Characterizing the temperature profile near contact lines of an evaporating sessile drop

被引：0
|
作者：
Huang C. [1 ]
Tang H. [1 ]
Gu T. [1 ]
Zhao Y. [1 ,2 ]
机构：
[1] Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai
[2] Key Laboratory of Icing and Anti/De-icing, China Aerodynamics Research and Development Center, Mianyang
来源：
Huagong Xuebao/CIESC Journal | 2021年 / 72卷 / 10期
关键词：
Convection; Cooling ring; Evaporation; Fluorescence drop; Heat transfer; Temperature measurement;
D O I：
10.11949/0438-1157.20210498
中图分类号：
学科分类号：
摘要：
Exploring the kinetic principle of static droplet evaporation plays an important role in many related industrial applications. Despite that this phenomenon has been extensively studied over recent decades, an unsolved problem is that how exactly the temperature changes in the adjacent of contact lines. We report in this work a direct experimental measurement revealing the temperature profile of the free interface near contact lines of a sessile drop during the evaporation stage with pinned contact lines. We adapted a microscopic fluorescence-based thermometry, and found that the temperature at the free interface changes drastically near contact lines, forming a concentric fringe pattern which evolves over the whole evaporation process. We attribute the formation of such fringe pattern to a combined mechanism comprising of locally enhanced evaporative cooling near drop edges and a set of thermobuoyancy-driven convective rolls. The new fundamental understanding provided in this work reveals insights into the evaporation dynamics, promising advances in various applications of heat transfer systems. © 2021, Editorial Board of CIESC Journal. All right reserved.
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页码：5142 / 5149
页数：7
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