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Journal articles on the topic 'Viscosity forces'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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1

Joel, Bigley Ed.D*. "CHANGE VISCOSITY." Global Journal of Engineering Science and Research Management 6, no. 7 (2019): 41–56. https://doi.org/10.5281/zenodo.3345121.

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Every organization faces the need for change, but only some will thrive in an environment that requires a disruption. Competitive advantage, or even surviving with a defensible posture, will require that change is both controlled and suitably accelerated using a dispersed leadership cultural attribute. Some organizations spend significant capital to reinvent themselves, execute pre-emptive transformations, or conduct recalibrations. Even though most of these efforts fail to meet expectations, the assumption of a sure position in a market is naïve and fraught with risk. As business success

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2

Mao, Hongfei, Yanli He, Guanglin Wu, Jinbo Lin, and Ran Ji. "Study of Liquid Viscosity Effects on Hydrodynamic Forces on an Oscillating Circular Cylinder Underwater Using OpenFOAM®." Symmetry 13, no. 10 (2021): 1806. http://dx.doi.org/10.3390/sym13101806.

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By neglecting the viscosity of fluid and rotation in flow, the theory of potential flow cannot accurately predict the hydrodynamic forces on the structures under significant viscous effects. In this study, the effects of liquid viscosity on the hydrodynamic forces on a horizontal circular cylinder underwater with a large-amplitude forced oscillation were investigated. The study used a two-dimensional two-phase flow wave tank model based on the viscous fluid theory using the OpenFOAM® package. The numerical calculations were carried out under different types of liquid (i.e., liquid with differe

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Andersen, Pål Østebø, Liva Salomonsen, and Dagfinn Søndenaa Sleveland. "Characteristic Forced and Spontaneous Imbibition Behavior in Strongly Water-Wet Sandstones Based on Experiments and Simulation." Energies 15, no. 10 (2022): 3531. http://dx.doi.org/10.3390/en15103531.

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Forced and spontaneous imbibition of water is performed to displace oil from strongly water-wet Gray Berea (~130 mD) and Bentheimer (~1900 mD) sandstone core plugs. Two nonpolar oils (n-heptane and Marcol-82) were used as a non-wetting phase, with viscosities between 0.4 and 32 cP and brine (1 M NaCl) for the wetting phase with viscosity 1.1 cP. Recovery was measured for both imbibition modes, and pressure drop was measured during forced imbibition. Five forced imbibition tests were performed using low or high injection rates, using low or high oil viscosity. Seventeen spontaneous imbibition e

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4

Byers, John, Denis Cohen, and Neal R. Iverson. "Subglacial clast/bed contact forces." Journal of Glaciology 58, no. 207 (2012): 89–98. http://dx.doi.org/10.3189/2012jog11j126.

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AbstractA laboratory device was built to measure the forces that ice exerts on a 0.05 m diameter rigid plastic sphere in two different configurations: in contact with a flat bed or isolated from the bed. Measurements indicated that bed-normal contact forces were 1.8 times larger than drag forces due to creeping flow past a slippery sphere isolated from the bed. Measurements of forces as a function of the bed-normal ice velocity, estimations of the ice viscosity parameter and observations of markers in the ice indicate ice is Newtonian with a viscosity of ~1.3x 1011 Pas. Newtonian behavior is e

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SHABANOV, Vsevolod Aleksandrovich. "MOTION OF VARIABLE VISCOSITY LIQUIDS IN POROUS MEDIA." Urban construction and architecture 4, no. 3 (2014): 73–76. http://dx.doi.org/10.17673/vestnik.2014.03.13.

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Motion of variable viscosity water drop in perfect soil model is viewed. Resistance forces are presented as amount sum of mass forces and forces depending on water drop speed and liquid viscosity. Resistance forces are ranged in accordance with coordinate and time. Three terms in each range are holded - quadratic terms are presented. It was shown that in this case the equation of the motion has the form of the Riccati equation. The equation factors have been defi ned experimentally. Mathematic model proves that in defi nes conditions water drop is stopped forming a slug.

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Bohiniková, Alžbeta, Iveta Jančigová, and Ivan Cimrák. "Modeling Red Blood Cell Viscosity Contrast Using Inner Soft Particle Suspension." Micromachines 12, no. 8 (2021): 974. http://dx.doi.org/10.3390/mi12080974.

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The inner viscosity of a biological red blood cell is about five times larger than the viscosity of the blood plasma. In this work, we use dissipative particles to enable the proper viscosity contrast in a mesh-based red blood cell model. Each soft particle represents a coarse-grained virtual cluster of hemoglobin proteins contained in the cytosol of the red blood cell. The particle interactions are governed by conservative and dissipative forces. The conservative forces have purely repulsive character, whereas the dissipative forces depend on the relative velocity between the particles. We de

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7

WIERZCHOLSKI, Krzysztof, and Andrzej MISZCZAK. "IMPACT OF ADHESION AND VISCOSITY FORCES ON FRICTION VARIATIONS IN BIO-TRIBOLOGICAL SYSTEMS." Tribologia 278, no. 2 (2018): 139–51. http://dx.doi.org/10.5604/01.3001.0012.6987.

