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Journal articles on the topic 'Particle-wall collision model'

Author: Grafiati

Published: 4 June 2021

Last updated: 19 February 2022

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1

Lin, J. H., and K. C. Chang. "Particle Dispersion Simulation in Turbulent Flow Due to Particle-Particle and Particle-Wall Collisions." Journal of Mechanics 32, no. 2 (August 19, 2015): 237–44. http://dx.doi.org/10.1017/jmech.2015.63.

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AbstractSimulation of the 3-D, fully developed turbulent channel flows laden with various mass loading ratios of particles is made using an Eulerian-Lagrangian approach in which the carrier-fluid flow field is solved with a low-Reynolds-number k-ε turbulence model while the deterministic Lagrangian method together with binary-collision hard-sphere model is applied for the solution of particle motion. Effects of inter-particle collisions and particle-wall collisions under different extents of wall roughness on particle dispersion are addressed in the study. A cost-effective searching algorithm

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2

ARDEKANI, A. M., and R. H. RANGEL. "Numerical investigation of particle–particle and particle–wall collisions in a viscous fluid." Journal of Fluid Mechanics 596 (January 17, 2008): 437–66. http://dx.doi.org/10.1017/s0022112007009688.

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The dynamics of particle–particle collisions and the bouncing motion of a particle colliding with a wall in a viscous fluid is numerically investigated. The dependence of the effective coefficient of restitution on the Stokes number and surface roughness is analysed. A distributed Lagrange multiplier-based computational method in a solid–fluid system is developed and an efficient method for predicting the collision between particles is presented. A comparison between this method and previous collision strategies shows that the present approach has some significant advantages over them. Compari

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3

Derevich, I. V. "Probabilistic model of a particle-rough wall collision." Journal of Applied Mechanics and Technical Physics 40, no. 5 (September 1999): 989–94. http://dx.doi.org/10.1007/bf02468487.

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4

Zenit, Roberto, and Melany L. Hunt. "Mechanics of Immersed Particle Collisions." Journal of Fluids Engineering 121, no. 1 (March 1, 1999): 179–84. http://dx.doi.org/10.1115/1.2821999.

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The present work investigates the mechanics of particle collisions submerged in a liquid using a simple pendulum experiment. Particle trajectories for different particles in water are measured using a high-speed digital camera and the magnitude of the collision is recorded using a high-frequency-response pressure transducer at the colliding surface. The particle deceleration occurs at distances less than half a particle diameter from the wall. The measured collision impulse increases with impact velocity and particle mass. Comparisons are drawn between the measured pressures and the prediction

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5

Lin, Jian-Hung, and Keh-Chin Chang. "A Modeling Study on Particle Dispersion in Wall-Bounded Turbulent Flows." Advances in Applied Mathematics and Mechanics 6, no. 06 (December 2014): 764–82. http://dx.doi.org/10.4208/aamm.2014.m533.

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AbstractThree physical mechanisms which may affect dispersion of particle’s motion in wall-bounded turbulent flows, including the effects of turbulence, wall roughness in particle-wall collisions, and inter-particle collisions, are numerically investigated in this study. Parametric studies with different wall roughness extents and with different mass loading ratios of particles are performed in fully developed channel flows with the Eulerian-Lagrangian approach. A low-Reynolds-numberk–εturbulence model is applied for the solution of the carrier-flow field, while the deterministic Lagrangian me

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6

Kempe, Tobias, and Jochen Fröhlich. "Collision modelling for the interface-resolved simulation of spherical particles in viscous fluids." Journal of Fluid Mechanics 709 (August 23, 2012): 445–89. http://dx.doi.org/10.1017/jfm.2012.343.

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AbstractThe paper presents a model for particle–particle and particle–wall collisions during interface-resolving numerical simulations of particle-laden flows. The accurate modelling of collisions in this framework is challenging due to methodological problems generated by interface approach and contact as well as due to the greatly different time scales involved. To cope with this situation, multiscale modelling approaches are introduced avoiding excessive local grid refinement during surface approach and time step reduction during the surface contact. A new adaptive model for the normal forc

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Zhang, Xia, and Lixing Zhou. "A second-order moment particle–wall collision model accounting for the wall roughness." Powder Technology 159, no. 2 (November 2005): 111–20. http://dx.doi.org/10.1016/j.powtec.2005.07.005.

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8

Cheng, Jiarui, Yihua Dou, Ningsheng Zhang, Zhen Li, and Zhiguo Wang. "A New Method for Predicting Erosion Damage of Suddenly Contracted Pipe Impacted by Particle Cluster via CFD-DEM." Materials 11, no. 10 (September 28, 2018): 1858. http://dx.doi.org/10.3390/ma11101858.

