Simulation of gas-liquid two-phase flow in a flow-focusing microchannel with the lattice Boltzmann method

doi:10.1088/1674-1056/acea6e

中国物理B ›› 2023, Vol. 32 ›› Issue (11): 114703-114703.doi: 10.1088/1674-1056/acea6e

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

收稿日期:2023-06-12 修回日期:2023-07-21 接受日期:2023-07-26 出版日期:2023-10-16 发布日期:2023-10-26
通讯作者: Huichen Zhang E-mail:hczhang@dlmu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 51775077).

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

Received:2023-06-12 Revised:2023-07-21 Accepted:2023-07-26 Online:2023-10-16 Published:2023-10-26
Contact: Huichen Zhang E-mail:hczhang@dlmu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 51775077).

摘要/Abstract

摘要： 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.

关键词: two-phase flow, lattice Boltzmann method, pressure drop, flow-focusing microchannel

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.

Key words: two-phase flow, lattice Boltzmann method, pressure drop, flow-focusing microchannel

中图分类号: (Multiphase flows)

47.61.Jd

47.11.Qr (Lattice gas) 02.60.Cb (Numerical simulation; solution of equations)

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[J]. 中国物理B, 2023, 32(11): 114703-114703.

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[J]. Chin. Phys. B, 2023, 32(11): 114703-114703.

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Simulation of gas-liquid two-phase flow in a flow-focusing microchannel with the lattice Boltzmann method

Simulation of gas-liquid two-phase flow in a flow-focusing microchannel with the lattice Boltzmann method

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