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The classical theory of lubrication holds that the lubricant dynamic viscosity increments cause the increments of hydrodynamic pressure, as well as friction forces and wear. In the case of high values of hydrodynamic pressure, it very often has a significant impact on the friction coefficient. New achievements in the field of micro-and nano-tribology provide for new hypotheses on the decrements and increments of the friction coefficient in the case of the lubricant viscosity increments. Experimental investigations have shown that, even in the case of decrements of the friction coefficient with

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8

Idrees, Shenwar A., Lawand L. Mustafa, and Sabah S. Saleem. "Improvement Viscosity Index of Lubricating Engine Oil Using Low Molecular Weight Compounds." Science Journal of University of Zakho 7, no. 1 (2019): 14–17. http://dx.doi.org/10.25271/sjuoz.2019.7.1.572.

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the effect of polarity of solvent on the viscosity and viscosity index of lubricating engine oil has been studied using ethanol as an example of polar solvent and toluene as an example of non-polar solvent at different solvent ratios and ambient temperature and additionally other experiments have been done at five different temperatures including 100 oC. So that, the activation energy of viscous flow (Ea) was calculated, and for this purpose Arrhenius viscosity-temperature dependence has been applied and the results were 42.128, 29.256 and 35.417KJ/mole for lubricating engine oil mixed with et

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9

Huang, Felix C., James L. Patton, and Ferdinando A. Mussa-Ivaldi. "Manual Skill Generalization Enhanced by Negative Viscosity." Journal of Neurophysiology 104, no. 4 (2010): 2008–19. http://dx.doi.org/10.1152/jn.00433.2009.

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Recent human-machine interaction studies have suggested that movement augmented with negative viscosity can enhance performance and can even promote better motor learning. To test this, we investigated how negative viscosity influences motor adaptation to an environment where forces acted only in one axis of motion. Using a force-feedback device, subjects performed free exploratory movements with a purely inertia generating forces proportional to hand acceleration, negative viscosity generating destabilizing forces proportional to hand velocity, or a combination of the acceleration and velocit

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10

Merriman, T. L., and J. W. Kannel. "Apparatus for Extensional Viscosity Measurements." Journal of Tribology 119, no. 4 (1997): 700–703. http://dx.doi.org/10.1115/1.2833872.

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Although most analyses in tribology deal with the behavior of fluids in shear, many fluids, such as greases or printing inks, can develop significant forces when subjected to pure extension. These forces can impact performance, especially in the exit region of tribological interfaces. The resistance of a fluid to an imposed shear rate is a measure of the fluid’s shear viscosity (usually just referred to as its viscosity). The resistance of a fluid to an imposed extensional strain rate is a measure of the fluid’s extensional viscosity. In this paper, two techniques for the measurement of extens

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11

Wierzcholski, Krzysztof, and Andrzej Miszczak. "Temperature and Adhesion Influence on the Microbearings Operating Parameters." Solid State Phenomena 199 (March 2013): 176–81. http://dx.doi.org/10.4028/www.scientific.net/ssp.199.176.

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In presented paper are elaborated the preliminary problems of thermo-hydrodynamic theory of lubrication for dependences between temperature, adhesive forces, and oil dynamic viscosity, in micro-scale inside super thin cylindrical boundary layer arising between two cooperating grooved cylindrical surfaces. In cylindrical micro-bearings are visible the large gradients of temperature changes and adhesion changes in very thin gap height direction. Hence the oil dynamic viscosity changes significantly in gap height direction. This fact implies the visible oil flow velocity changes and friction forc

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Beresnev, Igor A., and Wen Deng. "Viscosity effects in vibratory mobilization of residual oil." GEOPHYSICS 75, no. 4 (2010): N79—N85. http://dx.doi.org/10.1190/1.3429999.

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The last decade has seen clarifications of the underlying capillary physics behind stimulation of oil production by seismic waves and vibrations. Computational studies have prevailed, however, and no viscous hydrodynamic theory of the phenomenon has been proposed. For a body of oil entrapped in a pore channel, viscosity effects are naturally incorporated through a model of two-phase core-annular flow. These effects are significant at the postmobilization stage, when the resistance of capillary forces is overcome and viscosity becomes the only force resisting an oil ganglion’s motion. A viscous

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Kravtsov, A. "Investigation of the structural viscosity of oil films on the friction surface with fullerene compositions." Problems of tribology 99, no. 1 (2021): 13–19. http://dx.doi.org/10.31891/2079-1372-2021-96-1-13-19.