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A numerical study on the erosion of particle clusters in an abrupt pipe was conducted by means of the combined computational fluid dynamics (CFD) and discrete element methods (DEM). Furthermore, a particle-wall extrusion model and a criterion for judging particle collision interference were developed to classify and calculate the erosion rate caused by different interparticle collision mechanisms in a cluster. Meanwhile, a full-scale pipe flow experiment was conducted to confirm the effect of a particle cluster on the erosion rate and to verify the calculated results. The reducing wall was mad

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9

BOURGADE, JEAN-PIERRE. "A COUPLED SPHERICAL HARMONICS EXPANSION MODEL FOR CONFINED PARTICLES." Mathematical Models and Methods in Applied Sciences 14, no. 08 (August 2004): 1133–65. http://dx.doi.org/10.1142/s021820250400357x.

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Our goal in this paper is to derive from a kinetic setting a diffusion model for the transport of charged particles trapped in a surface potential. The so-obtained model is derived through a diffusion approximation, as we assume the thermalization to be governed by particle-wall collisions. In order to take into account the possible inelasticity of such collisions, we introduce a nonlocal (in energy) collision operator on the boundary. At the macroscopic scale, this results in a coupled (in energy) Spherical Harmonics Expansion (SHE) model. The model is both formally and rigorously derived fro

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10

Gui, Nan, Xingtuan Yang, Jiyuan Tu, and Shengyao Jiang. "A generalized particle-to-wall collision model for non-spherical rigid particles." Advanced Powder Technology 27, no. 1 (January 2016): 154–63. http://dx.doi.org/10.1016/j.apt.2015.12.002.

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11

Roisman, I. V., and C. Tropea. "Impact of a crushing ice particle onto a dry solid wall." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 471, no. 2183 (November 2015): 20150525. http://dx.doi.org/10.1098/rspa.2015.0525.

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This is a theoretical study about ice particle impact onto a rigid wall. It is motivated by the need to model the process of ice crystal accretion or damage caused by an ice particle impacts. A quasi-one-dimensional model of ice particle impact and deformation is developed. Spherical, cylindrical and conical shapes of the ice crystals are analysed. The model is able to predict particle residual height, the force produced by impact and the collision duration. The theoretical predictions agree well with the available experimental data.

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12

Vigolo, D., I. M. Griffiths, S. Radl, and H. A. Stone. "An experimental and theoretical investigation of particle–wall impacts in a T-junction." Journal of Fluid Mechanics 727 (June 20, 2013): 236–55. http://dx.doi.org/10.1017/jfm.2013.200.

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AbstractUnderstanding the behaviour of particles entrained in a fluid flow upon changes in flow direction is crucial in problems where particle inertia is important, such as the erosion process in pipe bends. We present results on the impact of particles in a T-shaped channel in the laminar–turbulent transitional regime. The impacting event for a given system is described in terms of the Reynolds number and the particle Stokes number. Experimental results for the impact are compared with the trajectories predicted by theoretical particle-tracing models for a range of configurations to determin

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13

Ji, Shi Ming, J. L. Xu, Li Zhang, Ming Sheng Jin, Y. H. Yang, and Y. Wang. "Motion Model and Numerical Simulation of Fluid and Abrasive Particle in Near Wall Region." Materials Science Forum 626-627 (August 2009): 237–42. http://dx.doi.org/10.4028/www.scientific.net/msf.626-627.237.

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The paper discusses the near wall region of soft abrasive particle flow in weak force finish machining method. Turbulent flow morphology in near wall region of rectangular channel with different viscosity is numerically simulated and compared. Through the analysis of kinetic equation of abrasive particle, the abrasive particle motion trace of different diameter in turbulent flow with different viscosity is simulated and compared. The result reveals the condition under which the fluids with different viscosity can form Turbulent flow is different. The greater the viscosity is, the greater the v

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14

Li, Xiaobai, Melany L. Hunt, and Tim Colonius. "A contact model for normal immersed collisions between a particle and a wall." Journal of Fluid Mechanics 691 (December 1, 2011): 123–45. http://dx.doi.org/10.1017/jfm.2011.461.

