Articles de revues : « Non-Newtonian dynamics »

1

Allen, John, et Ronald A. Roy. « Bubble dynamics in non‐Newtonian fluids ». Journal of the Acoustical Society of America 103, n^o 5 (mai 1998) : 3013. http://dx.doi.org/10.1121/1.422486.

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Ioannou, Nikolaos, Haihu Liu, Mónica Oliveira et Yonghao Zhang. « Droplet Dynamics of Newtonian and Inelastic Non-Newtonian Fluids in Conﬁnement ». Micromachines 8, n^o 2 (15 février 2017) : 57. http://dx.doi.org/10.3390/mi8020057.

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3

Sarman, Sten S., Denis J. Evans et Peter T. Cummings. « Recent developments in non-Newtonian molecular dynamics ». Physics Reports 305, n^o 1-2 (novembre 1998) : 1–92. http://dx.doi.org/10.1016/s0370-1573(98)00018-0.

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Hanley, H. J. M., et D. J. Evans. « Non-newtonian molecular dynamics and thermophysical properties ». International Journal of Thermophysics 11, n^o 2 (mars 1990) : 381–98. http://dx.doi.org/10.1007/bf01133569.

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5

Brujan, Emil-Alexandru. « Cavitation bubble dynamics in non-Newtonian fluids ». Polymer Engineering & ; Science 49, n^o 3 (15 décembre 2008) : 419–31. http://dx.doi.org/10.1002/pen.21292.

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Denn, Morton M. « Fifty years of non-Newtonian fluid dynamics ». AIChE Journal 50, n^o 10 (2004) : 2335–45. http://dx.doi.org/10.1002/aic.10357.

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7

Gorin, Benjamin, Gabrielle Di Mauro, Daniel Bonn et Hamid Kellay. « Universal Aspects of Droplet Spreading Dynamics in Newtonian and Non-Newtonian Fluids ». Langmuir 38, n^o 8 (18 février 2022) : 2608–13. http://dx.doi.org/10.1021/acs.langmuir.1c03288.

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Binesh, A. R., S. M. Mousavi et R. Kamali. « Effect of temperature-dependency of Newtonian and non-Newtonian fluid properties on the dynamics of droplet impinging on hot surfaces ». International Journal of Modern Physics C 26, n^o 09 (22 juin 2015) : 1550106. http://dx.doi.org/10.1142/s0129183115501065.

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In the present work, three-dimensional computational fluid dynamics analysis is employed to study the droplet dynamics of Newtonian and non-Newtonian droplets impinging on a hot surface under various impact conditions. The Navier–Stokes equations for unsteady, incompressible, and viscous fluid flow are solved using a control volume method. The volume-of-fluid (VOF) technique is also used to track the free-surface of the liquid. The effect of viscosity, density and surface tension on droplet dynamics is evaluated considering their dependence of temperature. The results indicate that the temperature dependence of the both Newtonian and non-Newtonian physicochemical liquid properties must be considered to obtain better agreement of the numerical results with experimental data. After ensuring the accuracy of the numerical methodology, the internal behavior of the droplets is examined, which is shown that the receding velocity of the non-Newtonian droplet is slower than the Newtonian one.

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Rasor, Ned S. « Note on non-Newtonian dynamics in deep space. » Physics Essays 22, n^o 2 (1 juin 2009) : 190–94. http://dx.doi.org/10.4006/1.3124463.

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Rubio, G., et P. Salgado. « Modified Newtonian dynamics and non-relativistic ChSAS gravity ». Physics Letters B 787 (décembre 2018) : 30–35. http://dx.doi.org/10.1016/j.physletb.2018.10.028.

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Zvyagin, V. G., et S. K. Kondrat'ev. « Attractors of equations of non-Newtonian fluid dynamics ». Russian Mathematical Surveys 69, n^o 5 (31 octobre 2014) : 845–913. http://dx.doi.org/10.1070/rm2014v069n05abeh004918.

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Lorenz, Maike, Nicole Marheineke et Raimund Wegener. « Asymptotics and numerics for non-Newtonian jet dynamics ». PAMM 13, n^o 1 (29 novembre 2013) : 515–16. http://dx.doi.org/10.1002/pamm.201310250.

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Pleiner, Harald, Mario Liu et Helmut R. Brand. « Nonlinear fluid dynamics description of non-Newtonian fluids ». Rheologica Acta 43, n^o 5 (17 avril 2004) : 502–8. http://dx.doi.org/10.1007/s00397-004-0365-8.

