Surface wettability effect on carbon dioxide-water two-phase flow and mass transfer in rectangular microchannel

SUN Junjie; HAO Tingting; MA Xuehu; LAN Zhong

doi:10.11949/j.issn.0438-1157.20151050

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Surface wettability effect on carbon dioxide-water two-phase flow and mass transfer in rectangular microchannel

更新时间：2025-12-10

- Surface wettability effect on carbon dioxide-water two-phase flow and mass transfer in rectangular microchannel
- CIESC Journal Issue 9, Pages: 3405-3412(2015)
- 作者机构：
  
  辽宁省化工资源清洁利用重点实验室, 大连理工大学化学工程研究所,辽宁,大连,116024
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20151050
  CLC： Q021.1
- Online First：05 September 2015，
  
  Published：05 September 2015
- 稿件说明：
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SUN Junjie, HAO Tingting, MA Xuehu, et al. Surface wettability effect on carbon dioxide-water two-phase flow and mass transfer in rectangular microchannel[J]. CIESC Journal, 2015, (9): 3405-3412.
DOI：

SUN Junjie, HAO Tingting, MA Xuehu, et al. Surface wettability effect on carbon dioxide-water two-phase flow and mass transfer in rectangular microchannel[J]. CIESC Journal, 2015, (9): 3405-3412. DOI： 10.11949/j.issn.0438-1157.20151050.

摘要

在1 mm×1 mm矩形截面下微通道内

以二氧化碳-水为工作流体

研究壁面润湿性和气液表观流速对气-液两相流型和气液传质的影响

并研究了气、液表观流速对弹状流流体力学性质的影响。在亲水微通道中观测到了泡状流、泡状-弹状流、弹状流;在疏水微通道中观测到了非对称弹状流、拉长的非对称弹状流、分层流。实验表明亲水微通道中弹状流区域下气泡长度大体上随气相表观流速的增大而增大

随液相表观流速的增大而减小;液弹长度大体上随气相表观流速的增大而减小

随液相表观流速的增大先增大后减小;液侧体积传质系数kLa均随气、液相表观流速的增大而增大

随通道壁面润湿性的增强而增大。

Abstract

An experimental investigation was conducted with a high-speed camera to explore the hydrodynamics characteristics of slug flow in a microchannel with a cross-section of 1 mm×1 mm. Pure carbon dioxide and water were used as working fluids. The influence of superficial gas and liquid velocities and the wettability of microchannel on the two-phase flow pattern and mass transfer was investigated. In the hydrophilic microchannel

bubbly flow

bubbly-slug flow and slug flow were observed. In the hydrophobic microchannel

asymmetric slug flow

elongated asymmetric slug flow

stratified flow were found. It was shown that in slug flow of the hydrophilic microchannel

the length of bubble increased generally with the increase of superficial gas velocities and the decrease of superficial liquid velocities. The length of liquid slug decreased generally with the increase of superficial gas velocities

and increased firstly and then decreased generally with the increase of superficial liquid velocities. As the improvement of superficial gas and liquid velocities

the liquid volumetric mass transfer coefficient kLa increased. The liquid volumetric mass transfer coefficient kLa in the hydrophilic microchannel was higher than that in the hydrophobic microchannel.

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