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The paper presents theoretical studies of changes in the structural viscosity of oil films on the friction surface with fullerene compositions in the field of action of electrostatic forces of the friction surface and the base lubricant. A feature of the use of fullerene additives in lubricants is that fullerenes are readily soluble in a wide class of organic and inorganic solvents. At the same time, poor solubility of fullerenes in technical oils (mineral, semi-synthetic and synthetic). The purpose of this work is to carry out theoretical studies of changes in the structural viscosity of oil

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14

Ratamero, Leandro, and Paulo Vencovsky. "Effect of H-DLC coatings on direct acting cam-tappet friction forces." VETOR - Revista de Ciências Exatas e Engenharias 32, no. 1 (2022): 23–30. http://dx.doi.org/10.14295/vetor.v32i1.13417.

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In internal combustion engines, the valvetrain is responsible for up to 25% of the friction losses, at rotational frequencies below 2000 rpm. Important friction losses in valvetrain come from the contact between the cam and the tappet. Despite to manufacturer specifications for the engine lubricant, the lubricant viscosity can be changed under some conditions, affecting the cam-tappet contact forces. Also, the surface conditions of cam and tappet can affect these friction forces. This work presents a bench mono-valve experimental apparatus and results for frictional force investigations, using

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15

Wierzcholski, Krzysztof, and Andrzej Miszczak. "Estimation of Random Friction Forces on the Microbearing Cooperating Surfaces." Journal of KONES 26, no. 2 (2019): 167–74. http://dx.doi.org/10.2478/kones-2019-0046.

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Abstract Presented paper concerns a new mathematical form of stochastic theory of hydrodynamic friction forces occurring on the real cooperating surfaces in computer micro bearing fan and computer microbearing in hard disc driver HDD. This paper presents particularly a new-review of stochastic analytical considerations realized by the authors for friction forces estimation during hydrodynamic lubrication performed on the ground of the measurements of the gap height between two roughness surfaces. After numerous experimental measurements directly follows that the random unsymmetrical increments

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16

Nishimura, K., and N. Maeno. "Contribution of Viscous Forces to Avalanche Dynamics." Annals of Glaciology 13 (1989): 202–6. http://dx.doi.org/10.3189/s0260305500007898.

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Mini-avalanche systems were constructed both in a low-temperature laboratory and in a snowfield, and the behaviour of the flowing snow was observed in each case. Velocity profiles for the individual snow particles were determined and these implied that a viscous force, which has been neglected in most previous numerical simulations of snow-avalanche motion, needs to be taken into account for many avalanches. Kinematic viscosity coefficients for the fluidized snow were also measured using a modified Stormer-type viscometer. Substituting the dry-friction value and the kinematic viscosity coeffic

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Nishimura, K., and N. Maeno. "Contribution of Viscous Forces to Avalanche Dynamics." Annals of Glaciology 13 (1989): 202–6. http://dx.doi.org/10.1017/s0260305500007898.

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Mini-avalanche systems were constructed both in a low-temperature laboratory and in a snowfield, and the behaviour of the flowing snow was observed in each case. Velocity profiles for the individual snow particles were determined and these implied that a viscous force, which has been neglected in most previous numerical simulations of snow-avalanche motion, needs to be taken into account for many avalanches. Kinematic viscosity coefficients for the fluidized snow were also measured using a modified Stormer-type viscometer. Substituting the dry-friction value and the kinematic viscosity coeffic

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18

Yuan, Qinghui, and Perry Y. Li. "Using Steady Flow Force for Unstable Valve Design: Modeling and Experiments." Journal of Dynamic Systems, Measurement, and Control 127, no. 3 (2004): 451–62. http://dx.doi.org/10.1115/1.1997166.

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In single stage electrohydraulic valves, solenoid actuators are usually used to stroke the main spools directly. They are cheaper and more reliable than multistage valves. Their use, however, is restricted to low bandwidth and low flow rate applications due to the limitation of the solenoid actuators. Our research focuses on alleviating the need for large and expensive solenoids in single stage valves by advantageously using fluid flow forces. For example, in a previous paper, we proposed to improve spool agility by inducing unstable transient flow forces by the use of negative damping lengths

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19

Zhuo, Rui Hua, Shu Wang Yan, and Lei Yu Zhang. "Dynamic Stability Analysis of Viscoelastic Beam under the Follower Forces." Advanced Materials Research 413 (December 2011): 283–88. http://dx.doi.org/10.4028/www.scientific.net/amr.413.283.