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De Kee and, D., C. F. Chan Man Fong et J. Yao. « Bubble Shape in Non-Newtonian Fluids ». Journal of Applied Mechanics 69, n^o 5 (16 août 2002) : 703–4. http://dx.doi.org/10.1115/1.1480822.

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The study of the behavior of bubbles in complex fluids is of industrial as well as of academic importance. Bubble velocity-volume relations, bubble shapes, as well as viscous, elastic, and surfactant effects play a role in bubble dynamics. In this note we extend the analysis of Richardson to a non-Newtonian fluid.

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Xu, X. Y., et M. W. Collins. « Studies of Blood Flow in Arterial Bifurcations Using Computational Fluid Dynamics ». Proceedings of the Institution of Mechanical Engineers, Part H : Journal of Engineering in Medicine 208, n^o 3 (septembre 1994) : 163–75. http://dx.doi.org/10.1243/pime_proc_1994_208_282_02.

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The local blood flow in arteries, especially at bends and bifurcations, is correlated with the distribution of atherosclerotic lesions. The flow is three-dimensional, unsteady and difficult to measure in vivo. In this paper a numerical treatment of blood flow in general three-dimensional arterial bifurcations is presented. The flow is assumed to be laminar and incompressible, the blood non-Newtonian and the vessel wall rigid. The three-dimensional time-dependent Navier-Stokes equations are employed to describe the flow, and a newly developed computational fluid dynamics (CFD) code AST EC based on finite volume methods is used to solve the equations. A comprehensive range of code validations has been carried out. Good agreement between numerical predictions and in vitro model data is demonstrated, but the correlation with in vivo measurements is less satisfactory. Effects of the non-Newtonian viscosity have also been investigated. It is demonstrated that differences between Newtonian and non-Newtonian flows occur mainly in regions of flow separation. With the non-Newtonian fluid, the duration of flow separation is shorter and the reverse flow is weaker. Nevertheless, it does not have significant effects on the basic features of the flow field. As for the magnitude of wall shear stress, the effect of non-Newtonian viscosity might not be negligible.

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Ahmed, Bushra A. « Newtonian and modified newtonian gravitational simulation of spiral galaxies ». Iraqi Journal of Physics (IJP) 11, n^o 21 (24 février 2019) : 20–27. http://dx.doi.org/10.30723/ijp.v11i21.363.

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One of the most powerful tools for any stellar dynamics is the N-body simulation. In an N-body simulation the motion of N particles is followed under their mutual gravitational attraction. In this paper the gravitational N-body simulation is described to investigate Newtonian and non- Newtonian (modified Newtonian dynamics) interaction between the stars of spiral galaxies. It is shown that standard Newtonian interaction requires dark matter to produce the flat rotational curves of the systems under consideration, while modified Newtonian dynamics (MOND) theorem provides a flat rotational curve and gives a good agreement with the observed rotation curve; MOND was tested as an alternative to the dark matter hypothesis. So that MOND hypothesis has generated better rotation curves than Newtonian theorem.

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Khizbullina, S. F. « Mathematical model of anomalous thermoviscous non-newtonian fluid dynamics in a circular pipe ». Proceedings of the Mavlyutov Institute of Mechanics 9, n^o 2 (2012) : 139–42. http://dx.doi.org/10.21662/uim2012.2.065.

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On the basis of the continuum dynamics equations the mathematical model of evolution of an incompressible fluid flow in a circular pipe is developed taking into account non-newtonian properties of fluid and non-monotone viscosity dependence on temperature. The qualitative flow picture of anomalous thermoviscous non-newtonian fluid is similar to the flow picture of the anomalous thermoviscous newtonian fluid. Existence of viscosity anomaly leads to reduction of fluid hydraulic resistance.

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Hachmon, Guy, Noam Mamet, Sapir Sasson, Tal Barkai, Nomi Hadar, Almogit Abu-Horowitz et Ido Bachelet. « A Non-Newtonian Fluid Robot ». Artificial Life 22, n^o 1 (février 2016) : 1–22. http://dx.doi.org/10.1162/artl_a_00194.

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New types of robots inspired by biological principles of assembly, locomotion, and behavior have been recently described. In this work we explored the concept of robots that are based on more fundamental physical phenomena, such as fluid dynamics, and their potential capabilities. We report a robot made entirely of non-Newtonian fluid, driven by shear strains created by spatial patterns of audio waves. We demonstrate various robotic primitives such as locomotion and transport of metallic loads—up to 6-fold heavier than the robot itself—between points on a surface, splitting and merging, shapeshifting, percolation through gratings, and counting to 3. We also utilized interactions between multiple robots carrying chemical loads to drive a bulk chemical synthesis reaction. Free of constraints such as skin or obligatory structural integrity, fluid robots represent a radically different design that could adapt more easily to unfamiliar, hostile, or chaotic environments and carry out tasks that neither living organisms nor conventional machines are capable of.

