Lateral Migration and Nonuniform Rotation of Biconcave Particle Suspended inPoiseuille Flow  

作　　者：WEN Bing-Hai CHEN Yan-Yan ZHANG Ren-Liang ZHANG Chao-Ying FANG Hai-Ping 闻炳海;陈艳燕;张任良;张超英;方海平(Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800;University of Chinese Academy of Sciences,Beijing 100049;College of Computer Science and Information Engineering,Guangxi Normal University,Guilin 541004;Department of Physics,Zhejiang Normal University,Jinhua 321004)

机构地区：[1]Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800 [2]University of Chinese Academy of Sciences,Beijing 100049 [3]College of Computer Science and Information Engineering,Guangxi Normal University,Guilin 541004 [4]Department of Physics,Zhejiang Normal University,Jinhua 321004

出　　处：《Chinese Physics Letters》2013年第6期114-117,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 10825520 and 11162002;the National Basic Research Program of China under Grant No 2012CB932400.

摘　　要：A biconcave particle suspended in a Poiseuille flow is investigated by the multiple-relaxation-time lattice Boltzmann method with the Galilean-invariant momentum exchange method.The lateral migration and equilibrium of the particle are similar to the Segré-Silberberg effect in our numerical simulations.Surprisingly,two lateral equilibrium positions are observed corresponding to the releasing positions of the biconcave particle.The upper equilibrium positions significantly decrease with the increasing Reynolds number,whereas the lower ones are almost insensitive to the Reynolds number.Interestingly,the regular wave accompanied by nonuniform rotation is exhibited in the lateral movement of the biconcave particle.It can be attributed to the fact that the biconcave shape in various postures interacts with the parabolic velocity distribution of the Poiseuille flow.A set of contours illustrate the dynamic flow field when the biconcave particle has successive postures in a rotating period.

关 键 词：flow. CONCAVE POSITIONS 

分 类 号：O17[理学—数学]