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The unification differential equation of buckling and motion of viscoelastic beam subjected to the uniformly distributed follower forces in time domain was established by differential operators including extension viscosity, shearing viscosity and moment of inertia. According to the unification differential equation, dynamic stability of three-parameter model of viscoelastic beams subjected to follower forces with clamped-free supported boundary condition was firstly analyzed by power series. The relations of the follower force versus vibration frequency and decay coefficient were obtained, so

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20

Craig, Julie R. M., and Nicholas Dunne. "Biomechanics of Vertebroplasty: Effect of Cement Viscosity on Mechanical Behaviour." Key Engineering Materials 587 (November 2013): 416–21. http://dx.doi.org/10.4028/www.scientific.net/kem.587.416.

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Vertebroplasty is a minimally invasive surgical procedure, which requires efficacious percutaneous cement delivery via a cannulated needle to restore the strength and stiffness in osteoporotic vertebral bodies. Cement viscosity is understood to influence the injectability, cohesion and cement retention within the vertebral body. Altering the liquid to powder ratio modifies the viscosity of bone cement; however, the cement viscosity-response association between cement fill and augmentation of strength and stiffness is unknown. The aim of this study was to determine the relationship between visc

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21

Finke, Benedikt, Arno Kwade, and Carsten Schilde. "Numerical Simulation of the Rheological Behavior of Nanoparticulate Suspensions." Materials 13, no. 19 (2020): 4288. http://dx.doi.org/10.3390/ma13194288.

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Nanoparticles significantly alter the rheological properties of a polymer or monomeric resin with major effect on the further processing of the materials. In this matter, especially the influence of particle material and disperse properties on the viscosity is not yet understood fully, but can only be modelled to some extent empirically after extensive experimental effort. In this paper, a numerical study on an uncured monomeric epoxy resin, which is filled with boehmite nanoparticles, is presented to elucidate the working principles, which govern the rheological behavior of nanoparticulate su

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Muhammad, Aadil, Rajashekhar Pendyala, and Nejat Rahmanian. "CFD Simulation of Droplet Formation under Various Parameters in Prilling Process." Applied Mechanics and Materials 625 (September 2014): 394–97. http://dx.doi.org/10.4028/www.scientific.net/amm.625.394.

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A computational fluid dynamics (CFD) model is used to investigate the droplet formation and deformation under the influence of different parameters. Droplet breakup phenomenon depends on several factors such as viscosity, velocity, pressure difference, and geometry. The most important parameter for droplet breakup is the Weber number (We) which is the ratio of disrupting aerodynamics forces to the surface tension forces. Volume of fluid (VOF) model is used in present work to simulate the droplet breakup. This work presents the effect of liquid velocity, viscosity, and orifice diameters on drop

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23

Kolev, Iliyan, Dicho Stratiev, Ivelina Shishkova, et al. "Effect of Crude Oil Quality on Properties of Hydrocracked Vacuum Residue and Its Blends with Cutter Stocks to Produce Fuel Oil." Processes 11, no. 6 (2023): 1733. http://dx.doi.org/10.3390/pr11061733.

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The production of heavy fuel oil from hydrocracked vacuum residue requires dilution of the residue with cutter stocks to reduce viscosity. The hydrocracked residue obtained from different vacuum residue blends originating from diverse crude oils may have divergent properties and interact with the variant cutter stocks in a dissimilar way leading to changeable values of density, sediment content, and viscosity of the obtained fuel oil. H-Oil hydrocracked vacuum residues (VTBs) obtained from different crude blends (Urals, Siberian Light (LSCO), and Basrah Heavy) were diluted with the high aromat

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WCISŁO, Grzegorz. "The effect of temperature and shearing rate on dynamic viscosity of RME containing fuels." Combustion Engines 135, no. 4 (2008): 46–53. http://dx.doi.org/10.19206/ce-117231.

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The paper presents the results of a research on determining the temperature and shearing rate effect on dynamic viscosity of type B biofuels. This type of fuels are diesel fuels containing a biocomponent supplement. The “B” value denotes a volumetric share of the biocomponent in a mixture with diesel fuel. Three kinds of biofuels have been tested: B100 (100% RME), B20 (20% RME) and B5 (5%RME). B20 and B5 biofuels were prepared on the basis of commercial VERVA ON diesel oil. The dynamic viscosity of B100 RME biofuels within the temperature range from 30 to –15oC assumes values from c.a. 10 to 9

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Horn, R. G., D. T. Smith, and W. Haller. "Surface forces and viscosity of water measured between silica sheets." Chemical Physics Letters 162, no. 4-5 (1989): 404–8. http://dx.doi.org/10.1016/0009-2614(89)87066-6.

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26

Cheng, J. Y., and M. E. DeMont. "Hydrodynamics of scallop locomotion: unsteady fluid forces on clapping shells." Journal of Fluid Mechanics 317 (June 25, 1996): 73–90. http://dx.doi.org/10.1017/s0022112096000663.

