矩形微通道内气液两相流型及其转换边界的实验研究  

Gas-Liquid Two-Phase Flow Patterns and Boundaries in a Rectangular Microchannel

作　　者：刘谦[1] 张颂红[1] 沈绍传[1] 贠军贤[1] 姚克俭[1] 徐林红[2,3] 

机构地区：[1]浙江工业大学化学工程与材料学院绿色合成技术国家重点实验室培育基地,浙江杭州310032 [2]浙江大学流体动力与机电系统国家重点实验室,浙江杭州310027 [3]中国地质大学(武汉)机械与电子信息学院,湖北武汉430074

出　　处：《高校化学工程学报》2011年第6期916-922,共7页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金资助项目(20606031;21036005);流体动力与机电系统国家重点实验室开放基金项目(GZKF-201010)

摘　　要：气液两相流流型预测是微流动系统设计和控制的基础。实验在带有＂十＂字形和＂T＂字形的矩形微通道（主通道水力直径0.29 mm）内,以氮气作为气相,分别以乙醇-表面活性剂水溶液或丙酮-表面活性剂水溶液为互溶混合液相,对气液两相流型及转换边界进行了研究。气相表观速度和混合液相表观速度分别在0.012-22.391 m·s-1和0.006-1.508 m·s-1,利用可视化研究方法,观察到泡状流、弹状流、扰动流及分层流四种流型,并绘制出流型图,将所得流型图与文献中的流型转变边界线作了比较。利用文献中流型转变关联式预测实验条件下流型边界,发现其对弹状流向扰动流转变的预测较为符合,并通过韦伯准数修正关联式得出本实验中弹状流向扰动流转变的流型边界。The prediction of gas-liquid two-phase flow patterns is fundamental for the design and process control of microfluidic systems.In this work,the flow patterns and boundaries of nitrogen gas and two miscible liquids（the aqueous surfactant solution and ethanol or acetone） in a rectangular microchannel（hydraulic diameter Dh=0.29 mm） with cross and T-shaped junctions were studied experimentally.Different flow patterns such as bubble flow,slug flow,churn flow and stratified flow,were observed by a visualization method at gas superficial velocities ranged from 0.012 to 22.391 m·s-1 and the miscible liquids superficial velocities from 0.006 to 1.508 m·s-1.The depicted flow pattern maps were compared with the flow boundaries reported in the literatures.The obtained experimental values of flow pattern transitions were compared with the predictions given by the correlation reported in the literatures.A modified correlation was obtained by considering Weber number,which is available in the prediction of the transition from slug flow to churn flow under the present experimental conditions.

关 键 词：矩形微通道 两相流 流型 流型图 流型边界 

分 类 号：O363.2[理学—流体力学]