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Kotschote, Matthias. « Dynamics of Compressible Non-isothermal Fluids of Non-Newtonian Korteweg Type ». SIAM Journal on Mathematical Analysis 44, n^o 1 (janvier 2012) : 74–101. http://dx.doi.org/10.1137/110821202.

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Liu, Linfang, Tomás Caraballo et Xianlong Fu. « Dynamics of a non-autonomous incompressible non-Newtonian fluid with delay ». Dynamics of Partial Differential Equations 14, n^o 4 (2017) : 375–402. http://dx.doi.org/10.4310/dpde.2017.v14.n4.a4.

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Birs, Isabela, Cristina Muresan, Ovidiu Prodan, Silviu Folea et Clara Ionescu. « An Experimental Approach towards Motion Modeling and Control of a Vehicle Transiting a Non-Newtonian Environment ». Fractal and Fractional 5, n^o 3 (25 août 2021) : 104. http://dx.doi.org/10.3390/fractalfract5030104.

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The present work tackles the modeling of the motion dynamics of an object submerged in a non-Newtonian environment. The mathematical model is developed starting from already known Newtonian interactions between the submersible and the fluid. The obtained model is therefore altered through optimization techniques to describe non-Newtonian interactions on the motion of the vehicle by using real-life data regarding non-Newtonian influences on submerged thrusting. For the obtained non-Newtonian fractional order process model, a fractional order control approach is employed to sway the submerged object’s position inside the viscoelastic environment. The presented modeling and control methodologies are solidified by real-life experimental data used to validate the veracity of the presented concepts. The robustness of the control strategy is experimentally validated on both Newtonian and non-Newtonian environments.

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Hersey, Eric, Mauro Rodriguez et Eric Johnsen. « Dynamics of an oscillating microbubble in a blood-like Carreau fluid ». Journal of the Acoustical Society of America 153, n^o 3 (mars 2023) : 1836–45. http://dx.doi.org/10.1121/10.0017342.

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A numerical model for cavitation in blood is developed based on the Keller–Miksis equation for spherical bubble dynamics with the Carreau model to represent the non-Newtonian behavior of blood. Three different pressure waveforms driving the bubble oscillations are considered: a single-cycle Gaussian waveform causing free growth and collapse, a sinusoidal waveform continuously driving the bubble, and a multi-cycle pulse relevant to contrast-enhanced ultrasound. Parameters in the Carreau model are fit to experimental measurements of blood viscosity. In the Carreau model, the relaxation time constant is 5–6 orders of magnitude larger than the Rayleigh collapse time. As a result, non-Newtonian effects do not significantly modify the bubble dynamics but do give rise to variations in the near-field stresses as non-Newtonian behavior is observed at distances 10–100 initial bubble radii away from the bubble wall. For sinusoidal forcing, a scaling relation is found for the maximum non-Newtonian length, as well as for the shear stress, which is 3 orders of magnitude larger than the maximum bubble radius.

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Mohammad Karim, Alireza. « Experimental dynamics of Newtonian and non-Newtonian droplets impacting liquid surface with different rheology ». Physics of Fluids 32, n^o 4 (1 avril 2020) : 043102. http://dx.doi.org/10.1063/1.5144426.

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Bašić, Martina, Branko Blagojević, Chong Peng et Josip Bašić. « Lagrangian Differencing Dynamics for Time-Independent Non-Newtonian Materials ». Materials 14, n^o 20 (19 octobre 2021) : 6210. http://dx.doi.org/10.3390/ma14206210.

