Lattice Boltzmann Simulation of One Particle Migrating in a Pulsating Flow in Microvessel |
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Authors: | QIU Bing TAN Hui-Li LI Hua-Bing |
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Affiliation: | 1.School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China;2.School of Physical Science and Technology, Guangxi Normal University, Guilin 541004, China |
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Abstract: | A lattice Boltzmann model of two dimensions is used to simulate the movement of a single rigid particle suspended in a pulsating flow in micro vessel. The particle is as big as a red blood cell, and the micro vessel is four times as wide as the diameter of the particle. It is found that Segré-Silberberg effect will not respond to the pulsation of the flow when the Reynolds number is relatively high. However, when the Reynolds number is low enough, Segré-Silberberg effect disappears. In the steady flow, different initial position leads to different equilibrium positions. In a pulsating flow, different frequencies of pulsation also cause different equilibrium positions. Particularly, when the frequency of pulsation is closed to the human heart rate, Segré-Silberberg effect presents again. The evolutions of velocity, rotation, and trajectory of the particle are investigated to find the dynamics of such abnormal phenomenon. |
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Keywords: | Segré-Silberberg effect lattice Boltzmann method red blood cell pulsating flow |
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