| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Simulation of gas-liquid two-phase flow in a flow-focusing microchannel with the lattice Boltzmann method |
| Kai Feng(冯凯), Gang Yang(杨刚), and Huichen Zhang(张会臣)† |
| Naval Architecture and Ocean Engineering College, Dalian Maritime University, Dalian 116026, China |
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Abstract A lattice Boltzmann method for gas-liquid two-phase flow involving non-Newtonian fluids is developed. Bubble formation in a flow-focusing microchannel is simulated by the method. The influences of flow rate ratio, surface tension, wetting properties, and rheological characteristics of the fluid on the two-phase flow are analyzed. The results indicate that the flow pattern transfers from slug flow to dry-plug flow with a sufficiently small capillary number. Due to the presence of three-phase contact lines, the contact angle has a more significant effect on the dry-plug flow pattern than on the slug flow pattern. The deformation of the front and rear meniscus of a bubble in the shear-thinning fluid can be explained by the variation of the capillary number. The reduced viscosity and increased contact angle are beneficial for the drag reduction in a microchannel. It also demonstrates the effectiveness of the current method to simulate the gas-liquid two-phase flow in a microchannel.
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Received: 12 June 2023
Revised: 21 July 2023
Accepted manuscript online: 26 July 2023
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PACS:
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47.61.Jd
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(Multiphase flows)
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47.11.Qr
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(Lattice gas)
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02.60.Cb
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(Numerical simulation; solution of equations)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51775077). |
Corresponding Authors:
Huichen Zhang
E-mail: hczhang@dlmu.edu.cn
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Cite this article:
Kai Feng(冯凯), Gang Yang(杨刚), and Huichen Zhang(张会臣) Simulation of gas-liquid two-phase flow in a flow-focusing microchannel with the lattice Boltzmann method 2023 Chin. Phys. B 32 114703
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