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This paper introduces a novel meshless and Lagrangian approach for simulating non-Newtonian flows, named Lagrangian Differencing Dynamics (LDD). Second-order-consistent spatial operators are used to directly discretize and solve generalized Navier–Stokes equations in a strong formulation. The solution is obtained using a split-step scheme, i.e., by decoupling the solutions of the pressure and velocity. The pressure is obtained by solving a Poisson equation, and the velocity is solved in a semi-implicit formulation. The matrix-free solution to the equations, and Lagrangian advection of mesh-free nodes allowed for a fully parallelized implementation on the CPU and GPU, which ensured an affordable computing time and large time steps. A set of four benchmarks are presented to demonstrate the robustness and accuracy of the proposed formulation. The tested two- and three-dimensional simulations used Power Law, Casson and Bingham models. An Abram slump test and a dam break test were performed using the Bingham model, yielding visual and numerical results in accordance with the experimental data. A square lid-driven cavity was tested using the Casson model, while the Power Law model was used for a skewed lid-driven cavity test. The simulation results of the lid-driven cavity tests are in good agreement with velocity profiles and stream lines of published reports. A fully implicit scheme will be introduced in future work. As the method precisely reproduces the pressure field, non-Newtonian models that strongly depend on the pressure will be validated.

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Golubyatnikov, A. N., et D. V. Ukrainskii. « Dynamics of a Spherical Bubble in Non-Newtonian Liquids ». Fluid Dynamics 56, n^o 4 (17 juin 2021) : 492–502. http://dx.doi.org/10.1134/s0015462821040078.

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Rasor, Ned S. « Note on a physical basis for non-Newtonian dynamics ». Physics Essays 22, n^o 1 (mars 2009) : 41–43. http://dx.doi.org/10.4006/1.3073835.

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IKEGAMI, Hiroyuki, Takehiro YAMAMOTO et Kiyoji NAKAMURA. « Interface Dynamics of Viscous Fingers in Non-Newtonian Fluids ». Proceedings of Conference of Kansai Branch 2002.77 (2002) : _13–53_—_13–54_. http://dx.doi.org/10.1299/jsmekansai.2002.77._13-53_.

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Li, Huai Z., Youssef Mouline et Noël Midoux. « Modelling the bubble formation dynamics in non-Newtonian fluids ». Chemical Engineering Science 57, n^o 3 (février 2002) : 339–46. http://dx.doi.org/10.1016/s0009-2509(01)00394-3.

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Johnson, Shirley J., Andrew J. Salem et Gerald G. Fuller. « Dynamics of colloidal particles in sheared, non-Newtonian fluids ». Journal of Non-Newtonian Fluid Mechanics 34, n^o 1 (janvier 1990) : 89–121. http://dx.doi.org/10.1016/0377-0257(90)80013-p.

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KOPLIK, JOEL, et JAYANTH R. BANAVAR. « MOLECULAR DYNAMICS SIMULATIONS OF NON-NEWTONIAN EXTENSIONAL FLUID FLOWS ». International Journal of Modern Physics B 17, n^o 01n02 (20 janvier 2003) : 27–32. http://dx.doi.org/10.1142/s0217979203017047.

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We discuss the use of molecular dynamics computer simulations in the extensional flow dynamics of polymeric, non-Newtonian liquids. The molecular model consists of Lennard-Jones monomers bound into linear chains by FENE potentials, a system known to exhibit characteristic non-Newtonian behavior such as shear thinning and normal stress differences. Here, we simulate liquid bridge flows in which cylinders of such liquids are placed between solid plates and extended to the point of rupture. Measurements of the local fluid stress tensor and interface shape provide information on extensional viscosity and rheology, coupled to microscopic information based on the evolution of molecular configurations. The simulations are in good agreement with laboratory data and with the results of macroscopic numerical calculations where available, but provide new and detailed information on the internal dynamics of liquids in extensional flow.

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Malkus, David S., John A. Nohel et Bradley J. Plohr. « Dynamics of shear flow of a non-Newtonian fluid ». Journal of Computational Physics 87, n^o 2 (avril 1990) : 464–87. http://dx.doi.org/10.1016/0021-9991(90)90261-x.

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Qiu, Pei-Tao, Zhan-Qing Chen, Hai Pu et Lian-Ying Zhang. « Non-Darcian seepage stability analysis of non-Newtonian fluid ». Thermal Science 23, n^o 3 Part A (2019) : 1393–99. http://dx.doi.org/10.2298/tsci180721203q.

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In this paper, the two-phase fluid composed of fine geologic particles and water is considered to be a non-Newtonian fluid, and the seepage dynamics model of the two-phase medium in the rock-soil structure is constructed. Based on the hypothesis, the boundary conditions and solving methods of the model are given and the critical conditions of the model instability are also discussed in detail. It is shown that the existence of the equilibrium state of the kinetic model is determined by the power exponent, the effective fluidity and the non-Darcian flow factor.

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Oke, Abayomi S., Winifred N. Mutuku, Mark Kimathi et Isaac L. Animasaun. « Insight into the dynamics of non-Newtonian Casson fluid over a rotating non-uniform surface subject to Coriolis force ». Nonlinear Engineering 9, n^o 1 (13 octobre 2020) : 398–411. http://dx.doi.org/10.1515/nleng-2020-0025.

