Flow Patterns in the Sedimentation of a Capsule-Shaped Particle  

作　　者：NIE De-Ming LIN Jian-Zhong ZHANG Kai 聂德明;林建忠;张凯(Institute of Fluid Mechanics,China Jiliang University,Hangzhou 310018;State Key Laboratory of Fluid Power Transmission and Control,Zhejiang University,Hangzhou 310027)

机构地区：[1]Institute of Fluid Mechanics,China Jiliang University,Hangzhou 310018 [2]State Key Laboratory of Fluid Power Transmission and Control,Zhejiang University,Hangzhou 310027

出　　处：《Chinese Physics Letters》2012年第8期160-163,共4页中国物理快报（英文版）

基　　金：Supported by National Basic Research Program of China(No 2011CB706501).

摘　　要：The main objective of this study is to numerically investigate the settling of a capsule-shaped particle in an infinitely long channel by the newly developed LB-DF/FD method.This work will focus on the effects of the particle orientation and particle/fluid density ratio on the flow patterns during sedimentation.As the density ratio is varied,our results show that there are four distinct modes of sedimentation:vertical sedimentation,horizontal sedimentation,periodically oscillating sedimentation and chaotic mode where the particle is released from the center of the domain with an initial inclination ofπ/4 to break the symmetry.Furthermore,we also numerically investigate the flow patterns where the particle is released with an initial inclination of 0,π/6,π/3 andπ/2.We conduct a detailed study on the effects of density ratio on the transition from the vertical sedimentation mode to horizontal sedimentation mode.

关 键 词：method INFINITELY OSCILLATING 

分 类 号：O35[理学—流体力学]