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Artykuły w czasopismach na temat „Particle Reynolds Number”

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Data publikacji: 6 września 2023

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1

Chen, Rongqian, Yi Liu, and Deming Nie. "Computer Simulation of Three Particles Sedimentation in a Narrow Channel." Mathematical Problems in Engineering 2017 (2017): 1–11. http://dx.doi.org/10.1155/2017/1259840.

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The settling of three particles in a narrow channel is simulated via the lattice Boltzmann direct-forcing/fictitious domain (LB-DF/FD) method for the Reynolds number ranging from 5 to 200. The effects of the wall and the Reynolds number are studied. It is interesting to find that at certain Reynolds numbers the left (right) particle is settling at 0.175 (0.825) of the channel width irrespective of its initial position or the channel width. Moreover, numerical results have shown that the lateral particles lead at small Reynolds numbers, while the central particle leads at large Reynolds numbers

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2

Mao, Wenbin, and Alexander Alexeev. "Motion of spheroid particles in shear flow with inertia." Journal of Fluid Mechanics 749 (May 14, 2014): 145–66. http://dx.doi.org/10.1017/jfm.2014.224.

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AbstractIn this article, we investigate the motion of a solid spheroid particle in a simple shear flow. Using a lattice Boltzmann method, we examine individual effects of fluid inertia and particle rotary inertia as well as their combination on the dynamics and trajectory of spheroid particles at low and moderate Reynolds numbers. The motion of a single spheroid is shown to be dependent on the particle Reynolds number, particle aspect ratio, particle initial orientation and the Stokes number. Spheroids with random initial orientations are found to drift to stable orbits influenced by fluid ine

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3

DANIEL, W. BRENT, ROBERT E. ECKE, G. SUBRAMANIAN, and DONALD L. KOCH. "Clusters of sedimenting high-Reynolds-number particles." Journal of Fluid Mechanics 625 (April 14, 2009): 371–85. http://dx.doi.org/10.1017/s002211200900620x.

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We report experiments wherein groups of particles were allowed to sediment in an otherwise quiescent fluid contained in a large tank. The Reynolds number of the particles, defined as Re = aU/ν, ranged from 93 to 425; here, a is the radius of the spherical particle, U its settling velocity and ν the kinematic viscosity of the fluid. The characteristic size of a cluster, in a plane transverse to gravity, was measured by a ‘cluster variance’(〈r2t〉); the latter is defined as the mean square of the transverse coordinates of all constituent particles, averaged over a series of runs. The cluster vari

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4

Nie, Deming, Jianzhong Lin, and Mengjiao Zheng. "Direct Numerical Simulation of Multiple Particles Sedimentation at an Intermediate Reynolds Number." Communications in Computational Physics 16, no. 3 (2014): 675–98. http://dx.doi.org/10.4208/cicp.270513.130314a.

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AbstractIn this work the previously developed Lattice Boltzmann-Direct Forcing/ Fictitious Domain (LB-DF/FD) method is adopted to simulate the sedimentation of eight circular particles under gravity at an intermediate Reynolds number of about 248. The particle clustering and the resulting Drafting-Kissing-Tumbling (DKT) motion which takes place for the first time are explored. The effects of initial particle-particle gap on the DKT motion are found significant. In addition, the trajectories of particles are presented under different initial particle-particle gaps, which display totally three k

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5

Mei, Renwei, and Ronald J. Adrian. "Effect of Reynolds Number on Isotropic Turbulent Dispersion." Journal of Fluids Engineering 117, no. 3 (1995): 402–9. http://dx.doi.org/10.1115/1.2817276.

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The influence of the spatio-temporal structure of isotropic turbulence on the dispersion of fluid and particles with inertia is investigated. The spatial structure is represented by an extended von Ka´rma´n energy spectrum model which includes an inertial sub-range and allows evaluation of the effect of the turbulence Reynolds number, Reλ. Dispersion of fluid is analyzed using four different models for the Eulerian temporal auto-correlation function D(τ). The fluid diffusivity, normalized by the integral length scale L11 and the root-mean-square turbulent velocity u0, depends on Reλ. The param

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6

Tu, Chengxu, and Jian Zhang. "Nanoparticle-laden gas flow around a circular cylinder at high Reynolds number." International Journal of Numerical Methods for Heat & Fluid Flow 24, no. 8 (2014): 1782–94. http://dx.doi.org/10.1108/hff-03-2013-0101.