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AbstractCasson fluid model is the most accurate mathematical expression for investigating the dynamics of fluids with non-zero plastic dynamic viscosity like that of blood. Despite huge number of published articles on the transport phenomenon, there is no report on the increasing effects of the Coriolis force. This report presents the significance of increasing not only the Coriolis force and reducing plastic dynamic viscosity, but also the Prandtl number and buoyancy forces on the motion of non-Newtonian Casson fluid over the rotating non-uniform surface. The relevant body forces are derived and incorporated into the Navier-Stokes equations to obtain appropriate equations for the flow of Newtonian Casson fluid under the action of Coriolis force. The governing equations are non-dimensionalized using Blasius similarity variables to reduce the nonlinear partial differential equations to nonlinear ordinary differential equations. The resulting system of nonlinear ordinary differential equations is solved using the Runge-Kutta-Gills method with the Shooting technique, and the results depicted graphically. An increase in Coriolis force and non-Newtonian parameter decreases the velocity profile in the x-direction, causes a dual effect on the shear stress, increases the temperature profiles, and increases the velocity profile in the z-direction.

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Manisha Patel, Hema Surati et M. G. Timol. « Extension of Blasius Newtonian Boundary Layer to Blasius Non-Newtonian Boundary Layer ». Mathematical Journal of Interdisciplinary Sciences 9, n^o 2 (8 juin 2021) : 35–41. http://dx.doi.org/10.15415/mjis.2021.92004.

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Blasius equation is very well known and it aries in many boundary layer problems of fluid dynamics. In this present article, the Blasius boundary layer is extended by transforming the stress strain term from Newtonian to non-Newtonian. The extension of Blasius boundary layer is discussed using some non-newtonian fluid models like, Power-law model, Sisko model and Prandtl model. The Generalised governing partial differential equations for Blasius boundary layer for all above three models are transformed into the non-linear ordinary differewntial equations using the one parameter deductive group theory technique. The obtained similarity solutions are then solved numerically. The graphical presentation is also explained for the same. It concludes that velocity increases more rapidly when fluid index is moving from shear thickninhg to shear thininhg fluid.MSC 2020 No.: 76A05, 76D10, 76M99

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Schlijper, A. G., C. W. Manke, W. G. Madden et Y. Kong. « Computer Simulation of Non-Newtonian Fluid Rheology ». International Journal of Modern Physics C 08, n^o 04 (août 1997) : 919–29. http://dx.doi.org/10.1142/s0129183197000795.

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Dissipative Particle Dynamics (DPD) is a new simulation technique that focuses on intermediate time and length scales. With this technique it is possible to simulate the essential aspects of the rheological behavior of polymeric liquids quite efficiently. Model studies show that DPD reveals the expected shear thinning and normal stress effects. We also show that the effects of thermodynamic solvent quality on the configurations and rheological behavior of dissolved polymers can be studied with the DPD model.

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Valencia, Alvaro A., Amador M. Guzmán, Ender A. Finol et Cristina H. Amon. « Blood Flow Dynamics in Saccular Aneurysm Models of the Basilar Artery ». Journal of Biomechanical Engineering 128, n^o 4 (3 février 2006) : 516–26. http://dx.doi.org/10.1115/1.2205377.

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Blood flow dynamics under physiologically realistic pulsatile conditions plays an important role in the growth, rupture, and surgical treatment of intracranial aneurysms. The temporal and spatial variations of wall pressure and wall shear stress in the aneurysm are hypothesized to be correlated with its continuous expansion and eventual rupture. In addition, the assessment of the velocity field in the aneurysm dome and neck is important for the correct placement of endovascular coils. This paper describes the flow dynamics in two representative models of a terminal aneurysm of the basilar artery under Newtonian and non-Newtonian fluid assumptions, and compares their hemodynamics with that of a healthy basilar artery. Virtual aneurysm models are investigated numerically, with geometric features defined by β=0deg and β=23.2deg, where β is the tilt angle of the aneurysm dome with respect to the basilar artery. The intra-aneurysmal pulsatile flow shows complex ring vortex structures for β=0deg and single recirculation regions for β=23.2deg during both systole and diastole. The pressure and shear stress on the aneurysm wall exhibit large temporal and spatial variations for both models. When compared to a non-Newtonian fluid, the symmetric aneurysm model (β=0deg) exhibits a more unstable Newtonian flow dynamics, although with a lower peak wall shear stress than the asymmetric model (β=23.2deg). The non-Newtonian fluid assumption yields more stable flows than a Newtonian fluid, for the same inlet flow rate. Both fluid modeling assumptions, however, lead to asymmetric oscillatory flows inside the aneurysm dome.

