect the rheological parameters. The increments of Bingham yield stress and Bingham viscosity were decreased while the maximum packing concentrations of Carbopol particle-slurries were increased.

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10

Cruz-Fierro, Carlos Francisco. "Coupled momentum and heat transport in laminar axisymmetric pipe flow of ferrofluids in non-uniform magnetic fields : theory and simulation." Thesis, 2003. http://hdl.handle.net/1957/31656.

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The effect of a non-uniform magnetic field on the coupled transport of momentum and heat is studied for the case of laminar pipe flow of a magnetically susceptible ferrofluid. The momentum and heat transport equations are complemented with the necessary electromagnetic terms and used to develop a computer simulation of the velocity profile and temperature distribution in the fluid. Two magnetic field configurations are studied. The first configuration is produced by a single short solenoid, located around the pipe. The magnetic field produced has both radial and axial components. For the second configuration, the electric current is inverted in one half of the solenoid, creating much stronger field gradients in both directions. The flow is laminar, driven by a constant pressure difference between the ends of the pipe. The apparent viscosity of the ferrofluid is modeled as dependent on temperature and magnetic field. In simulations involving heat transfer, a section of the pipe is maintained at higher constant temperature. The rest of the wall is adiabatic. A Visual-Basic code, FiRMa (Flow in Response to Magnetic field), was developed to perform the numerical simulations. For the water-based ferrofluid, results show reduction of average velocity and small deviations from the parabolic velocity profile as the result of vortex viscosity. Heat transfer calculations show a decrease in the heat transfer coefficient and an increase in the fluid exit temperature. These effects are due to the change in flow pattern and average velocity. Current research aims for the development of a stable liquid-metal based ferrofluid, because of the high electric and thermal conductivities. The FiRMa code is used to examine the expected response of a mercury-based ferrofluid to the magnetic fields under study. Results show that the electromagnetic effects on the liquid metal-based ferrofluid are much stronger, due to induced electric currents and the Lorentz force acting on them.
Graduation date: 2003

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Частини книг з теми "Non-uniform fluid"

1

Yanwen, Ma, and Fu Dexun. "Difference Approximation on Non-Uniform Mesh and Applications." In Computational Fluid Dynamics 2002, 795–96. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-59334-5_131.

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2

Hafez, Mohamed, and Essam Wahba. "Numerical Simulations of Sonic Booms in Non-uniform Flows." In Computational Fluid Dynamics 2002, 617–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-59334-5_93.

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3

Atzeni, Paolo, Francesca Bugiotti, and Luca Rossi. "Uniform Access to Non-relational Database Systems: The SOS Platform." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 160–74. Cham: Springer International Publishing, 2012. http://dx.doi.org/10.1007/978-3-642-31095-9_11.

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4

Men’shov, Igor, and Yoshiaki Nakamura. "An Accurate Method for Computing Propagation of Sound Waves in Non-Uniform Moving Fluid." In Computational Fluid Dynamics 2000, 549–54. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-56535-9_83.

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5

Stiebler, Maik, Sören Freudiger, Manfred Krafczyk, and Martin Geier. "Parallel Lattice-Boltzmann Simulation of Transitional Flow on Non-uniform Grids." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 283–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-17770-5_21.

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6

Cisonni, Julien, Anthony D. Lucey, and Novak S. J. Elliott. "Stability of a Cantilevered Flexible Plate with Non-uniform Thickness in Viscous Channel Flow." In Fluid-Structure-Sound Interactions and Control, 333–37. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-48868-3_53.

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7

Bakhtiyarov, Sayavur I. "Topic FM-6: Kinematics of Fluid Motion and Streamline Coordinates (Unsteady Non-Uniform Flow)." In Solving Practical Engineering Mechanics Problems: Fluid Mechanics, 21–22. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-031-79697-5_6.

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Volchenko, Dmytry, Vasiliy Skripnik, Dmitry Zhuravlev, Yaroslav Savchyn, and Mykhailo Savchyn. "Non-uniform Nanocapillary Fluid Cooling of the Drawworks’ Band-Shoe Brake Friction Couples." In Lecture Notes in Mechanical Engineering, 584–93. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-16651-8_55.

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9

Gushchin, Valentin A., and Vasilii G. Kondakov. "One Solution of Task with Internal Flow in Non-uniform Fluid Using CABARET Method." In Large-Scale Scientific Computing, 117–23. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-97549-4_13.

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van Buren, Simon, and Wolfgang Polifke. "Heat Transfer in Pulsating Flow and Its Impact on Temperature Distribution and Damping Performance of Acoustic Resonators." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 97–111. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_6.