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Purpose – Experiments to investigate the characteristic distribution of nanoparticle-laden gas flow around a circular cylinder were performed with a fast mobility particle spectrometer. The paper aims to discuss these issues. Design/methodology/approach – The fast mobility particle sizer spectrometer is used to measure quasi-instantaneous particle number density. The acquired particle number density, total concentration, and geometric mean diameter at free stream and in the wake were used to discuss the particle characteristic distribution. The time-averaged velocity field detected by particle

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7

Almerol, Jenny Lynn Ongue, and Marissa Pastor Liponhay. "Clustering of fast gyrotactic particles in low-Reynolds-number flow." PLOS ONE 17, no. 4 (2022): e0266611. http://dx.doi.org/10.1371/journal.pone.0266611.

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Systems of particles in turbulent flows exhibit clustering where particles form patches in certain regions of space. Previous studies have shown that motile particles accumulate inside the vortices and in downwelling regions, while light and heavy non-motile particles accumulate inside and outside the vortices, respectively. While strong clustering is generated in regions of high vorticity, clustering of motile particles is still observed in fluid flows where vortices are short-lived. In this study, we investigate the clustering of fast swimming particles in a low-Reynolds-number turbulent flo

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8

Heymsfield, Andrew, and Robert Wright. "Graupel and Hail Terminal Velocities: Does a “Supercritical” Reynolds Number Apply?" Journal of the Atmospheric Sciences 71, no. 9 (2014): 3392–403. http://dx.doi.org/10.1175/jas-d-14-0034.1.

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Abstract This study characterizes the terminal velocities of heavily rimed ice crystals and aggregates, graupel, and hail using a combination of recent drag coefficient and particle bulk density observations. Based on a nondimensional Reynolds number (Re)–Best number (X) approach that applies to atmospheric temperatures and pressures where these particles develop and fall, the authors develop a relationship that spans a wide range of particle sizes. The Re–X relationship can be used to derive the terminal velocities of rimed particles for many applications. Earlier observations suggest that a

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9

Wu, Zhenqun, Hui Jin, and Leijin Guo. "Investigation on the drag coefficient of supercritical water flow past sphere-particle at low reynolds numbers." Thermal Science 21, suppl. 1 (2017): 217–23. http://dx.doi.org/10.2298/tsci17s1217w.

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Supercritical water fluidized bed is novel reactor for the efficient gasification of coal to produce hydrogen. The Euler-Euler and Euler-Lagrange methods can be used to simulate the flow behaviors supercritical water fluidized bed. The accuracy of the simulated results with the two methods has a great dependence on the drag coefficient model, and there is little work focused on the study on particle?s drag force in supercritical water. In this work, the drag coefficients of supercritical water flow past a single particle and particle cluster. The simulated results show that the flow field and

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10

Espinosa-Gayosso, Alexis, Marco Ghisalberti, Gregory N. Ivey, and Nicole L. Jones. "Particle capture and low-Reynolds-number flow around a circular cylinder." Journal of Fluid Mechanics 710 (September 7, 2012): 362–78. http://dx.doi.org/10.1017/jfm.2012.367.

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AbstractParticle capture, whereby suspended particles contact and adhere to a solid surface (a ‘collector’), is an important mechanism in a range of environmental processes. In aquatic systems, typically characterized by low collector Reynolds numbers ($\mathit{Re}$), the rate of particle capture determines the efficiencies of a range of processes such as seagrass pollination, suspension feeding by corals and larval settlement. In this paper, we use direct numerical simulation (DNS) of a two-dimensional laminar flow to accurately quantify the rate of capture of low-inertia particles by a cylin

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11

LEU, TZONG-SHYNG, and CHING-YI PAI. "PARTICLE-FREE EXTRACTION BY USING MICROCHANNEL STRUCTURES." International Journal of Modern Physics: Conference Series 19 (January 2012): 237–41. http://dx.doi.org/10.1142/s201019451200880x.

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Modern separation methods of particles are usually prepared by large equipments. In this study, microfluidic chips with backward-facing-step (BFS) microchannel structures and centrifugal force are used to extract particle-free fluid from physical samples at the branch. Numerical simulation and experimental studies were performed to investigate the effects of inlet Reynolds number ( Re 0), as well as the particle-free fluid outlet Reynolds number ( Re 1), on the minimum radius of particles (R) that can be excluded from the particle-free fluid outlet channel. The fraction of the volumetric flow

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12

PATANKAR, N. A., T. KO, H. G. CHOI, and D. D. JOSEPH. "A correlation for the lift-off of many particles in plane Poiseuille flows of Newtonian fluids." Journal of Fluid Mechanics 445 (October 16, 2001): 55–76. http://dx.doi.org/10.1017/s0022112001005274.