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Al-Azawy, Mohammed Ghalib, Saleem Khalefa Kadhim et Azzam Sabah Hameed. « Newtonian and Non-Newtonian Blood Rheology Inside a Model of Stenosis ». CFD Letters 12, n^o 11 (30 novembre 2020) : 27–36. http://dx.doi.org/10.37934/cfdl.12.11.2736.

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In order to imitate the atherosclerosis artery disease and determine the key issues, Computational Fluid Dynamics (CFD) is able to play a leading rule in the analysis of flow physics within the clogged arteries, in particular the stenosis artery. The problem of blood flow blockage through the blood vessel has been investigated numerically within a stenosis artery. In this work, a CFD technique was employed to solve the three-dimensional, steady, laminar and non-Newtonian Carreau model blood flow through a stenosis artery using Star-CCM+ software. The shape of stenosis that has been selected is a trapezoidal with two cases (70% and 90% blockage). Shear rate, streamlines, vorticity and importance factor are examined to assess the influence of non-Newtonian model through the test section, the Carreau model was compared with Newtonian model. The clinical significance of the shear rate is reported for the examined cases, observing that the levels of non-Newtonian model are predicted to be higher in the 90% blockage than that observed within the 70%; the same finding as related with the axial velocity and vorticity. The levels of re-circulation areas and vorticity are showed to be enlarged in the Carreau model compared with the case of Newtonian.

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Mondal, Pranab Kumar, Debabrata DasGupta et Suman Chakraborty. « Rheology-modulated contact line dynamics of an immiscible binary system under electrical double layer phenomena ». Soft Matter 11, n^o 33 (2015) : 6692–702. http://dx.doi.org/10.1039/c5sm01175b.

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We investigate the electrically-driven contact line dynamics of a binary fluid system constituted by one Newtonian and another non-Newtonian fluid in a narrow fluidic channel with chemically patched walls.

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Chaichana, Thanapong, Zhonghua Sun et James Jewkes. « Computational Fluid Dynamics Analysis of the Effect of Plaques in the Left Coronary Artery ». Computational and Mathematical Methods in Medicine 2012 (2012) : 1–9. http://dx.doi.org/10.1155/2012/504367.

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This study was to investigate the hemodynamic effect of simulated plaques in left coronary artery models, which were generated from a sample patient’s data. Plaques were simulated and placed at the left main stem and the left anterior descending (LAD) to produce at least 60% coronary stenosis. Computational fluid dynamics analysis was performed to simulate realistic physiological conditions that reflect thein vivocardiac hemodynamics, and comparison of wall shear stress (WSS) between Newtonian and non-Newtonian fluid models was performed. The pressure gradient (PSG) and flow velocities in the left coronary artery were measured and compared in the left coronary models with and without presence of plaques during cardiac cycle. Our results showed that the highest PSG was observed in stenotic regions caused by the plaques. Low flow velocity areas were found at postplaque locations in the left circumflex, LAD, and bifurcation. WSS at the stenotic locations was similar between the non-Newtonian and Newtonian models although some more details were observed with non-Newtonian model. There is a direct correlation between coronary plaques and subsequent hemodynamic changes, based on the simulation of plaques in the realistic coronary models.

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Glinski, G. P., C. Bailey et K. A. Pericleous. « A non-Newtonian computational fluid dynamics study of the stencil printing process ». Proceedings of the Institution of Mechanical Engineers, Part C : Journal of Mechanical Engineering Science 215, n^o 4 (1 avril 2001) : 437–46. http://dx.doi.org/10.1243/0954406011520869.

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This paper describes the application of computational fluid dynamics (CFD) to simulate the macroscopic bulk motion of solder paste ahead of a moving squeegee blade in the stencil printing process during the manufacture of electronic components. The successful outcome of the stencil printing process is dependent on the interaction of numerous process parameters. A better understanding of these parameters is required to determine their relation to print quality and improve guidelines for process optimization. Various modelling techniques have arisen to analyse the flow behaviour of solder paste, including macroscopic studies of the whole mass of paste as well as microstructural analyses of the motion of individual solder particles suspended in the carrier fluid. This work builds on the knowledge gained to date from earlier analytical models and CFD investigations by considering the important non-Newtonian rheological properties of solder pastes which have been neglected in previous macroscopic studies. Pressure and velocity distributions are obtained from both Newtonian and non-Newtonian CFD simulations and evaluated against each other as well as existing established analytical models. Significant differences between the results are observed, which demonstrate the importance of modelling non-Newtonian properties for realistic representation of the flow behaviour of solder paste.

