高校化学工程学报2016，Vol.30Issue(2)：318-324,7.DOI:10.3969/j.issn.1003-9015.2016.00.001
基于可视化观测和红外测温技术的微通道中乙醇蒸发气液相界面特性研究
Research on Interfacial Characteristics of Ethanol Evaporation in Single Microchannels Using Visualization and Infrared Thermography
摘要
Abstract
The characteristics of evaporating meniscus formed in single microchannels were experimentally investigated and heat transfer process during evaporation was analyzed. Microchannels with hydraulic diameters of 571, 762 and 1454μm (with aspect ratio of 20, 20, and 10, respectively) were used. The evaporation rate and the evaporation rate per unit length of the contact line in different channels were obtained. The temporal channel surface temperature profiles were measured. The heat sink effect at the meniscus was captured, and its variation along the meniscus was examined. Moreover, the impacts of microchannel cross sectional geometry on evaporation were discussed and preliminary conclusions on evaporation heat transfer were obtained. The results show that the meniscus stability largely depends on evaporation rate, which increases with the applied heat flux. Larger microchannels are also found to promote evaporation as the evaporation process mostly happens at the contact line. Moreover, the evaporation rate per unit length of the contact line increases when the microchannel aspect ratio decreases.关键词
微通道/蒸发弯液面/传热/热沉效应Key words
mirochannel/meniscus/heat transfer/heat sink effect分类
数理科学引用本文复制引用
汪元,王振国..基于可视化观测和红外测温技术的微通道中乙醇蒸发气液相界面特性研究[J].高校化学工程学报,2016,30(2):318-324,7.基金项目
国家自然科学基金项目(11302255)。 （11302255）
