矩形微通道中气-非牛顿流体两相流实验研究  

Experimental Study on Gas-non-Newtonian Two-phase Flow in Rectangular Microchannels

作　　者：李清玉 王贵超[1,2] 刘竞婷 陈颂英 LI Qingyu;WANG Guichao;LIU Jingting;CHEN Songying(School of Mechanical Engineering,Shandong University,Jinan 250061,China;Key Laboratory of High Efficient and Clean Machinery Manufacturing,Ministry of Education,Shandong University,Jinan 250061,China)

机构地区：[1]山东大学机械工程学院,济南250061 [2]山东大学高效清洁机械制造教育部重点实验室,济南250061

出　　处：《工程热物理学报》2023年第5期1253-1263,共11页Journal of Engineering Thermophysics

基　　金：国家自然科学基金-山东联合基金项目(No.U2006221);国家自然科学青年基金项目(No.52006126)。

摘　　要：本文通过实验研究了空气与非牛顿流体在小尺寸矩形微通道中的两相流动特性,给出了在不同气液两相流速下的流型图。同时比较了气液两相流速,液相黏度,表面张力,微通道尺寸对各流型分布区域以及Taylor气泡/液柱长度的影响。发现气液两相流流速变化对流型区域的影响极为明显,而黏性力和表面张力只是在局部范围改变了流型分布。Taylor气泡长度随气液两相流速比增大而增大,随液相黏度及表面张力增大而减小。液柱长度随液相黏度增大而增大,随两相流速比及表面张力增大而减小。最后,我们给出了基于无量纲数JG/JL,Re和Ca的Taylor气泡/液柱长度预测公式,公式预测结果与实验结果基本一致。In this paper,the two-phase flow characteristics of air and non-Newtonian fluids in small-sized rectangular microchannels are experimentally studied,and the flow patterns at different gas-liquid two-phase flow rates are given.The effects of gas-liquid two-phase flow rate,liquid viscosity,surface tension,and microchannel size on the distribution area of each flow pattern and the length of Taylor bubble/liquid slug are compared.It is found that the change of gas-liquid two-phase flow velocity has a very obvious effect on the flow pattern region,while the viscous force and surface tension only change the flow pattern distribution in a local range.The Taylor bubble length increases with the increase of the gas-liquid two-phase flow rate ratio,and decreases with the increase of the liquid phase viscosity and surface tension.The length of the liquid slug increases with the increase of the liquid viscosity,and decreases with the increase of the two-phase flow rate ratio and the surface tension.Finally,we give the Taylor bubble/liquid slug length prediction formula based on the dimensionless numbers JG/JL,Re and Ca,and the prediction results of the formula are basically consistent with the experimental results.

关 键 词：气液两相流 Taylor流 流型图 矩形微通道 

分 类 号：TK123[动力工程及工程热物理—工程热物理]