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Mann, K. A., S. Deutsch, J. M. Tarbell, D. B. Geselowitz, G. Rosenberg et W. S. Pierce. « An Experimental Study of Newtonian and Non-Newtonian Flow Dynamics in a Ventricular Assist Device ». Journal of Biomechanical Engineering 109, n^o 2 (1 mai 1987) : 139–47. http://dx.doi.org/10.1115/1.3138656.

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The fluid dynamic behavior of a Newtonian water/glycerol solution, a non-Newtonian polymer (separan) solution, and bovine blood were compared in the Penn State Electrical Ventricular Assist Device (EVAD). Pulsed doppler ultrasound velocimetry was used to measure velocities in the near wall region (0.95–2.7 mm) along the perimeter of the pump. Mean velocity, turbulence intensity, local and convective acceleration, and shear rate were calculated from the PDU velocity measurements. Flow visualization provided qualitative information about the general flow patterns in the EVAD. Results indicate that water/glycerol does not accurately model the flow characteristics of bovine blood in the EVAD. The non-Newtonian separan solution produced results closer to those of the bovine blood than did the water/glycerol solution. Near wall velocity magnitudes for the separan were similar to those of the bovine blood, but the profile shapes differed for portions of the pump cycle. All three fluids exhibited periods of stagnation. Bovine blood results indicated the presence of a desired rotational washout pattern at mid-systole, while results with the other fluids did not show this feature.

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el Gibaly, Ahmed, Omar A. El-Bassiouny, Omar Diaa, Ali I. Shehata, Tamer Hassan et Khalid M. Saqr. « Effects of Non-Newtonian Viscosity on the Hemodynamics of Cerebral Aneurysms ». Applied Mechanics and Materials 819 (janvier 2016) : 366–70. http://dx.doi.org/10.4028/www.scientific.net/amm.819.366.

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The purpose of this study is to present a comparative study between Newtonian and non-Newtonian blood viscosity models for simulating the hemodynamic wall shear stress (WSS) of cerebral aneurysms. The non-Newtonian blood viscosity was modeled using the Carreau-Yasuda nonlinear model. Two realistic cerebral aneurysm models, derived from 3D angiography imaging, were studied and simulated via computational fluid dynamics solver based on finite volume method, with a pulsating sinusoidal waveform boundary conditions. The maximum wall shear stresses were found at the aneurysm’s neck and apex, the inlet arteriole recorded an average wall shear stress and as for the blebs and tips the wall shear stress values were remarkably low. The comparison indicated that non-Newtonian blood viscosity model predicted a lower range of WSS than of the Newtonian model, which provides more accuracy for simulating aneurysm hemodynamics.

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Mohammad Karim, Alireza, Wieslaw J. Suszynski, Saswati Pujari, Lorraine F. Francis et Marcio S. Carvalho. « Contact line dynamics in curtain coating of non-Newtonian liquids ». Physics of Fluids 33, n^o 10 (octobre 2021) : 103103. http://dx.doi.org/10.1063/5.0064467.

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Fan, Wen Yuan, et Xiao Hong Yin. « Fractal Approach to Bubble Rising Dynamics in Non-Newtonian Fluids ». Advanced Materials Research 889-890 (février 2014) : 559–62. http://dx.doi.org/10.4028/www.scientific.net/amr.889-890.559.

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The Laser Doppler anemometry was employed to determine quantitatively the liquid velocity induced by the successive rising of single bubble in non-Newtonian carboxymethylcellulose (CMC) aqueous solutions under various experimental conditions of mass concentration solutions, measures heights and gas flow rate. The features of liquid motion in the region of bubble rising channel were investigated by analysis the liquid velocity pulsation using fractal theory. The results show that the liquid motion in the channel zone of bubble rise has a special feature of double fraction, and shows strong positive persistence characteristics for a small delay, but the positive persistence characteristics begins to reduce obviously with the increase of the delay, and even presents the anti-persistence for some measured points.

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Wang, X. D., D. J. Lee, X. F. Peng et J. Y. Lai. « Spreading Dynamics and Dynamic Contact Angle of Non-Newtonian Fluids ». Langmuir 23, n^o 15 (juillet 2007) : 8042–47. http://dx.doi.org/10.1021/la0701125.

