Simulation of vortex characteristics in a planar ψ-shaped branching microchannel with lattice Boltzmann method

Kai Feng () and Huichen Zhang
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Kai Feng: Naval Architecture and Ocean Engineering College, Dalian Maritime University, Dalian 116026, P. R. China
Huichen Zhang: Naval Architecture and Ocean Engineering College, Dalian Maritime University, Dalian 116026, P. R. China

International Journal of Modern Physics C (IJMPC), 2021, vol. 32, issue 03, 1-17

Abstract: The vortex in the branching microchannel enhances the mixing and heat transfer performance. To investigate the vortex intensity quantitatively, a lattice Boltzmann model for incompressible power-law fluid is developed by setting the range of lattice viscosity (0.001 ≤ν≤ 1). The validation of the current model is carried out by modeling the vortex in a T-shaped branching channel and the Poiseuille flow of power-law fluids. Then the vortex intensity in the ψ-shaped microchannel is numerically studied in terms of Reynolds number, branching angle and power-law index. The result indicates that both the recirculation length and height increase with the increase of the Reynolds number. The branching angle has a negative impact on the recirculation length, and it has little effect on the recirculation height. The influence of the power-law index on recirculation length and height depends on the Reynolds number.

Keywords: Vortex; power-law fluid; microchannel; lattice Boltzmann method (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1142/S0129183121500364

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