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A potential flow model has been formulated for scallop swimming. Under the smalldisturbance approximation, the problem of the unsteady flow past the wing-like configuration of a scallop is separated into two linear sub-problems: the steady lifting problem and the unsteady symmetric thickness problem. The latter is associated with the expansion and contraction of the boundary surface of the scallop due to the shell opening and closing. A quasi-two-dimensional analytical solution of the thickness problem was obtained to give the time-dependent fluid forces acting on the outer surfaces of the she

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Denslow, Stewart. "Constraints on cardiac hypertrophy imposed by myocardial viscosity." Journal of Applied Physiology 89, no. 3 (2000): 1022–32. http://dx.doi.org/10.1152/jappl.2000.89.3.1022.

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Laplace's law constrains how thin the ventricular wall may be without experiencing excessive stress. The present study investigated constraints, imposed by myocardial viscosity (resistance to internal rearrangement), on how thick the wall may be. The ventricle was modeled as a contracting, spherical shell. The analysis demonstrated that viscosity generates stress and energy dissipation with inverse fourth- and eighth-power dependence, respectively, on distance from the cavity center. This result derives from the combination of squared dependence of viscous forces on shearing velocity gradients

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Chu, H. M., R. T. Lee, S. Y. Hu, and Y. P. Chang. "Rheological Characteristics for Thin Film Elastohydrodynamic Lubrication." Journal of Mechanics 21, no. 2 (2005): 77–84. http://dx.doi.org/10.1017/s172771910000455x.

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ABSTRACTThis paper uses three lubrication models to explore the differential phenomenon in the status of thin film lubrication (TFL). According to the viscous adsorption theory, the modified Reynolds equation for thin film elastohydrodynamic lubrication (TFEHL) is derived. In this theory, the film thickness between lubricated surfaces is simplified as three fixed layers across the film, and the viscosity and density of the lubricant vary with pressure in each layer. Under certain conditions, such as a rough or concentrated contact of a nominally flat surface, films may be of nanometer scale. T

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29

Lachiheb, Mehdi. "On the effect of variable viscosity on the peristaltic transport of a Newtonian fluid in an asymmetric channel." Canadian Journal of Physics 94, no. 3 (2016): 320–27. http://dx.doi.org/10.1139/cjp-2015-0256.

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The effect of variable viscosity on the peristaltic flow of a Newtonian fluid in an asymmetric channel was studied by Hayet and Ali using a viscosity function that takes two different values for any two symmetrical points with respect to the channel axis. This contrasts with the natural phenomena in many situations, such as the motion of chyme within the small intestines and the blood in the arteries where the spatial variation of viscosity is axisymmetric from the axis or walls. Thus, the viscosities at any two symmetrical points should be equal. To achieve this condition, the viscosity funct

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Akinc, Mufit, and Chuan Ping Li. "Rheology of Nanometric Powders." Advances in Science and Technology 45 (October 2006): 347–55. http://dx.doi.org/10.4028/www.scientific.net/ast.45.347.

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Use of environmentally friendly processing additives for nanometric powders has tremendous technological implications. In this study, the rheology of aqueous nanometric alumina powdersuspensions and variation of viscosity with solids content and with fructose concentration were studied by rheometry. The mechanism of dramatic viscosity reduction by fructose addition is studied by differential scanning calorimetry (DSC) and thermogravimetry (TGA). The interparticle forces between the particles were investigated by colloidal probe-atomic force microscopy (CP-AFM). DSC indicates that the significa

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Hiltunen, Salla, Isto Heiskanen, and Kaj Backfolk. "Short-term steam treatment of MFC gel with and without water-soluble cellulose derivative." Nordic Pulp & Paper Research Journal 34, no. 1 (2019): 10–18. http://dx.doi.org/10.1515/npprj-2018-0062.

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Abstract Microfibrillated cellulose (MFC) with and without added CMC was exposed to short-term dynamic thermal treatment using a steam jet cooker. The effects of the elevated temperature (130 °C, ∼3 bar) and shear forces on the rheology, crystallinity index, UV/VIS adsorption and water retention were measured. Jet cooking increased the viscosity and gel strength of the MFC and MFC/CMC mixture but with CMC alone a slight decrease in viscosity was observed. The water retention capacity and crystalline indices of the MFC were not greatly affected by the short-term thermal treatment and shear forc

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Moxness, Vidar Weidemann, Knut Gåseidnes, and Harald Asheim. "Skimmer Capacity for Viscous Oil." SPE Journal 16, no. 01 (2010): 155–61. http://dx.doi.org/10.2118/118701-pa.