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Choi & Joseph (2001) reported a two-dimensional numerical investigation of the lift-off of 300 circular particles in plane Poiseuille flows of Newtonian fluids. We perform similar simulations. Particles heavier than the fluid are initially placed in a closely packed ordered configuration at the bottom of a periodic channel. The fluid–particle mixture is driven by an external pressure gradient. The particles are suspended or fluidized by lift forces that balance the buoyant weight perpendicular to the flow. Pressure waves corresponding to the waves at the fluid–mixture interface are observe

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13

Rostami, M., A. Ardeshir, G. Ahmadi, and P. J. Thomas. "On the effect of gravitational and hydrodynamic forces on particle motion in a quiescent fluid at high particle Reynolds numbers." Canadian Journal of Physics 86, no. 6 (2008): 791–99. http://dx.doi.org/10.1139/p07-198.

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Trajectories of 5 and 10 mm metallic and plastic particles in a quiescent liquid during their sedimentation toward a plate were studied using experimental and numerical means, and the influence of gravity, drag, added mass, and history forces were evaluated. Variations of particle diameter and density allowed measurements at Reynolds numbers, based on the impact velocity, in the range of 1 000 to 13 000. A computer model was developed and the Lagrangian equation of particle motion was solved. The results showed that the combination of gravity, drag, and added mass forces are important for the

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14

VOTH, GREG A., A. LA PORTA, ALICE M. CRAWFORD, JIM ALEXANDER, and EBERHARD BODENSCHATZ. "Measurement of particle accelerations in fully developed turbulence." Journal of Fluid Mechanics 469 (October 15, 2002): 121–60. http://dx.doi.org/10.1017/s0022112002001842.

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We use silicon strip detectors (originally developed for the CLEO III high-energy particle physics experiment) to measure fluid particle trajectories in turbulence with temporal resolution of up to 70000 frames per second. This high frame rate allows the Kolmogorov time scale of a turbulent water flow to be fully resolved for 140 [ges ] Rλ [ges ] 970. Particle trajectories exhibiting accelerations up to 16000 m s −2 (40 times the r.m.s. value) are routinely observed. The probability density function of the acceleration is found to have Reynolds-number-dependent stretched exponential tails. The

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15

HEWITT, G. F., and J. S. MARSHALL. "Particle focusing in a suspension flow through a corrugated tube." Journal of Fluid Mechanics 660 (July 21, 2010): 258–81. http://dx.doi.org/10.1017/s0022112010002697.

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A computational study is performed of the transport of a particulate suspension through a corrugated tube using a discrete-element method (DEM). The tube is axisymmetric with a radius that varies sinusoidally along the tube length, which, in the presence of a mean suspension flow, leads to periodic inward and outward acceleration of the advected particles. The oscillations in radial acceleration and straining rate lead to a net radial drift, with mean acceleration measuring about an order of magnitude smaller than the instantaneous radial acceleration, which over time focuses small particles w

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16

Lin, Wenqian, Ruifang Shi, and Jianzhong Lin. "Distribution and Deposition of Cylindrical Nanoparticles in a Turbulent Pipe Flow." Applied Sciences 11, no. 3 (2021): 962. http://dx.doi.org/10.3390/app11030962.

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Distribution and deposition of cylindrical nanoparticles in a turbulent pipe flow are investigated numerically. The equations of turbulent flow including the effect of particles are solved together with the mean equations of the particle number density and the probability density function for particle orientation including the combined effect of Brownian and turbulent diffusion. The results show that the distribution of the particle concentration on the cross-section becomes non-uniform along the flow direction, and the non-uniformity is reduced with the increases of the particle aspect ratio

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17

McLaughlin, John B. "Inertial migration of a small sphere in linear shear flows." Journal of Fluid Mechanics 224 (March 1991): 261–74. http://dx.doi.org/10.1017/s0022112091001751.

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The motion of a small, rigid sphere in a linear shear flow is considered. Saffman's analysis is extended to other asymptotic cases in which the particle Reynolds number based on its slip velocity is comparable with or larger than the square root of the particle Reynolds number based on the velocity gradient. In all cases, both particle Reynolds numbers are assumed to be small compared to unity. It is shown that, as the Reynolds number based on particle slip velocity becomes larger than the square root of the Reynolds number based on particle shear rate, the magnitude of the inertial migration

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18

Rubinstein, Gregory J., J. J. Derksen, and Sankaran Sundaresan. "Lattice Boltzmann simulations of low-Reynolds-number flow past fluidized spheres: effect of Stokes number on drag force." Journal of Fluid Mechanics 788 (January 8, 2016): 576–601. http://dx.doi.org/10.1017/jfm.2015.679.