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AbstractThe incompressible Navier–Stokes equations are solved numerically to predict the coupled motion of a falling particle and the surrounding fluid as the particle impacts and rebounds from a planar wall. The method is validated by comparing the numerical simulations of a settling sphere with experimental measurements of the sphere trajectory and the accompanying flow field. The normal collision process is then studied for a range of impact Stokes numbers. A contact model of the liquid–solid interaction and elastic effect is developed that incorporates the elasticity of the solids to permi

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15

Ozolins, Ansis, and Uldis Strautins. "SIMPLE MODELS FOR WALL EFFECT IN FIBER SUSPENSION FLOWS." Mathematical Modelling and Analysis 19, no. 1 (February 20, 2014): 75–84. http://dx.doi.org/10.3846/13926292.2014.893263.

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Jeffery's equation describes the dynamics of a non-inertial ellipsoidal particle immersed in a Stokes liquid and is used in various models of fiber suspension flow. However, it is not valid in close neighbourhood of a rigid wall. Geometrically impossible orientation states with the fiber penetrating the wall can result from this model. This paper proposes a modification of Jeffery's equation in close proximity to a wall so that the geometrical constraints are obeyed by the solution. A class of models differing in the distribution between the translational and rotational part of the response to

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16

Daghooghi, Mohsen, and Iman Borazjani. "A kinematics-based model for the settling of gravity-driven arbitrary-shaped particles on a surface." PLOS ONE 16, no. 2 (February 9, 2021): e0243716. http://dx.doi.org/10.1371/journal.pone.0243716.

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A discrete model is proposed for settling of an arbitrary-shaped particle onto a flat surface under the gravitational field. In this method, the particle dynamics is calculated such that (a) the particle does not create an overlap with the wall and (b) reaches a realistic equilibrium state, which are not guaranteed in the conventional discrete element methods that add a repulsive force (torque) based on the amount of overlap between the particle and the wall. Instead, upon the detection of collision, the particle’s kinematics is modified depending on the type of contact, i.e., point, line, and

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17

Lixing, Zhou, and Zhang Xia. "Simulation of sudden-expansion and swirling gas-particle flows using a two-fluid particle-wall collision model with consideration of the wall roughness." Acta Mechanica Sinica 20, no. 5 (October 2004): 447–54. http://dx.doi.org/10.1007/bf02484266.

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18

Pan, Heng, Robert G. Landers, and Frank Liou. "Dynamic Modeling of Powder Delivery Systems in Gravity-Fed Powder Feeders." Journal of Manufacturing Science and Engineering 128, no. 1 (July 11, 2005): 337–45. http://dx.doi.org/10.1115/1.2120778.

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This paper presents an approach for modeling powder delivery system dynamics in low flow rate applications. Discrete particle modeling (DPM) is utilized to analyze the motion of individual powder particles. In DPM, an irregular bouncing model is employed to represent the powder dispersion in the powder delivery system induced by non-spherical particle-wall collisions. A three-dimensional friction collision model is utilized to simulate the interactions between particles and the powder delivery system walls. The modeling approach is experimentally verified and simulation studies are conducted t

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19

Goswami, Partha S., and V. Kumaran. "Particle dynamics in the channel flow of a turbulent particle–gas suspension at high Stokes number. Part 2. Comparison of fluctuating force simulations and experiments." Journal of Fluid Mechanics 687 (October 6, 2011): 41–71. http://dx.doi.org/10.1017/jfm.2011.295.

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AbstractThe particle and fluid velocity fluctuations in a turbulent gas–particle suspension are studied experimentally using two-dimensional particle image velocimetry with the objective of comparing the experiments with the predictions of fluctuating force simulations. Since the fluctuating force simulations employ force distributions which do not incorporate the modification of fluid turbulence due to the particles, it is of importance to quantify the turbulence modification in the experiments. For experiments carried out at a low volume fraction of $9. 15\ensuremath{\times} 1{0}^{\ensuremat

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20

Kartushinsky, Alexander, and Efstathios E. Michaelides. "Gas–Solid Particle Flow in Horizontal Channels: Decomposition of the Particle-Phase Flow and Interparticle Collision Effects." Journal of Fluids Engineering 129, no. 6 (November 13, 2006): 702–12. http://dx.doi.org/10.1115/1.2734202.

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This paper examines the turbulent flow of heavy particles in horizontal channels and pipes. Calculations for the fluid are performed within an Eulerian frame of reference, while the particulate phase is considered as several continuous polydisperse media, each constituting a separate phase. The interparticle collisions include two mechanisms: collisions with sliding friction and collisions without sliding friction. The collisions of particles are accounted for, by collisions due to the difference in the average and fluctuating velocities of the several particulate fractions. This work introduc

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21

Niazi Ardekani, M., P. Costa, W. P. Breugem, F. Picano, and L. Brandt. "Drag reduction in turbulent channel flow laden with finite-size oblate spheroids." Journal of Fluid Mechanics 816 (February 28, 2017): 43–70. http://dx.doi.org/10.1017/jfm.2017.68.

