Flow Patterns in the Sedimentation of a Capsule-Shaped Particle
NIE De-Ming1, LIN Jian-Zhong1,2**, ZHANG Kai1
1Institute of Fluid Mechanics, China Jiliang University, Hangzhou 310018 2State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027
Abstract：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 of π/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 and π/2. We conduct a detailed study on the effects of density ratio on the transition from the vertical sedimentation mode to horizontal sedimentation mode.
. [J]. 中国物理快报, 2012, 29(8): 84703-084703.
NIE De-Ming, LIN Jian-Zhong, and ZHANG Kai. Flow Patterns in the Sedimentation of a Capsule-Shaped Particle. Chin. Phys. Lett., 2012, 29(8): 84703-084703.
2012, Vol. 29 