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In a fluidized bed, the drag force acts to oppose the downward force of gravity on a particle, and thus provides the main mechanism for fluidization. Drag models that are employed in large-scale simulations of fluidized beds are typically based on either fixed-particle beds or the sedimentation of particles in liquids. In low-Reynolds-number ($Re$) systems, these two types of fluidized beds represent the limits of high Stokes number ($St$) and low $St$, respectively. In this work, the fluid–particle drag behaviour of these two regimes is bridged by investigating the effect of $St$ on the drag

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19

Feng, J., H. H. Hu, and D. D. Joseph. "Direct simulation of initial value problems for the motion of solid bodies in a Newtonian fluid Part 1. Sedimentation." Journal of Fluid Mechanics 261 (February 25, 1994): 95–134. http://dx.doi.org/10.1017/s0022112094000285.

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This paper reports the result of direct simulations of fluid–particle motions in two dimensions. We solve the initial value problem for the sedimentation of circular and elliptical particles in a vertical channel. The fluid motion is computed from the Navier–Stokes equations for moderate Reynolds numbers in the hundreds. The particles are moved according to the equations of motion of a rigid body under the action of gravity and hydrodynamic forces arising from the motion of the fluid. The solutions are as exact as our finite-element calculations will allow. As the Reynolds number is increased

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20

Fornari, Walter, Mehdi Niazi Ardekani, and Luca Brandt. "Clustering and increased settling speed of oblate particles at finite Reynolds number." Journal of Fluid Mechanics 848 (June 11, 2018): 696–721. http://dx.doi.org/10.1017/jfm.2018.370.

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We study the settling of rigid oblates in a quiescent fluid using interface-resolved direct numerical simulations. In particular, an immersed boundary method is used to account for the dispersed solid phase together with lubrication correction and collision models to account for short-range particle–particle interactions. We consider semi-dilute suspensions of oblate particles with aspect ratio $AR=1/3$ and solid volume fractions $\unicode[STIX]{x1D719}=0.5{-}10\,\%$. The solid-to-fluid density ratio $R=1.02$ and the Galileo number (i.e. the ratio between buoyancy and viscous forces) based on

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21

Yin, Zhao-Qin, and Ming Lou. "Experimental study on nanoparticle deposition in straight pipe flow." Thermal Science 16, no. 5 (2012): 1410–13. http://dx.doi.org/10.2298/tsci1205410y.

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Loss of the number of nanoparticles within pipe may lead to significant change of particle number distribution, total mass concentration and particles mean size. The experiments of multiple dispersion aerosol particles ranging from 5.6 nm to 560 nm in straight pipe are carried out using a fast mobility particle sizer. The particle size number distribution, total number concentrations, geometric mean size and volume are acquired under different pipe lengths and Reynolds numbers. The results show lengthening the pipe and strengthening the turbulence can promote the particle deposition process. T

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22

Kurose, Ryoichi, Hisao Makino, and Satoru Komori. "Particle Trajectory in Turbulent Boundary Layer at High Particle Reynolds Number." Journal of Fluids Engineering 123, no. 4 (2001): 956–58. http://dx.doi.org/10.1115/1.1400750.

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23

H. Sulaymon, Abbas, and Sawsan A. M. Mohammed. "Drag Forces under Longitudinal Interaction of Two Particle." Iraqi Journal of Chemical and Petroleum Engineering 8, no. 2 (2007): 1–4. http://dx.doi.org/10.31699/ijcpe.2007.2.1.

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Direct measurements of drag force on two interacting particles arranged in the longitudinal direction for particle Reynolds numbers varying from J O to 103 are conducted using a micro-force measurement system. The effect of the interparticle distance and Reynolds number on the drag forces is examined. An empirical equation is obtained to describe the effect of the interparticle distance (l/d) on the dimensionless drag.

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24

Ireland, Peter J., Andrew D. Bragg, and Lance R. Collins. "The effect of Reynolds number on inertial particle dynamics in isotropic turbulence. Part 1. Simulations without gravitational effects." Journal of Fluid Mechanics 796 (May 11, 2016): 617–58. http://dx.doi.org/10.1017/jfm.2016.238.

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In this study, we analyse the statistics of both individual inertial particles and inertial particle pairs in direct numerical simulations of homogeneous isotropic turbulence in the absence of gravity. The effect of the Taylor microscale Reynolds number, $R_{{\it\lambda}}$, on the particle statistics is examined over the largest range to date (from $R_{{\it\lambda}}=88$ to 597), at small, intermediate and large Kolmogorov-scale Stokes numbers $St$. We first explore the effect of preferential sampling on the single-particle statistics and find that low-$St$ inertial particles are ejected from b

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25

XIE, M. L., J. Z. LIN, and H. C. ZHOU. "TEMPORAL STABILITY OF A PARTICLE-LADEN BLASIUS BOUNDARY LAYER." Modern Physics Letters B 23, no. 02 (2009): 203–16. http://dx.doi.org/10.1142/s0217984909017844.