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We study suspensions of oblate rigid particles in a viscous fluid for different values of the particle volume fractions. Direct numerical simulations have been performed using a direct-forcing immersed boundary method to account for the dispersed phase, combined with a soft-sphere collision model and lubrication corrections for short-range particle–particle and particle–wall interactions. With respect to the single-phase flow, we show that in flows laden with oblate spheroids the drag is reduced and the turbulent fluctuations attenuated. In particular, the turbulence activity decreases to lowe

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22

ZENIT, R., and M. L. HUNT. "The impulsive motion of a liquid resulting from a particle collision." Journal of Fluid Mechanics 375 (November 25, 1998): 345–61. http://dx.doi.org/10.1017/s0022112098002596.

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When two particles collide in a liquid, the impulsive acceleration due to the rebound produces a pressure pulse that is transmitted through the fluid. Detailed measurements were made of the pressure pulse and the motion of the particles by generating controlled collisions with an immersed dual pendulum. The experiments were performed for a range of impact velocities, angles of incidence, and distances between the wall and the pairs of particles. The radiated fluid pressure was measured using a high-frequency-response pressure transducer, and the motion of the particles was recorded using a hig

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23

Ardekani, M. Niazi, and L. Brandt. "Turbulence modulation in channel flow of finite-size spheroidal particles." Journal of Fluid Mechanics 859 (November 26, 2018): 887–901. http://dx.doi.org/10.1017/jfm.2018.854.

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Finite-size particles modulate wall-bounded turbulence, leading, for the case of spherical particles, to increased drag also owing to the formation of a particle wall layer. Here, we study the effect of particle shape on the turbulence in suspensions of spheroidal particles at volume fraction $\unicode[STIX]{x1D719}=10\,\%$ and show how the near-wall particle dynamics deeply changes with the particle aspect ratio and how this affects the global suspension behaviour. Direct numerical simulations are performed using a direct-forcing immersed boundary method to account for the dispersed phase, co

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24

Quintero, Brian, Santiago Laín, and Martin Sommerfeld. "Derivation and validation of a hard-body particle-wall collision model for non-spherical particles of arbitrary shape." Powder Technology 380 (March 2021): 526–38. http://dx.doi.org/10.1016/j.powtec.2020.11.032.

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25

Pan, Yadi, Shuya Shan, Yao Wei, Feng Ji, Jinping Weng, Yulan Tian, and Jin Qian. "Study on the fiber fouling in drying exhaust heat utilization of wood industry." E3S Web of Conferences 38 (2018): 01003. http://dx.doi.org/10.1051/e3sconf/20183801003.

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Based on the viscoelastic and creep deformation properties, a new deposition mechanism model for slender wood fiber particles in wast heat utilization is proposed in this paper. And the equivalent sphere method is used to describe the particle feature size in the model. With the proposed deposition model of flexible slender particles, the critical criteria are obtained. The influence of particle size, aspect ratio and damping factor on particle deposition has been investigated. The results indicate that particle deposition increases with the particle size decrease, aspect ratio and damping fac

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26

Chinappi, M., and E. De Angelis. "Confined dynamics of a single DNA molecule." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 369, no. 1944 (June 13, 2011): 2329–36. http://dx.doi.org/10.1098/rsta.2011.0096.

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The effect of a slit-like confinement on the relaxation dynamics of DNA is studied via a mesoscale model in which a bead and spring model for the polymer is coupled to a particle-based Navier–Stokes solver (multi-particle collision dynamics). The confinement is found to affect the equilibrium stretch of the chain when the bulk gyration radius is comparable to or smaller than the channel height and our data are in agreement with the ( R g,bulk / h ) 1/4 scaling of the polymer extension in the wall tangential direction. Relaxation simulation at different confinements indicates that, while the ov

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27

Dong, Yunshan, Zongliang Qiao, Fengqi Si, Bo Zhang, Cong Yu, and Xiaoming Jiang. "A Novel Method for the Prediction of Erosion Evolution Process Based on Dynamic Mesh and Its Applications." Catalysts 8, no. 10 (September 30, 2018): 432. http://dx.doi.org/10.3390/catal8100432.

