十字微通道内大气液流速比下液相微分散特性  

Micro-dispersion Characteristics of Liquid Phase Under Large Gas-liquid Velocity Ratio in Cross Microchannel

作　　者：刘培卓 徐娜 许鑫 张玮 张永海 LIU Peizhuo;XU Na;XU Xin;ZHANG Wei;ZHANG Yonghai(Shanxi Key Laboratory of Chemical Product Engineering,College of Chemical Engineering and Technology,Taiyuan University of Technology,Taiyuan 030024,China;Shanxi Coking Coal in Yuncheng Salt Refco Group Ltd,Yuncheng 044000,China;School of Chemical Engineering and Technology,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]太原理工大学化学工程与技术学院,化学产品工程山西省重点实验室,太原030024 [2]山西焦煤运城盐化集团有限责任公司,运城044000 [3]西安交通大学化学工程与技术学院,西安710049

出　　处：《工程热物理学报》2024年第10期3091-3100,共10页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.21908152,No.22178241);西安交通大学青年创新团队(No.xtr052022011)。

摘　　要：微通道内两相流动中,分散相尺寸的大小和分布决定了相间热质传递性能。利用数值模拟方法,研究了大气液流速比情况下十字型微通道内分散方式和流速对液相分散过程的影响,发现对称式垂直流剪切分散方式较对称式错流剪切分散方式对液相的分散效果更好,流速提高在降低液相分散尺寸、提高两相流动扰动的同时,弱化了两种分散方式对液相分散效果的差距。分析了液相分散过程中气液两相流动体系内界面张力、黏性力、惯性力、通道压力等作用力的协同作用过程,揭示了分散方式和流速对液相分散过程的影响机制,并初步建立了对称式垂直流剪切分散方式下的液相分散模型,为强化微通道内气液两相流动热质传递性能及微通道的实际应用提供理论依据。In microchannel two-phase flow,the size and distribution of dispersed phase determine the heat and mass transfer performance between phases.The effects of dispersion mode and flow rate on the liquid phase dispersion process in the cross microchannel under the condition of large gasliquid velocity ratio were studied utilizing numerical simulation method in the present paper.It was found that the symmetric vertical-flow shear dispersion mode has better dispersion effect on the liquid phase than the symmetric cross-flow shear dispersion mode.The increase of flow rate reduces the liquid phase dispersion size and improves the two-phase flow disturbance,but weakens the difference between the dispersion effects of two dispersion modes on the liquid phase at the same time.The synergistic effect of interfacial tension,viscous force,inertial force and channel pressure existing in the gas-liquid two-phase flow system during the liquid phase dispersion process was analyzed in order to reveal the influence mechanism of dispersion mode and flow rate on the liquid phase dispersion.Besides,the liquid phase dispersion model under symmetrical vertical-flow shear dispersion mode was preliminarily established.The above study can provide a theoretical basis for strengthening the heat and mass transfer performance of gas-liquid two-phase flow in microchannels and the practical application of microchannels.

关 键 词：微通道 气液两相流 微分散特性 控制力作用机制 数值模拟 

分 类 号：TQ021.4[化学工程]