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Summary When a skimmer removes oil locally, oil floating further away will flow toward it. The maximum flow rate toward the skimmer defines its natural capacity. Traditional skimmer-capacity modeling considers flow driven by height potential and resisted by inertial forces but neglects viscosity. On the basis of theory and experiments, this paper claims that high oil viscosity may govern the skimmer capacity. It is shown that viscous resistance relates to a dimensionless quantity called the Goose number, representing the ratio of inertial to viscous forces. At high Goose numbers, viscosity may

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Luo, Kehua, Chuanyao Sun, and Tichang Sun. "Effect of Flotation Variables on Slurry Rheological Properties and Flotation Performance of Lead–Zinc Sulfide Ores." Minerals 15, no. 2 (2025): 187. https://doi.org/10.3390/min15020187.

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A slurry’s rheological properties significantly affect flotation performance. Flotation variables—including mineral composition, slurry concentration, and ore particle size—influence these properties by altering the interaction forces between mineral particles and the slurry’s microstructure, thereby impacting flotation outcomes. This study investigated the effects of flotation variables on the rheological properties and flotation performance of lead–zinc sulfide ores in two ternary systems comprising galena or sphalerite + kaolinite and quartz. Cryo-scanning electron microscopy and atomic for

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Thomas, F., T. Bolton, and A. Sastry. "Mechanical forces imposed on echinoid eggs during spawning: mitigation of forces by fibrous networks within egg extracellular layers." Journal of Experimental Biology 204, no. 5 (2001): 815–21. http://dx.doi.org/10.1242/jeb.204.5.815.

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Many echinoderms spawn large numbers of eggs in rapid spawning bouts directly into the water column. During spawning, the eggs pass from the gonad along a narrow oviduct and through a rigid gonopore before reaching the water. As the eggs traverse this pathway, they are exposed to shear stress induced by the development of a velocity gradient within the fluid formed by the eggs. In some species, the diameter of the eggs is larger than the diameter of the gonopore. In these cases, the eggs also experience strain resulting from compression of the egg as it passes through the relatively small gono

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Li, Zhiqi, Duowen Chen, Candong Lin, Jinyuan Liu, and Bo Zhu. "Particle-Laden Fluid on Flow Maps." ACM Transactions on Graphics 43, no. 6 (2024): 1–12. http://dx.doi.org/10.1145/3687916.

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We propose a novel framework for simulating ink as a particle-laden flow using particle flow maps. Our method addresses the limitations of existing flow-map techniques, which struggle with dissipative forces like viscosity and drag, thereby extending the application scope from solving the Euler equations to solving the Navier-Stokes equations with accurate viscosity and laden-particle treatment. Our key contribution lies in a coupling mechanism for two particle systems, coupling physical sediment particles and virtual flow-map particles on a background grid by solving a Poisson system. We impl

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Inalu, Obi Boniface. "Flow of Third Grade Fluid and Vogel’s Model Viscosity in Cylindrical Pipe." International Journal for Research in Applied Science and Engineering Technology 11, no. 8 (2023): 1683–89. http://dx.doi.org/10.22214/ijraset.2023.55379.

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Abstract: The flow of non-Newtonian fluid and Vogel’s model viscosity in cylindrical pipe is treated. The coupled nonlinear equations of motion solved and the effects of sundry parameters of the non-Newtonian fluid and the Vogel model viscosity examined. Results show that the gravitational parameter has a great influence on the flow field. It is observed that as the viscosity index increases, the velocity of the fluid flow reduces. This indicates that the shear strain which reduces the flow velocity, increases the viscosity. Results further show that increase in  increases the temperature of

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Taylor, Aster G., Darryl Z. Seligman, Douglas R. MacAyeal, Olivier R. Hainaut, and Karen J. Meech. "Numerical Simulations of Tidal Deformation and Resulting Light Curves of Small Bodies: Material Constraints of 99942 Apophis and 1I/‘Oumuamua." Planetary Science Journal 4, no. 5 (2023): 79. http://dx.doi.org/10.3847/psj/acccef.

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Abstract In this paper, we present an open-source software (Simulator of Asteroid Malformation Under Stress, SAMUS) that simulates constant-density, constant-viscosity liquid bodies subject to tidal forces for a range of assumed viscosities and sizes. This software solves the Navier–Stokes equations on a finite-element mesh, incorporating the centrifugal, Coriolis, self-gravitational, and tidal forces. The primary functionality is to simulate the deformation of minor bodies under the influence of tidal forces. It may therefore be used to constrain the composition and physical structure of bodi

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Rabbani, Abderrahmane, and Sassi. "Inertial Effects on Dynamics of Immiscible Viscous Fingering in Homogenous Porous Media." Fluids 4, no. 2 (2019): 79. http://dx.doi.org/10.3390/fluids4020079.

