| 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.
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| 发表期刊 | PHYSICS OF FLUIDS
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| 2013-09-18
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| 卷号 | 25期号:9页码:093302/1-093302/14 |
| ISSN | 1070-6631
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| 摘要 | Instability 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. |
| 关键词 | Aspect Ratio
Fibers
Reynolds Number
Suspensions (Fluids)
Cross-stream Migration
Dilute Suspensions
Finite Reynolds Number
Lattice Boltzmann Simulations
Nonspherical Particle
Particle Aspect Ratios
Particle Suspensions
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| 学科领域 | 流体力学
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| URL | 查看原文
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| 收录类别 | SCI
; EI
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| 语种 | 英语
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| WOS记录号 | WOS:000325397800041
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| 课题组名称 | LNM湍流
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| 论文分区 | 一类/力学重要期刊
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| 引用统计 |
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| 文献类型 | 期刊论文
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| 条目标识符 | http://dspace.imech.ac.cn/handle/311007/47530
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| 专题 | 非线性力学国家重点实验室
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| 通讯作者 | Qi, DW (reprint author), Western Michigan Univ, Dept Chem & Paper Engn, Kalamazoo, MI 49009 USA. |
推荐引用方式
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.
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| 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.
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| 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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