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The temporal instability of incompressible particle-laden Blasius boundary layer is investigated numerically using perturbation method and finite difference. The stability characteristics are calculated for varying Stokes' numbers and particle concentrations. The results, some of which agree with the calculations of earlier authors, show that the addition of fine particles tends to destabilize the flow while addition of the coarse particles has a stabilizing action. There is critical value for the effect of Stokes' number, and the value is about 1. The stabilizing effect of particles depends m

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26

Nie, De Ming, and Meng Jiao Zheng. "Computer Simulation of a Drop-Shaped Particle Settling in a Newtonian Fluid." Applied Mechanics and Materials 444-445 (October 2013): 369–73. http://dx.doi.org/10.4028/www.scientific.net/amm.444-445.369.

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This work focuses on the effects of the particle shape factor and blockage ratio on the friction coefficient and drag coefficient of the drop-shaped particle for Reynolds number ranging from 10-2 to 102 when the particle is settling under gravity. Comparison with the results of a circular particle has also been presented. It has been shown that the particle friction coefficient keeps constant when Reynolds number is below 1, and increases as Reynolds number increasing when Reynolds number is greater than 1. Furthermore, results have also shown that both the friction coefficient and drag coeffi

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27

Zhao, Lihao, and Helge I. Andersson. "Statistics of Particle Suspensions in Turbulent Channel Flow." Communications in Computational Physics 11, no. 4 (2012): 1311–22. http://dx.doi.org/10.4208/cicp.080510.150511s.

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AbstractParticle dynamics in a turbulent channel flow is considered. The effects of particle concentration and Reynolds number on the particle velocity statistics are investigated. Four different particle response times, τ+=1, 5, 30 and 100, are examined for three different Reynolds numbers, Re*=200, 360 and 790 (based on channel height and friction velocity). The particle concentration evolves with time and statistics obtained during three different sampling periods might be distinctly different. The mean and fluctuating particle velocities are substantially affected both by the particle resp

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28

Nie, Deming, Limin Qiu, and Xiaobin Zhang. "Direct numerical simulation of multiple interacting particles at intermediate Reynolds numbers." International Journal of Numerical Methods for Heat & Fluid Flow 25, no. 2 (2015): 202–13. http://dx.doi.org/10.1108/hff-04-2013-0138.

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Purpose – The purpose of this paper is to study the flow patterns and particle-particle collisions during the sedimentation of multiple circular particles under gravity at intermediate Reynolds numbers through direct numerical simulations (DNS). Design/methodology/approach – The previously developed lattice Boltzmann-direct forcing/fictitious domain (LB-DF/FD) method is adopted in this work to conduct DNS. Findings – It is found that the number of particle-particle collisions display a linear growth at long times after an initial evolution, resulting in a constant collision rate, which also de

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29

Zandi Pour, Hamid Reza, and Michele Iovieno. "Heat Transfer in a Non-Isothermal Collisionless Turbulent Particle-Laden Flow." Fluids 7, no. 11 (2022): 345. http://dx.doi.org/10.3390/fluids7110345.

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To better understand the role of particle inertia on the heat transfer in the presence of a thermal inhomogeneity, Eulerian–Lagrangian direct numerical simulations (DNSs) have been carried out by using the point–particle model. By considering particles transported by a homogeneous and isotropic, statistically steady turbulent velocity field with a Taylor microscale Reynolds number from 37 to 124, we have investigated the role of particle inertia and thermal inertia in one- and two-way coupling collisionless regimes on the heat transfer between two regions at uniform temperature. A wide range o

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30

Linares-Guerrero, Esperanza, Melany L. Hunt, and Roberto Zenit. "Effects of inertia and turbulence on rheological measurements of neutrally buoyant suspensions." Journal of Fluid Mechanics 811 (December 13, 2016): 525–43. http://dx.doi.org/10.1017/jfm.2016.763.

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For low-Reynolds-number shear flows of neutrally buoyant suspensions, the shear stress is often modelled using an effective viscosity that depends only on the solid fraction. As the Reynolds number ($Re$) is increased and inertia becomes important, the effective viscosity also depends on the Reynolds number itself. The current experiments measure the torque for flows of neutrally buoyant particles in a coaxial-cylinder rheometer for solid fractions, $\unicode[STIX]{x1D719}$, from 10 % to 50 % and Reynolds numbers based on particle diameter from 2 to 1000. For experiments for Reynolds of $O(10)

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Espinosa-Gayosso, Alexis, Marco Ghisalberti, Gregory N. Ivey, and Nicole L. Jones. "Particle capture by a circular cylinder in the vortex-shedding regime." Journal of Fluid Mechanics 733 (September 19, 2013): 171–88. http://dx.doi.org/10.1017/jfm.2013.407.

