Evaporation Process of Sessile Liquid Droplet and Layer in Steady State

doi:10.1007/s12217-022-09993-w

	Evaporation Process of Sessile Liquid Droplet and Layer in Steady State
	Liu QS(刘秋生)1,2; Liu, Wenjun 1; Li ZL(李子龙)1,2; Tao YQ(陶跃群)2; Chen X(陈雪)2; Zhu ZQ(朱志强)2
刊名	MICROGRAVITY SCIENCE AND TECHNOLOGY
	2022-07-26
卷号	34 期号:4 页码:10
关键词	Evaporation Liquid droplet Liquid layer Steady state Thermal flow pattern Heat flux
ISSN号	0938-0108
DOI	10.1007/s12217-022-09993-w
通讯作者	Liu, Qiusheng(liu@imech.ac.cn)
英文摘要	The ethanol liquid droplet with constant contour and liquid layer with constant height in steady-state contained in the heated substrate under evaporation have been experimentally investigated utilizing infrared thermography and volume control technique. The heat and mass transfer and thermal flow patterns at the gas-liquid interface during droplet and layer evaporation are analyzed through their heat flux curves and interface temperature fields. Experimental results reveal that the steady-state evaporation of liquid droplet and layer at surface emerges after the evaporation rate is equal to replenishment rate by continuous liquid refilling and temperature filed becomes uniform. For evaporating droplets, there are two main stages during the evaporation evolution: unstable evaporation with decreasing heat flux and steady evaporation with constant heat flux. In the steady stage, the interface temperature gradually becomes uniform, and convection cells at the interface disappear. For evaporating layer, three main stages are present: first, the formation and splitting of Marangoni convection cells, then the hydrothermal wave propagating from "source" to "sink", and finally the stable flow stage without vortex cells. The results also show that the direction of the temperature gradient at evaporating droplet interface is opposite under different substrate materials (Aluminum and PTFE). The heat flux density of the evaporating droplet on Aluminum substrate is larger than that on PTFE, resulting in a higher evaporation rate. These new findings help to gain a better understanding of the coupling mechanism between phase change and thermal convection inside evaporating liquid droplets and layers.
分类号	二类
资助项目	National Natural Science Foundation of China[11532015] ; National Natural Science Foundation of China[11302236] ; Strategic Priority Research Program on Space Science, Chinese Academy of Sciences[XDA04073000] ; Strategic Priority Research Program on Space Science, Chinese Academy of Sciences[XDA04020202-02] ; China Manned Space Program[TZ-1]
WOS关键词	HYDROTHERMAL WAVES ; SURFACE ; INSTABILITIES ; CONVECTION
WOS研究方向	Engineering ; Thermodynamics ; Mechanics
语种	英语
WOS记录号	WOS:000830707400001
资助机构	National Natural Science Foundation of China ; Strategic Priority Research Program on Space Science, Chinese Academy of Sciences ; China Manned Space Program
其他责任者	Liu, Qiusheng
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/89806]
专题	力学研究所_国家微重力实验室
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China;
推荐引用方式 GB/T 7714	Liu QS,Liu, Wenjun,Li ZL,et al. Evaporation Process of Sessile Liquid Droplet and Layer in Steady State[J]. MICROGRAVITY SCIENCE AND TECHNOLOGY,2022,34(4):10.
APA	刘秋生,Liu, Wenjun,李子龙,陶跃群,陈雪,&朱志强.(2022).Evaporation Process of Sessile Liquid Droplet and Layer in Steady State.MICROGRAVITY SCIENCE AND TECHNOLOGY,34(4),10.
MLA	刘秋生,et al."Evaporation Process of Sessile Liquid Droplet and Layer in Steady State".MICROGRAVITY SCIENCE AND TECHNOLOGY 34.4(2022):10.