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Particle erosion is a commonly occurring phenomenon, and it plays a significantly important role in service life. However, few simulations have replicated erosion, especially the detailed evolution process. To address this complex issue, a new method for establishing the solution of the erosion evolution process was developed. The approach is introduced with the erosion model and the dynamic mesh. The erosion model was applied to estimate the material removal of erosion, and the dynamic mesh technology was used to demonstrate the surface profile of erosion. Then, this method was applied to sol

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28

Ye, Huilin, Zhiqiang Shen, and Ying Li. "Interplay of deformability and adhesion on localization of elastic micro-particles in blood flow." Journal of Fluid Mechanics 861 (December 19, 2018): 55–87. http://dx.doi.org/10.1017/jfm.2018.890.

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The margination and adhesion of micro-particles (MPs) have been extensively investigated separately, due to their important applications in the biomedical field. However, the cascade process from margination to adhesion should play an important role in the transport of MPs in blood flow. To the best of our knowledge, this has not been explored in the past. Here we numerically study the margination behaviour of elastic MPs to blood vessel walls under the interplay of their deformability and adhesion to the vessel wall. We use the lattice Boltzmann method and molecular dynamics to solve the flui

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Filipovic, N., M. Kojic, and A. Tsuda. "Modelling thrombosis using dissipative particle dynamics method." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 366, no. 1879 (July 2008): 3265–79. http://dx.doi.org/10.1098/rsta.2008.0097.

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Aim . Arterial occlusion is a leading cause of cardiovascular disease. The main mechanism causing vessel occlusion is thrombus formation, which may be initiated by the activation of platelets. The focus of this study is on the mechanical aspects of platelet-mediated thrombosis which includes the motion, collision, adhesion and aggregation of activated platelets in the blood. A review of the existing continuum-based models is given. A mechanical model of platelet accumulation onto the vessel wall is developed using the dissipative particle dynamics (DPD) method in which the blood (i.e. colloida

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Mansoor, M. M., J. O. Marston, J. Uddin, G. Christopher, Z. Zhang, and S. T. Thoroddsen. "Cavitation structures formed during the collision of a sphere with an ultra-viscous wetted surface." Journal of Fluid Mechanics 796 (May 5, 2016): 473–515. http://dx.doi.org/10.1017/jfm.2016.229.

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We investigate the inception of cavitation and resulting structures when a sphere collides with a solid surface covered with a layer of non-Newtonian liquid having a kinematic viscosity of up to ${\it\nu}_{0}=20\,000\,000$ cSt. We show the existence of shear-stress-induced cavitation during sphere approach towards the base wall (i.e. the pressurization stage) in ultra-viscous films using a synchronized dual-view high-speed imaging system. For the experimental parameters employed, liquids having viscoelastic properties of $De\geqslant O(1)$ are shown to enable sphere rebound without any prior c

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Shi, Ruifang, Jianzhong Lin, Hailin Yang, and Mingzhou Yu. "Distribution of non-spherical nanoparticles in turbulent flow of ventilation chamber considering fluctuating particle number density." Applied Mathematics and Mechanics 42, no. 3 (February 11, 2021): 317–30. http://dx.doi.org/10.1007/s10483-021-2707-8.

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AbstractThe Reynolds-averaged general dynamic equation (RAGDE) for the nanoparticle size distribution function is derived, including the contribution to particle coagulation resulting from the fluctuating concentration. The equation together with that of a turbulent gas flow is solved numerically in the turbulent flow of a ventilation chamber with a jet on the wall based on the proposed model relating the fluctuating coagulation to the gradient of mean concentration. Some results are compared with the experimental data. The results show that the proposed model relating the fluctuating coagulat

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Li, Liqun, Yichen Huang, Chunyu Zou, and Wang Tao. "Numerical Study on Powder Stream Characteristics of Coaxial Laser Metal Deposition Nozzle." Crystals 11, no. 3 (March 12, 2021): 282. http://dx.doi.org/10.3390/cryst11030282.

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A 3D model was established to accurately simulate the internal and external powder stream characteristics of the coaxial discrete three-beam nozzle for laser metal deposition. A k-ε turbulence model was applied in the gas flow phase, and powder flow was coupled to the gas flow by a Euler-Lagrange approach as a discrete phase model. The simulated powder stream morphology was in good agreement with the experimental results of CCD and high-speed camera imaging. The simulation results showed that the length, diameter and shrinkage angle of the powder passage in the nozzle have different effects on

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Ji, Shi Ming, J. Q. Zhong, Da Peng Tan, and Y. W. Chi. "Research of Distribution and Dynamic Characteristic of Particle Group in the Structural Flow Passage." Key Engineering Materials 499 (January 2012): 271–76. http://dx.doi.org/10.4028/www.scientific.net/kem.499.271.