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AbstractParticle capture, whereby suspended particles contact and adhere to a solid surface (a ‘collector’), is an important mechanism for a range of environmental processes including suspension feeding by corals and ‘filtering’ by aquatic vegetation. In this paper, we use two- and three-dimensional direct numerical simulations to quantify the capture efficiency ($\eta $) of low-inertia particles by a circular cylindrical collector at intermediate Reynolds numbers in the vortex-shedding regime (i.e. for $47\lt \mathit{Re}\leq 1000$, where $\mathit{Re}$ is the collector Reynolds number). We dem

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32

QI, DEWEI. "Lattice-Boltzmann simulations of particles in non-zero-Reynolds-number flows." Journal of Fluid Mechanics 385 (April 25, 1999): 41–62. http://dx.doi.org/10.1017/s0022112099004401.

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A lattice-Boltzmann method has been developed to simulate suspensions of both spherical and non-spherical particles in finite-Reynolds-number flows. The results for sedimentation of a single elliptical particle are shown to be in excellent agreement with the results of Huang, Hu & Joseph (1998) who used a finite-element method. Sedimentation of two-dimensional circular and rectangular particles in a two-dimensional channel and three-dimensional spherical particles in a tube with square cross-section is simulated. Computational results are consistent with experimentally observed phenomena,

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33

Zhang, Z., C. Kleinstreuer, and C. S. Kim. "Flow Structure and Particle Transport in a Triple Bifurcation Airway Model1." Journal of Fluids Engineering 123, no. 2 (2000): 320–30. http://dx.doi.org/10.1115/1.1359525.

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Considering steady laminar incompressible flow in a triple bifurcation, which represents generations three to six of the human respiratory system, air flow fields and micron-particle transport have been simulated for several combinations of relatively high and low inlet Reynolds and Stokes numbers. While the upstream bifurcations are hardly affected by the third bifurcation, complex air and particle flow fields occur in the daughter tubes leading to the third dividers. Variations in Reynolds number, 500⩽Re⩽2000, and Stokes number, 0.04⩽St⩽0.12, cause locally changing vortical air flows as well

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Niazi Ardekani, M., O. Abouali, F. Picano, and L. Brandt. "Heat transfer in laminar Couette flow laden with rigid spherical particles." Journal of Fluid Mechanics 834 (November 17, 2017): 308–34. http://dx.doi.org/10.1017/jfm.2017.709.

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We study heat transfer in plane Couette flow laden with rigid spherical particles by means of direct numerical simulations. In the simulations we use a direct-forcing immersed boundary method to account for the dispersed phase together with a volume-of-fluid approach to solve the temperature field inside and outside the particles. We focus on the variation of the heat transfer with the particle Reynolds number, total volume fraction (number of particles) and the ratio between the particle and fluid thermal diffusivity, quantified in terms of an effective suspension diffusivity. We show that, w

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Duque-Daza, Carlos Alberto, Jesus Ramirez-Pastran, and Santiago Lain. "Influence of Particle Mass Fraction over the Turbulent Behaviour of an Incompressible Particle-Laden Flow." Fluids 6, no. 11 (2021): 374. http://dx.doi.org/10.3390/fluids6110374.

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The presence of spherical solid particles immersed in an incompressible turbulent flow was numerically investigated from the perspective of the particle mass fraction (PMF or ϕm), a measure of the particle-to-fluid mass ratio. Although a number of different changes have been reported to be obtained by the presence of solid particles in incompressible turbulent flows, the present study reports the findings of varying ϕm in the the turbulent behaviour of the flow, including aspects such as: turbulent statistics, skin-friction coefficient, and the general dynamics of a particle-laden flow. For th

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HAUGEN, NILS ERLAND L., and STEINAR KRAGSET. "Particle impaction on a cylinder in a crossflow as function of Stokes and Reynolds numbers." Journal of Fluid Mechanics 661 (July 27, 2010): 239–61. http://dx.doi.org/10.1017/s0022112010002946.