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We present a comparative study of the onset and propagation dynamics of the fingering phenomenon in uniform porous media with a radial configuration. With the help of the Finite Element Method (FEM)-based 2D simulations and image processing techniques, we investigate finger morphology, growth rate, interfacial length, finger length and the number of fingers which are affected due to inertial forces and convective acceleration in a two-phase porous media flow. We considered a modified Darcy’s law with inertial force coupled with convective acceleration and investigate their impact on interfacia

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Foresti, D., M. Nabavi, and D. Poulikakos. "On the acoustic levitation stability behaviour of spherical and ellipsoidal particles." Journal of Fluid Mechanics 709 (August 31, 2012): 581–92. http://dx.doi.org/10.1017/jfm.2012.350.

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AbstractWe present here an in-depth analysis of particle levitation stability and the role of the radial and axial forces exerted on fixed spherical and ellipsoidal particles levitated in an axisymmetric acoustic levitator, over a wide range of particle sizes and surrounding medium viscosities. We show that the stability behaviour of a levitated particle in an axisymmetric levitator is unequivocally connected to the radial forces: the loss of levitation stability is always due to the change of the radial force sign from positive to negative. It is found that the axial force exerted on a sphere

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Wang, Jinhe, and Dingyi Pan. "Microstructure and rheology of rim-charged platelike particle suspensions: A numerical study." Journal of Rheology 69, no. 3 (2025): 267–80. https://doi.org/10.1122/8.0000899.

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This article investigates the effect of rim charges on the macroscopic flow behavior of platelike particle suspensions in Couette flow. Fluid-solid coupling is achieved using the lattice spring direct-forcing immersed boundary lattice Boltzmann method. Platelike particles are equipped with rim charges to simulate the inhomogeneous charge distribution commonly observed in clay particles. By examining suspensions with varying numbers of platelike particles, it has been found that rim charges induce particle clustering in shear flow. At low shear rates, inter-particle electrostatic forces drive t

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Dyhr, Katrin, and Norbert Willenbacher. "Formulating Graphite-Filled PU Dispersions with Extended Shelf Life Using the Capillary Suspension Concept." Colloids and Interfaces 9, no. 3 (2025): 26. https://doi.org/10.3390/colloids9030026.

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Stabilizing micron-sized particles in low-viscosity polymer dispersions is challenging when density differences are present. This study demonstrates that graphite particles in aqueous polyurethane dispersions can be efficiently prevented from sedimentation using the capillary suspension concept. Capillary suspensions are solid/liquid/liquid systems and the capillary forces inferred from adding a second immiscible fluid can lead to drastic changes in texture and flow. Here, both spherical and flake-shaped graphite particles were used as fillers, with octanol as the secondary liquid. At low grap

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Arauz, G. L., and L. A. San Andres. "Experimental Pressures and Film Forces in a Squeeze Film Damper." Journal of Tribology 115, no. 1 (1993): 134–40. http://dx.doi.org/10.1115/1.2920966.

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The effect of whirl frequency and lubricant viscosity on the dynamic pressures and force response of an open end and a partially sealed squeeze film dampers (SFD) with a radial clearance of 0.38 mm is determined experimentally. The experiments are carried out in a damper test rig executing circular centered orbits and for whirl frequencies ranging from 33 to 83 Hz. The experimental results show that the sealed SFD configuration produces larger tangential forces than the open end SFD. The tangential (damping) force increases linearly with increasing whirl frequency. For this radial clearance fl

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Schwaiger, T., T. Gastine, and J. Aubert. "Force balance in numerical geodynamo simulations: a systematic study." Geophysical Journal International 219, Supplement_1 (2019): S101—S114. http://dx.doi.org/10.1093/gji/ggz192.

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SUMMARY Dynamo action in the Earth’s outer core is expected to be controlled by a balance between pressure, Coriolis, buoyancy and Lorentz forces, with marginal contributions from inertia and viscous forces. Current numerical simulations of the geodynamo, however, operate at much larger inertia and viscosity because of computational limitations. This casts some doubt on the physical relevance of these models. Our work aims at finding dynamo models in a moderate computational regime which reproduce the leading-order force balance of the Earth. By performing a systematic parameter space survey w

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Ait Abderrahmane, Hamid, Shahid Rabbani, and Mohamed Sassi. "Inertia Effects in the Dynamics of Viscous Fingering of Miscible Fluids in Porous Media: Circular Hele-Shaw Cell Configuration." Energies 14, no. 19 (2021): 6432. http://dx.doi.org/10.3390/en14196432.

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

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Myntiuk, Vitalii, Olga Shypul, Oleh Tryfonov, and Yevgen Tsegelnyk. "Axisymmetric problem of smoothing the surface of a viscous liquid by surface tension forces." Radioelectronic and Computer Systems 2025, no. 1 (2025): 113–25. https://doi.org/10.32620/reks.2025.1.08.