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Because of the liquid phase’s driving action, particles would be collided the surface and impacted with each other in the flow passage, the surface will be machined though the continuous action of impact force and friction force. The finishing results of structural surface is related to the collision frequency and the pressure, abrasion situation in different area of the structural surface can be analyzed obviously by investigating dynamic characteristic and distribution of particle group. Based on coupled wave theory of liquid-solid two phases flow, using mixture model which belongs to Euler-

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Aretxabaleta, Xabier M., Marina Gonchenko, Nathan L. Harshman, Steven Glenn Jackson, Maxim Olshanii, and Grigory E. Astrakharchik. "The Dynamics of Digits: Calculating Pi with Galperin’s Billiards." Mathematics 8, no. 4 (April 2, 2020): 509. http://dx.doi.org/10.3390/math8040509.

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In Galperin billiards, two balls colliding with a hard wall form an analog calculator for the digits of the number π . This classical, one-dimensional three-body system (counting the hard wall) calculates the digits of π in a base determined by the ratio of the masses of the two particles. This base can be any integer, but it can also be an irrational number, or even the base can be π itself. This article reviews previous results for Galperin billiards and then pushes these results farther. We provide a complete explicit solution for the balls’ positions and velocities as a function of the col

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Zhao, Wandong, Ying Zhang, Wenqiang Shang, Zhaotai Wang, Ben Xu, and Shuisheng Jiang. "Simulation of droplet impacting a square solid obstacle in microchannel with different wettability by using high density ratio pseudopotential multiple-relaxation-time (MRT) lattice Boltzmann method (LBM)." Canadian Journal of Physics 97, no. 1 (January 2019): 93–113. http://dx.doi.org/10.1139/cjp-2018-0126.

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In this paper, a pseudopotential high density ratio (DR) lattice Boltzmann model was developed by incorporating multi-relaxation-time collision matrix, large DR external force term, surface tension adjustment external force term, and solid–liquid pseudopotential force. It was found that the improved model can precisely capture the two-phase interface at high DR. Besides, the effects of initial Reynolds number, Weber number, solid wall contact angle (CA), ratio of obstacle size to droplet diameter (χ1), and ratio of channel width to droplet diameter (χ2) on the deformation and breakup of a drop

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KELBALIEV, Gudrat Isfandiyar ogly, Sakit Rauf ogly RASULOV, and Niyaz Gadym ogly VALIEV. "Mathematical modeling of sedimentation processes and surfacing of solids, droplets and bubbles in an isotropic turbulent flow." NEWS of the Ural State Mining University, no. 4 (December 20, 2020): 123–45. http://dx.doi.org/10.21440/2307-2091-2020-4-123-145.

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Relevance. The problems of separation, stratification and classification of disperse systems that constitute the base of sedimentation and phase displacement are determined by hydrodynamic structure and direction of the flow, physical interaction of forces of different nature of the systems, diffusion transport and deposition in turbulent flows, physical and chemical properties of the particles themselves and the carrier medium and many other factors. Appears the necessity of development of the model of solid spherical particles deposition from a volume with small values of number Re under the

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Bhonsale, Satyajeet, Lewis Scott, Mojtaba Ghadiri, and Jan Van Impe. "Numerical Simulation of Particle Dynamics in a Spiral Jet Mill via Coupled CFD-DEM." Pharmaceutics 13, no. 7 (June 23, 2021): 937. http://dx.doi.org/10.3390/pharmaceutics13070937.

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Spiral jet mills are ubiquitous in the pharmaceutical industry. Breakage and classification in spiral jet mills occur due to complex interactions between the fluid and the solid phases. The study of these interactions requires the use of computational fluid dynamics (CFD) for the fluid phase coupled with discrete element models (DEM) for the particle phase. In this study, we investigate particle dynamics in a 50-mm spiral jet mill through coupled CFD-DEM simulations. The simulations showed that the fluid was significantly decelerated by the presence of the particles in the milling chamber. Fur

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DE ALCANTARA BONFIM, O. F. "FERMI ACCELERATION IN A PERIODICALLY DRIVEN FERMI–ULAM MODEL." International Journal of Bifurcation and Chaos 22, no. 06 (June 2012): 1250140. http://dx.doi.org/10.1142/s0218127412501404.