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A high-order direct numerical simulation code (The Pencil Code) has been used together with the immersed boundary method on a Cartesian grid to simulate particle impaction on a cylinder in a crossflow. The direct numerical scheme concerns only the fluid flow, into which the particles are subsequently coupled through a one-way drag-coefficient law. The immersed boundary method is extended to work with high-order discretization, and the particle impaction efficiency has been measured for Stokes numbers ranging from 0.001 to 40 for a range of different Reynolds numbers. Three modes of impaction o

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Gao, Yanfeng, Pascale Magaud, Lucien Baldas, and Yanping Wang. "Inertial Migration of Neutrally Buoyant Spherical Particles in Square Channels at Moderate and High Reynolds Numbers." Micromachines 12, no. 2 (2021): 198. http://dx.doi.org/10.3390/mi12020198.

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The inertial migration of particles in microchannel flows has been deeply investigated in the last two decades. In spite of numerous reports on the inertial focusing patterns in a square channel, the particle inertial focusing and longitudinal ordering processes remain unclear at high Reynolds numbers (>200) in square microchannels smaller than 100 µm in width. Thus, in this work, in situ visualization of particles flowing in square micro-channels at Reynolds numbers Re ranging from 5 to 280 has been conducted and their migration behaviors have been analyzed. The obtained results confirm th

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Wang, Ruijin. "Hydrodynamic Trapping of Particles in an Expansion-Contraction Microfluidic Device." Abstract and Applied Analysis 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/496243.

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Manipulation and sorting of particles utilizing microfluidic phenomena have been a hot spot in recent years. Here, we present numerical investigations on particle trapping techniques by using intrinsic hydrodynamic effects in an expansion-contraction microfluidic device. One emphasis is on the underlying fluid dynamical mechanisms causing cross-streamlines migration of the particles in shear and vortical flows. The results show us that the expansion-contraction geometric structure is beneficial to particle trapping according to its size. Particle Reynolds number and aspect ratio of the channel

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Chtab, Anna, and Mikhael Gorokhovski. "Large-Eddy Simulation With Simplified Collisional Microdynamics in a High Reynolds Number Particle-Laden Channel Flow." Journal of Fluids Engineering 129, no. 5 (2006): 613–20. http://dx.doi.org/10.1115/1.2717619.

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Computing high Reynolds number channel flows laden by heavy solid particles requires excessive CPU resources to calculate interparticle collisions. Since the frequency of these collisions is high, the kinematic details of each elementary collision may not be essential when calculating particle statistics. In this paper, the dynamics of a particle with a phase trajectory that is discontinuous (due to collisions) is simulated using a hypothetical “noncolliding” particle moving along a trajectory smoothed over interparticle collisions. The statistical temperature of this particle is assumed to be

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Wang, Zekun, Khuram Walayat, and Moubin Liu. "A velocity corrected unresolved CFD-DEM coupled method to reproduce wake effects at moderate Reynolds number." Engineering Computations 36, no. 8 (2019): 2612–33. http://dx.doi.org/10.1108/ec-10-2018-0454.

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Purpose The purpose of this paper is to develop a corrected unresolved CFD-DEM method that can reproduce the wake effects in modeling particulate flows at moderate Reynolds number. Design/methodology/approach First, the velocity field in the wake behind a settling particle is numerically investigated by a resolved method, in which the finite volume method (FVM) is applied to model the fluid flow, discrete element method (DEM) is applied to simulate the motion of particles and immersed boundary method (IBM) is used to tackle fluid solid interaction. Second, an analytical scaling law is given, w

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CHOI, HYOUNG G., and DANIEL D. JOSEPH. "Fluidization by lift of 300 circular particles in plane Poiseuille flow by direct numerical simulation." Journal of Fluid Mechanics 438 (July 5, 2001): 101–28. http://dx.doi.org/10.1017/s0022112001004177.

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We study the transport of a slurry of heavier-than-liquid circular particles in a plane pressure-driven flow in a direct simulation. The flow is calculated in a periodic domain containing 300 circular particles. The study leads to the concept of fluidization by lift in which all the particles are suspended by lift forces against gravity perpendicular to the flow. The study is framed as an initial-value problem in which a closely packed cubic array of particles resting on the bottom of the channel is lifted into suspension. All the details of the flow are resolved numerically without model assu

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Collins, Lance R., and Arun Keswani. "Reynolds number scaling of particle clustering in turbulent aerosols." New Journal of Physics 6 (September 18, 2004): 119. http://dx.doi.org/10.1088/1367-2630/6/1/119.

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Meister, Michael, Gregor Burger, and Wolfgang Rauch. "On the Reynolds number sensitivity of smoothed particle hydrodynamics." Journal of Hydraulic Research 52, no. 6 (2014): 824–35. http://dx.doi.org/10.1080/00221686.2014.932855.

