Numerical simulation of gas-liquid interface evolution for flow and condensation in square microchannel

被引：0
|
作者：
Wu C. [1 ]
Li J. [1 ]
机构：
[1] Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing
来源：
Huagong Xuebao/CIESC Journal | 2018年 / 69卷 / 07期
基金：
中国国家自然科学基金;
关键词：
Condensation; Injection flow; Interfacial fluctuation; Microchannel;
D O I：
10.11949/j.issn.0438-1157.20171309
中图分类号：
学科分类号：
摘要：
Based on the fluid volume approach, the gas-liquid interface evolution for R32 flow and condensation in a square microchannel with 50 μm hydraulic diameter is studied. Annular, injection flow, bubbly flow and shrinking bubbly flow are simulated successively. Because of the gas-liquid interface curvature variation along the circumferential direction of channel, the existing surface tension generated transverse pressure gradient in the condensate film, which forces the condensate towards the corners and thins the condensate film at the middle of the wall of channel. A mechanism for the occurrence of injection flow dominated by the surface tension force and interface viscous force is proposed based on the minimum potential energy theory. The interface fluctuations on the annular flow upstream are induced by injection flow at low mass flux, and grow up gradually under interface viscous force which is different from the mechanism of "flow pattern transition at high mass flux being induced by interface fluctuations which grow up while flowing downstream". © All Right Reserved.
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页码：2851 / 2859
页数：8
相关论文
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