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Lattice Boltzmann simulations of sedimentation of a single fiber in a weak vertical shear flow
Qi DW; He GW(何国威); Liu YM; Qi, DW (reprint author), Western Michigan Univ, Dept Chem & Paper Engn, Kalamazoo, MI 49009 USA.
Source PublicationPHYSICS OF FLUIDS
2013-09-18
Volume25Issue:9Pages:093302/1-093302/14
ISSN1070-6631
AbstractInstability of a suspension is directly related to the problem of the cross-stream migration of a particle relative to its neighboring particle suspension. Such cross-stream or lateral migration of a single non-spherical particle (fiber) settling in a bounded weak shear flow with vertical streamlines produced by a perturbation to the fiber number density is studied using lattice Boltzmann simulations. The present simulation results demonstrate that at a given shear rate, the lateral migration can be divided into three phases depending on settling Reynolds number R-sd and particle aspect ratio kappa. At a low settling Reynolds number R-sd, the suspension becomes more stable in phase 1. As R-sd increases and excesses a critical settling Reynolds number R-sd1, the fiber suspension becomes unstable in phase 2. In phase 3, at an enough large R-sd, the inertia dominates the weak shear flow and it may have little effect on stability. A mechanism of the instability induced by an inertial fiber orientation drift and a shear induced cross-streamline drift, recently proposed by Shin, Koch, and Subramanian ["Structure and dynamics of dilute suspensions of finite reynolds number settling fibers," Phys. Fluids 21, 123304 (2009)], is examined and confirmed.
KeywordAspect Ratio Fibers Reynolds Number Suspensions (Fluids) Cross-stream Migration Dilute Suspensions Finite Reynolds Number Lattice Boltzmann Simulations Nonspherical Particle Particle Aspect Ratios Particle Suspensions
Subject Area流体力学
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000325397800041
DepartmentLNM湍流
Classification一类/力学重要期刊
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/47530
Collection非线性力学国家重点实验室
Corresponding AuthorQi, DW (reprint author), Western Michigan Univ, Dept Chem & Paper Engn, Kalamazoo, MI 49009 USA.
Recommended Citation
GB/T 7714
Qi DW,He GW,Liu YM,et al. Lattice Boltzmann simulations of sedimentation of a single fiber in a weak vertical shear flow[J]. PHYSICS OF FLUIDS,2013,25(9):093302/1-093302/14.
APA Qi DW,何国威,Liu YM,&Qi, DW .(2013).Lattice Boltzmann simulations of sedimentation of a single fiber in a weak vertical shear flow.PHYSICS OF FLUIDS,25(9),093302/1-093302/14.
MLA Qi DW,et al."Lattice Boltzmann simulations of sedimentation of a single fiber in a weak vertical shear flow".PHYSICS OF FLUIDS 25.9(2013):093302/1-093302/14.
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