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Blake, T. R. "Low reynolds number combustion of a spherical carbon particle." Combustion and Flame 129, no. 1-2 (2002): 87–111. http://dx.doi.org/10.1016/s0010-2180(01)00360-1.

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Park, Ki Sun, and Stephen D. Heister. "Modeling particle collision processes in high Reynolds number flow." Journal of Aerosol Science 66 (December 2013): 123–38. http://dx.doi.org/10.1016/j.jaerosci.2013.08.010.

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Yu, Zhaosheng, Peng Wang, Jianzhong Lin, and Howard H. Hu. "Equilibrium positions of the elasto-inertial particle migration in rectangular channel flow of Oldroyd-B viscoelastic fluids." Journal of Fluid Mechanics 868 (April 11, 2019): 316–40. http://dx.doi.org/10.1017/jfm.2019.188.

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In this paper, the lateral migration of a neutrally buoyant spherical particle in the pressure-driven rectangular channel flow of an Oldroyd-B fluid is numerically investigated with a fictitious domain method. The aspect ratio of the channel cross-section considered is 1 and 2, respectively. The particle lateral motion trajectories are shown for the bulk Reynolds number ranging from 1 to 100, the ratio of the solvent viscosity to the total viscosity being 0.5, and a Weissenberg number up to 1.5. Our results indicate that the lateral equilibrium positions located on the cross-section midline, d

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Nirschl, H., H. A. Dwyer, and V. Denk. "Three-dimensional calculations of the simple shear flow around a single particle between two moving walls." Journal of Fluid Mechanics 283 (January 25, 1995): 273–85. http://dx.doi.org/10.1017/s002211209500231x.

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Three-dimensional solutions have been obtained for the steady simple shear flow over a spherical particle in the intermediate Reynolds number range 0.1 [les ] Re [les ] 100. The shear flow was generated by two walls which move at the same speed but in opposite directions, and the particle was located in the middle of the gap between the walls. The particle-wall interaction is treated by introducing a fully three-dimensional Chimera or overset grid scheme. The Chimera grid scheme allows each component of a flow to be accurately and efficiently treated. For low Reynolds numbers and without any w

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PATANKAR, N. A., P. Y. HUANG, T. KO, and D. D. JOSEPH. "Lift-off of a single particle in Newtonian and viscoelastic fluids by direct numerical simulation." Journal of Fluid Mechanics 438 (July 5, 2001): 67–100. http://dx.doi.org/10.1017/s0022112001004104.

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In this paper we study the lift-off to equilibrium of a single circular particle in Newtonian and viscoelastic fluids by direct numerical simulation. A particle heavier than the fluid is driven forward on the bottom of a channel by a plane Poiseuille flow. After a certain critical Reynolds number, the particle rises from the wall to an equilibrium height at which the buoyant weight just balances the upward thrust from the hydrodynamic force. The aim of the calculation is the determination of the critical lift-off condition and the evolution of the height, velocity and angular velocity of the p

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Li, Xiaohui, Guodong Liu, Junnan Zhao, Xiaolong Yin, and Huilin Lu. "IBM-LBM-DEM Study of Two-Particle Sedimentation: Drafting-Kissing-Tumbling and Effects of Particle Reynolds Number and Initial Positions of Particles." Energies 15, no. 9 (2022): 3297. http://dx.doi.org/10.3390/en15093297.

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Particle sedimentation is a fundamental process encountered in various industrial applications. In this study, we used immersed boundary lattice Boltzmann method and discrete element method (IBM-LBM-DEM) to investigate two-particle sedimentation. A lattice Boltzmann method was used to simulate fluid flow, a discrete element method was used to simulate particle dynamics, and an immersed boundary method was used to handle particle–fluid interactions. Via the IBM-LBM-DEM, the particles collision process in fluid or between rigid walls can be calculated to capture the information of particles and

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Shao, Xueming, Tenghu Wu, and Zhaosheng Yu. "Fully resolved numerical simulation of particle-laden turbulent flow in a horizontal channel at a low Reynolds number." Journal of Fluid Mechanics 693 (January 17, 2012): 319–44. http://dx.doi.org/10.1017/jfm.2011.533.

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AbstractA fictitious domain method is used to perform fully resolved numerical simulations of particle-laden turbulent flow in a horizontal channel. The effects of large particles of diameter 0.05 and 0.1 times the channel height on the turbulence statistics and structures are investigated for different settling coefficients and volume fractions (0.79 %–7.08 %) for the channel Reynolds number being 5000. The results indicate the following. (a) When the particle sedimentation effect is negligible (i.e. neutrally buoyant), the presence of particles decreases the maximum r.m.s. of streamwise velo

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