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

WU Chunxu; LI Junming

doi:10.11949/j.issn.0438-1157.20171309

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

更新时间：2025-12-10

- Numerical simulation of gas-liquid interface evolution for flow and condensation in square microchannel
- CIESC Journal Issue 7, Pages: 2851-2859(2018)
- 作者机构：
  
  清华大学能源与动力工程系, 热科学与动力工程教育部重点实验室,北京,100084
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20171309
  CLC： Q124
- Online First：05 July 2018，
  
  Published：05 July 2018
- 稿件说明：
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WU Chunxu, LI Junming. Numerical simulation of gas-liquid interface evolution for flow and condensation in square microchannel[J]. CIESC Journal, 2018, (7): 2851-2859.
DOI：

WU Chunxu, LI Junming. Numerical simulation of gas-liquid interface evolution for flow and condensation in square microchannel[J]. CIESC Journal, 2018, (7): 2851-2859. DOI： 10.11949/j.issn.0438-1157.20171309.

摘要

基于VOF模型，模拟了R32在水力直径为50 μm的方形微通道内流动凝结时的气液两相流型演进过程，模拟涉及的流型包括环状流、喷射流、泡状流和收缩泡状流。模拟结果显示，由于沿通道周向气液界面存在曲率差异，凝结液内部存在表面张力导致的横向压力梯度，驱使凝结液流向通道壁面拐角处，减薄通道壁面中部液膜厚度。基于势能最小原理，解释了表面张力与界面黏性力主导的喷射流形成机理。小质量流率时，喷射流诱发环状流上游气液界面波动，界面波动在界面黏性力的作用下逐渐生长。这与大质量流率时，流向下游并逐渐生长的界面波动导致流型转换的机理不同。

Abstract

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”.

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