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The dynamics of a particle bouncing between two harmonically vibrating walls is analyzed in the context of the static wall approximation. Fermi acceleration is observed for a wide range of the ratio between the frequencies of the oscillating walls and their relative phases. However, no acceleration is observed if the frequency ratio is an integer. In the phase versus frequency-ratio diagram, the region in which Fermi acceleration is observed is separated by an upper and lower boundary. At the lower boundary, after a large number of collisions, the particle average velocity increases with the s

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Kumar, Amit, Rafael G. Henríquez Rivera, and Michael D. Graham. "Flow-induced segregation in confined multicomponent suspensions: effects of particle size and rigidity." Journal of Fluid Mechanics 738 (December 13, 2013): 423–62. http://dx.doi.org/10.1017/jfm.2013.592.

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AbstractThe effects of particle size and rigidity on segregation behaviour in confined simple shear flow of binary suspensions of fluid-filled elastic capsules are investigated in a model system that resembles blood. We study this problem with direct simulations as well as with a master equation model that incorporates two key sources of wall-normal particle transport: wall-induced migration and hydrodynamic pair collisions. The simulation results indicate that, in a mixture of large and small particles with equal capillary numbers, the small particles marginate, while the large particles anti

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Devenish, B. J., D. C. Swailes, Y. A. Sergeev, and V. N. Kurdyumov. "A PDF model for dispersed particles with inelastic particle–wall collisions." Physics of Fluids 11, no. 7 (July 1999): 1858–68. http://dx.doi.org/10.1063/1.870048.

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Stefanovic, Predrag, Dejan Cvetinovic, Goran Zivkovic, Simeon Oka, and Pavle Pavlovic. "Numerical modeling of disperse material evaporation in axisymmetric thermal plasma reactor." Thermal Science 7, no. 1 (2003): 63–99. http://dx.doi.org/10.2298/tsci0301063s.

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A numerical 3D Euler-Lagrangian stochastic-deterministic (LSD) model of two-phase flow laden with solid particles was developed. The model includes the relevant physical effects, namely phase interaction, panicle dispersion by turbulence, lift forces, particle-particle collisions, particle-wall collisions, heat and mass transfer between phases, melting and evaporation of particles, vapour diffusion in the gas flow. It was applied to simulate the processes in thermal plasma reactors, designed for the production of the ceramic powders. Paper presents results of extensive numerical simulation pro

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Sheikh Mamoo, Mohammad, Ataallah Soltani Goharrizi, and Bahador Abolpour. "CFD SIMULATION OF EROSION BY PARTICLE COLLISION IN U-BEND AND HELICAL TYPE PIPES." Journal of the Serbian Society for Computational Mechanics 14, no. 2 (December 30, 2020): 1–13. http://dx.doi.org/10.24874/jsscm.2020.14.02.01.

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Erosion caused by solid particles in curve pipes is one of the major concerns in the oil and gas industries. Small solid particles flow with a carrier liquid fluid and impact the inner wall of the piping, valves, and other equipment. These components face a high risk of solid particle erosion due to the constant collision, which may result in equipment malfunctioning and even failure. In this study, the two-way coupled Eulerian-Lagrangian method with the Oka erosion and Grant and Tabakoff particle-wall rebound models approach is employed to simulate the liquid-solid flow in U-bend and helical

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Ray, M., F. Chowdhury, A. Sowinski, P. Mehrani, and A. Passalacqua. "An Euler-Euler model for mono-dispersed gas-particle flows incorporating electrostatic charging due to particle-wall and particle-particle collisions." Chemical Engineering Science 197 (April 2019): 327–44. http://dx.doi.org/10.1016/j.ces.2018.12.028.

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Burnard, David J., and William D. Griffiths. "A Model of Inclusion Behaviour in Liquid Aluminium." Materials Science Forum 765 (July 2013): 92–96. http://dx.doi.org/10.4028/www.scientific.net/msf.765.92.

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Inclusions in castings are particularly damaging as crack initiators, causing failure in service. It is therefore desirable to attempt to remove them prior to their entry into the casting. In this work the behaviour of inclusions was studied using a computer simulation to predict the movement of particles in flowing liquid metal. The computer simulation was created by a combination of Computational Fluid Dynamics (CFD) and Discrete Element Modelling (DEM), to try to predict the agglomeration characteristics of inclusions in liquid Al alloy in a launder system. The model was tailored to simulat

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CROIZET, C., and R. GATIGNOL. "BOLTZMANN-LIKE MODELLING OF A SUSPENSION." Mathematical Models and Methods in Applied Sciences 12, no. 07 (July 2002): 943–64. http://dx.doi.org/10.1142/s0218202502001970.

