微流控系统表面张力和黏度在线测量  

Microfluidics Measurement of Surface Tensions and Viscosities for Two-Phase Flow

作　　者：孙彦红[1,2] 郭朝红 姜玉雁[1] 郭聪[1] 王涛[1] 唐大伟[1] SUN Yan-Hong;GUO Chao-Hong;JIANG Yu-Yan;GUO Cong;WANG Tao;TANG Da-Wei(Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China;University of Chinese Academy of Sciences, Beijing 100049, China)

机构地区：[1]中国科学院工程热物理研究所,北京100190 [2]中国科学院大学,北京100049

出　　处：《工程热物理学报》2018年第6期1311-1315,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51376179;No.51476167)

摘　　要：微流控系统中界面流体界面张力和黏性作用力对传热、压降以及临界热流密度(CHF)起主导作用,由于流体物性在两相流系统中对环境参数非常敏感,因此对微流控系统界面张力和黏度的在线测量非常重要。本文提出了表面张力和黏度快速在线测量的新方法.该方法基于Taylor流在微通道中的流体动力学,通过液膜厚度的测量及其与流体物性间的理论关系式,对冷却工质FC-72及乙醇和水液体混合物的的动态表面张力和黏度进行了计算,并与文献参考值和理论模型做了比较,证实该方法可以得到可靠的表面张力和黏度结果。该方法具有样品耗量小、动态及在线测量优点,实现了微通道两相流动和物性测量的结合。Two-phase heat transfer, pressure drop and critical heat flux（CHF） are believed to be dependent on the surface tension-in conjunction with the forces due to viscous shear. The critical physical properties are sensitive to environment parameter changes during two phase low and evaporation. Therefore, it is important to carry out the online experiment on the surface tension and viscosity measurement in microfluidic systems. This paper presents a novel and fast analytical tool for surface tension and viscosity measurement at the microsale. Based on the hydrodynamics of Taylor flow and the theoretical relationship between liquid film thickness and the critical physical properties,we carried out the surface tension and viscosity for refrigerant FC-72 as well as the liquid mixture of water/ethanol. This investigation indicated that the proposed method is capable of accurately and simply measuring both surface tension and viscosity at the microscale. It offers opportunities for online investigations in quality control and manufacturing where rapid and repeated measurements need to be made with small volume consumption.

关 键 词：微通道 表面张力 黏度 Taylor流 

分 类 号：TK124[动力工程及工程热物理—工程热物理]