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Анотація:

Abstract A numerical framework for the prediction of acoustic damping characteristics is developed and applied to a quarter-wave resonator with non-uniform temperature. The results demonstrate a significant impact of the temperature profile on the damping characteristics and hence the necessity of accurate modeling of heat transfer in oscillating flow. Large Eddy Simulations are applied to demonstrate and quantify enhancement in heat transfer induced by pulsations. The study covers wall-normal heat transfer in pulsating flow as well as longitudinal convective effects in oscillating flow. A discussion of hydrodynamic and thermal boundary layers provides insight into the flow physics of oscillatory convective heat transfer.

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Тези доповідей конференцій з теми "Non-uniform fluid"

1

McRae, Oliver, Alexandros Oratis, and James Bird. "Poster: Viscous wrinkling of non-uniform sheets." In 73th Annual Meeting of the APS Division of Fluid Dynamics. American Physical Society, 2020. http://dx.doi.org/10.1103/aps.dfd.2020.gfm.p0027.

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2

Zheng, Ting-hui, Georgios Vatistas, and Alex Povitsky. "Sound Generation by Street of Vortices in a Non-Uniform Flow." In 35th AIAA Fluid Dynamics Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.2005-5160.

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3

Zhuo, Congshan, Chengwen Zhong, Kai Li, and Jianfei Xie. "Lattice Boltzmann Method on Non-Uniform Body-Fitted Mesh: Flow Around an Airfoil." In 19th AIAA Computational Fluid Dynamics. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2009. http://dx.doi.org/10.2514/6.2009-3876.

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4

Povitsky, Alex. "High-order compact simulation of wave propagation in a non-uniform flow." In 15th AIAA Computational Fluid Dynamics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2001. http://dx.doi.org/10.2514/6.2001-2628.

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5

Hellum, Aren M., Ranjan Mukherjee, and Andrew J. Hull. "Dynamics of Pipes Conveying Fluid With a Non-Uniform Velocity Profile." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-12858.

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Previous work on stability of fluid-conveying cantilever pipes assumed a uniform velocity profile for the conveyed fluid. In real fluid flows, the presence of viscosity leads to a sheared region near the wall. Earlier studies correctly note that viscous forces drop out of the system’s dynamics since the force of fluid shear on the wall is precisely balanced by pressure drop in the conveyed fluid. The effect of shear has therefore not been ignored in these studies. However, a uniform velocity profile assumes that the sheared region is infinitely thin. Prior analysis was extended to account for a fully developed non-uniform profile such as would be encountered in real fluid flows. A modified equation of motion was derived to account for the reduced momentum carried by the sheared fluid. Numerical analysis was carried out to determine a number of velocity profiles over the Reynolds number range of interest and a simple set of curve fits was used when finer discretization was required. Stability analysis of a pipe conveying fluid with these profiles was performed, and the results were compared to a uniform profile. The mass ratio, β, is the ratio of the fluid mass to the total system mass. At β = 0.2, the non-uniform case becomes unstable at a critical velocity, ucr, that is 5.4% lower than the uniform case. The critical frequency, fcr, is 0.36% higher than the uniform case. A more sensitive region exists near β = 0.32. There, the nonuniform velocity ucr is 23% lower than the uniform case and the non-uniform critical frequency fcr is 49% of the uniform case.

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6

MOORE, C., and J. SCHETZ. "Effects of non-uniform velocity profiles on dual jets in a crossflow." In 18th Fluid Dynamics and Plasmadynamics and Lasers Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1985. http://dx.doi.org/10.2514/6.1985-1674.

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7

Freret, Lucie, and Clinton P. Groth. "Anisotropic Non-Uniform Block-Based Adaptive Mesh Refinement for Three-Dimensional Inviscid and Viscous Flows." In 22nd AIAA Computational Fluid Dynamics Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2015. http://dx.doi.org/10.2514/6.2015-2613.

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8

Prasad, K. Maruthi, and Prabhaker Reddy Yasa. "Effect of non-Newtonian fluid flow through a permeable non-uniform tube having multiple stenoses." In INTERNATIONAL CONFERENCE ON MATHEMATICAL SCIENCES AND APPLICATIONS (ICMSA-2019). AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0014418.

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9

Wu, S., R. D. Chippendale, P. L. Lewin, J. Hemrle, and L. Kaufmann. "Bubble motion in high voltage thermosyphon fluid under non-uniform electric field." In 2017 IEEE Electrical Insulation Conference (EIC). IEEE, 2017. http://dx.doi.org/10.1109/eic.2017.8004703.

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10

Karandeniya, Dinushika, David Holmes, Emilie Sauret, and Yuantong Gu. "Numerical Study of the Flow Behaviour of Discocyte Red Blood Cell Through a Non-uniform Capillary." In 22nd Australasian Fluid Mechanics Conference AFMC2020. Brisbane, Australia: The University of Queensland, 2020. http://dx.doi.org/10.14264/99dec0a.

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