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This paper deals with the presentation of a kinetic model for a suspension of identical hard spheres. Considering that the collisions between particles are instantaneous, binary, inelastic and taking the diameter of the spheres into account, a Boltzmann equation for the dispersed phase is proposed. It allows one to obtain the conservation of mass and momentum as well as, for slightly inelastic collisions, an H-theorem which conveys the irreversibility of the evolution. The problem of the boundary conditions for the Boltzmann equation is then introduced. From an anisotropic law of rebound chara

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Zhao, Rui-Jie, You-Long Zhao, De-Sheng Zhang, Yan Li, and Lin-Lin Geng. "Numerical Investigation of the Characteristics of Erosion in a Centrifugal Pump for Transporting Dilute Particle-Laden Flows." Journal of Marine Science and Engineering 9, no. 9 (September 3, 2021): 961. http://dx.doi.org/10.3390/jmse9090961.

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Erosion in centrifugal pumps for transporting flows with dilute particles is a main pump failure problem in many engineering processes. A numerical model combining the computational fluid dynamics (CFD) and Discrete Element Method (DEM) is applied to simulate erosion in a centrifugal pump. Different models of the liquid-solid inter-phase forces are implemented, and the particle-turbulence interaction is also defined. The inertial particles considered in this work are monodisperse and have finite size. The numerical results are validated by comparing the results with a series of experimental da

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Fan, Jinchao, Benchun Yao, Yi Hao, Shimin Zhang, and Xiaoxiao Zhu. "Numerical Simulation of Slurry flow in horizontal pipe based on CFD-DEM." MATEC Web of Conferences 306 (2020): 01007. http://dx.doi.org/10.1051/matecconf/202030601007.

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In this paper, we propose a novel pipeline cleaning method utilizing slurry. The reason why slurry can be used for pipeline cleaning is that the collisions between the particles and the contaminant in the pipe wall can enhance the cleaning effect. A slurry with polypropylene particles embedded in water is used to cleaning a horizontal pipe is conducted to realize this method. Because the flow characteristics of the slurry is crucial for the cleaning process, it is valuable to conduct a simulation and investigate the influence of several different factors including the convey velocity and the p

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Panelli, Mario, Davide Morfei, Beniamino Milo, Francesco D’Aniello, and Francesco Battista. "Axisymmetric Hybrid Plasma Model for Hall Effect Thrusters." Particles 4, no. 2 (June 18, 2021): 296–324. http://dx.doi.org/10.3390/particles4020026.

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Hall Effect Thrusters (HETs) are nowadays widely used for satellite applications because of their efficiency and robustness compared to other electric propulsion devices. Computational modelling of plasma in HETs is interesting for several reasons: it can be used to predict thrusters’ operative life; moreover, it provides a better understanding of the physical behaviour of this device and can be used to optimize the next generation of thrusters. In this work, the discharge within the accelerating channel and near-plume of HETs has been modelled by means of an axisymmetric hybrid approach: a se

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Timmermans, C. J., R. J. Rosado, and D. C. Schram. "An Investigation of Non-Equilibrium Effects in Thermal Argon Plasmas." Zeitschrift für Naturforschung A 40, no. 8 (August 1, 1985): 810–25. http://dx.doi.org/10.1515/zna-1985-0804.

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The parameters and transport properties of a wall stabilized argon arc (40-200 A) at atmospheric pressure with diameters of 5 and 8 mm are studied by spectroscopy and interferometry. The plasma is assumed to be partial local thermal equilibrium and this assumption is verified with the aid of a collisional-radiative model. The departures from Saha-equilibrium of the argon neutral ground state are found to be associated with particle diffusion and the escape of recombination radiation. The measurement of the total excitation rate, from the ground level, including direct ionization, of neutral ar

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Sun, Baojiang, Hengfu Xiang, Hao Li, and Xiangfang Li. "Modeling of the Critical Deposition Velocity of Cuttings in an Inclined-Slimhole Annulus." SPE Journal 22, no. 04 (February 6, 2017): 1213–24. http://dx.doi.org/10.2118/185168-pa.

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Summary A coupled computational-fluid-dynamics/discrete-element-method (CFD/DEM) theory is developed to simulate the transportation of cuttings in an inclined-slimhole annulus. In this theory, the liquid phase is governed by the Eulerian continuum equation and the Navier-Stokes momentum-conservation equation. The collisions between particle and wall, between particle and drillstring, and among particles are treated as the spring-damping system, and the particle-contact model is then established. The particle-governing equation based on Newton's second law is established by analyzing the forces

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