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This study investigates an analytical solution to the problem of the surface levelling of viscous liquids under the influence of surface tension forces, focusing on the smoothing of plastic surfaces subjected to thermal energy treatment. This study aims to extend Orchard’s formula to axisymmetric surface irregularities and develop an analytical model for predicting levelling time, thereby ensuring efficient process control in thermal treatment applications. The tasks included deriving an analytical solution for axisymmetric levelling, validating it against numerical simulations in LS-DYNA, and

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El-Sayed, Hanaa Abdelfattah, Tarek Mohamed Allam, Ahmed Abdallah Lashin, Kamal Mohamed Ahmed, and Hanaa Mohamed Soliman. "INVESTIGATION OF PLASMA VISCOSITY AND MAGNETIC FORCES IN COAXIAL PLASMA DISCHARGE DEVICE." Suranaree Journal of Science and Technology 31, no. 4 (2024): 030216(1–8). http://dx.doi.org/10.55766/sujst-2024-04-e04858.

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This paper investigates the axial plasma current sheath, PCS viscosity force, and its correlation with other magnetic forces acting on it at three different radial positions (2.625, 3.625, and 4.125 cm) within the annular space between the coaxial electrodes system of plasma discharge device (12 kV-56 kA) with positive central electrode. The rate of change of PCS momentum was also investigated at these axial and radial positions. The discharge processes are carried out with an argon gas pressure of 0.8 Torr. Experimental results of azimuthal magnetic induction as a function of axial and radial

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Finke, Benedikt, Clara Sangrós Giménez, Arno Kwade, and Carsten Schilde. "Viscosity Model for Nanoparticulate Suspensions Based on Surface Interactions." Materials 14, no. 11 (2021): 2752. http://dx.doi.org/10.3390/ma14112752.

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In this paper, a widely mechanistic model was developed to depict the rheological behaviour of nanoparticulate suspensions with solids contents up to 20 wt.%, based on the increase in shear stress caused by surface interaction forces among particles. The rheological behaviour is connected to drag forces arising from an altered particle movement with respect to the surrounding fluid. In order to represent this relationship and to model the viscosity, a hybrid modelling approach was followed, in which mechanistic relationships were paired with heuristic expressions. A genetic algorithm was utili

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Abumandour, Ramzy M., Islam M. Eldesoky, Mohamed H. Kamel, Mohamed M. Ahmed, and Sara I. Abdelsalam. "Peristaltic thrusting of a thermal-viscosity nanofluid through a resilient vertical pipe." Zeitschrift für Naturforschung A 75, no. 8 (2020): 727–38. http://dx.doi.org/10.1515/zna-2020-0054.

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AbstractIn the article, the effects of the thermal viscosity and magnetohydrodynamic on the peristalsis of nanofluid are analyzed. The dominant neutralization is deduced through long wavelength approximation. The analytical solution of velocity and temperature is extracted by using steady perturbation. The pressure gradient and friction forces are obtained. Numerical results are calculated and contrasted with the debated theoretical results. These results are calculated for various values of Hartmann number, variable viscosity parameter and amplitude ratio. It is observed that the pressure gra

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Scott, Ryan, Luis Martínez-Tossas, Juliaan Bossuyt, Nicholas Hamilton, and Raúl B. Cal. "Evolution of eddy viscosity in the wake of a wind turbine." Wind Energy Science 8, no. 3 (2023): 449–63. http://dx.doi.org/10.5194/wes-8-449-2023.

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Abstract. The eddy viscosity hypothesis is a popular method in wind turbine wake modeling for estimating turbulent Reynolds stresses. We document the downstream evolution of eddy viscosity in the wake of a wind turbine from experimental and large-eddy-simulation data. Wake eddy viscosity is isolated from its surroundings by subtracting the inflow profile, and the driving forces are identified in each wake region. Eddy viscosity varies in response to changes in turbine geometry and nacelle misalignment with larger turbines generating stronger velocity gradients and shear stresses. We propose a

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Wierzcholski, Krzysztof. "DETERMINATION OF RANDOM FRICTION FORCES ON THE BIOLOGICAL SURFACES OF A HUMAN HIP JOINT WITH A PHOSPHOLIPID BILAYER." Tribologia 284, no. 2 (2019): 131–42. http://dx.doi.org/10.5604/01.3001.0013.4163.

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The paper presented concerns a new mathematical form of the stochastic theory of hydrodynamic friction forces occurring on real human hip joint surfaces with a phospholipids bilayer. This paper particularly presents a new review of stochastic analytical considerations realized by the authors for friction forces estimation during hydrodynamic lubrication of biological surfaces performed on the basis of the gap height measurements in the human hip joint. After numerous experimental measurements, it directly follows that the random unsymmetrical increments and decrements of the gap height of huma

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