中国物理B ›› 2023, Vol. 32 ›› Issue (11): 114703-114703.doi: 10.1088/1674-1056/acea6e
Kai Feng(冯凯), Gang Yang(杨刚), and Huichen Zhang(张会臣)†
Kai Feng(冯凯), Gang Yang(杨刚), and Huichen Zhang(张会臣)†
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.
中图分类号: (Multiphase flows)