化工学报2015，Vol.66Issue(9)：3405-3412,8.DOI:10.11949/j.issn.0438-1157.20151050
壁面润湿性对微通道内二氧化碳-水两相流流动及传质性能的影响
Surface wettability effect on carbon dioxide-water two-phase flow and mass transfer in rectangular microchannel
摘要
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.关键词
微通道/气-液两相流/弹状流/流体力学性质/传质/亲水/疏水Key words
microchannel/gas-liquid two-phase flow/slug flow/hydrodynamics characteristics/mass transfer/hydrophilic/hydrophobic分类
化学化工引用本文复制引用
孙俊杰,郝婷婷,马学虎,兰忠..壁面润湿性对微通道内二氧化碳-水两相流流动及传质性能的影响[J].化工学报,2015,66(9):3405-3412,8.基金项目
国家自然科学基金项目(21476037) （21476037）
高等学校博士学科点专项科研基金(20120041110018).supported by the National Natural Science Foundation of China (21476037) and Doctoral Program Foundation of Institutions of Higher Education of China (20120041110018). （20120041110018）
