| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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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 |
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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.
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Received: 20 February 2012
Published: 31 July 2012
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