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Boudaoud, A. « Non-Newtonian thin films with normal stresses : dynamics and spreading ». European Physical Journal E 22, n^o 2 (février 2007) : 107–9. http://dx.doi.org/10.1140/epje/e2007-00026-9.

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Zvyagin, V. G., et V. P. Orlov. « Solvability of one non-Newtonian fluid dynamics model with memory ». Nonlinear Analysis 172 (juillet 2018) : 73–98. http://dx.doi.org/10.1016/j.na.2018.02.012.

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Romeo, Giovanni, Giovanni Filippone, Alberto Fernández-Nieves, Pietro Russo et Domenico Acierno. « Elasticity and dynamics of particle gels in non-Newtonian melts ». Rheologica Acta 47, n^o 9 (18 juin 2008) : 989–97. http://dx.doi.org/10.1007/s00397-008-0291-2.

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Tauviqirrahman, Mohammad, J. Jamari, S. Susilowati, Caecilia Pujiastuti, Budi Setiyana, Ahmad Hafil Pasaribu et Muhammad Imam Ammarullah. « Performance Comparison of Newtonian and Non-Newtonian Fluid on a Heterogeneous Slip/No-Slip Journal Bearing System Based on CFD-FSI Method ». Fluids 7, n^o 7 (2 juillet 2022) : 225. http://dx.doi.org/10.3390/fluids7070225.

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It is a well-known fact that incorporating a slip boundary into the contact surfaces improves bearing performance significantly. Regrettably, no research into the effect of slip on the behavior of journal bearing systems operating with non-Newtonian lubricants has been conducted thus far. The main purpose of this work is to explore the performance comparison of Newtonian and non-Newtonian fluid on a heterogeneous slip/no-slip journal bearing system. The tribological and acoustic behavior of journal bearing is investigated in this study using a rigorous program that combines CFD (computational fluid dynamics) and two-way FSI (fluid–structure interaction) procedures to simulate Newtonian vs. non-Newtonian conditions with and without slip boundary. The numerical results indicate that irrespective of the lubricant type (i.e., Newtonian or non-Newtonian), an engineered heterogeneous slip/no-slip pattern leads to the improvement of the bearing performance (i.e., increased load-carrying capacity, reduced coefficient of friction, and decreased noise) compared to conventional journal bearing. Furthermore, the influence of the eccentricity ratio is discussed, which confirms that the slip beneficial effect becomes stronger as the eccentricity ratio decreases. It has also been noticed that the Newtonian lubricant is preferable for improving tribological performance, whereas non-Newtonian fluid is recommended for lowering bearing noise.

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Khan, Aamir, Rehan Ali Shah, M. Kamran Alam, Sajid Rehman, M. Shahzad, Sohail Almad et M. Sohail Khan. « Flow dynamics of a time-dependent non-Newtonian and non-isothermal fluid between coaxial squeezing disks ». Advances in Mechanical Engineering 13, n^o 7 (juillet 2021) : 168781402110333. http://dx.doi.org/10.1177/16878140211033370.

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The goal of this research is to investigate the behaviours of porosity and squeezing phenomena in the presence of time-dependent heat flow that affect the flow rate and improve the system’s heating/cooling mechanism, reduce non-Newtonian fluid turbulence and scale-up flow tracers. Squeezing discs in the presence of no-slip velocity and convective surface boundary conditions induces a laminar, unstable and incompressible non-Newtonian fluid. The convective form of the momentum, concentration and energy equations are modelled for smooth discs to evaluate and offer an analytical and numerical examination of the flow for heat and mass transfer, which are further transformed to a highly non-linear system of ordinary differential equation using similarity transformations. In the case of smooth disks, the self-similar equations are solved using Homotopy Analysis Method (HAM) with appropriate initial guesses and auxiliary parameters to produce an algorithm with an accelerated and assured convergence. The comparison of HAM solutions with numerical solver programme BVP4 c proves the validity and correctness of HAM results. It is found that increasing or bypassing the Hartman number reduces the capillary region, making the Lorentz force effect more visible for small values of non-Newtonian parameter. The concentration rate at the bottom disc rises rapidly as the thermal diffusivity rises. In addition, because the rate of outflow from the flow domain increases, the suction/injection parameter lowers the radial velocity. Additionally, as the non-Newtonian parameter is increased, skin friction and heat/mass flux rise. In the suction/injection situation, all physical characteristics have the opposite effect on flow field profiles.

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