Enhancement of vapor condensation heat transfer on the micro- and nano-structured superhydrophobic surfaces

doi:10.1016/j.ijheatmasstransfer.2021.121526

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	Enhancement of vapor condensation heat transfer on the micro- and nano-structured superhydrophobic surfaces
	Wang, Xin 5; Xu, Bo 5; Liu QS(刘秋生)2; Yang, Yang 1; Chen, Zhenqian 3,4,5
刊名	INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
	2021-10-01
卷号	177 页码:13
关键词	Condensation heat transfer Micropillar arrays Lattice Boltzmann method Droplet dynamics ESEM
ISSN号	0017-9310
DOI	10.1016/j.ijheatmasstransfer.2021.121526
通讯作者	Xu, Bo(xubo@seu.edu.cn) ; Chen, Zhenqian(zqchen@seu.edu.cn)
英文摘要	Recently, micro- or nano- structured surfaces haven been developed to enhance condensation heat transfer, water harvesting and self-cleaning. However, at large subcoolings, condensate floods the subcooled substrate, thus deteriorating the heat transfer efficiency. Here, the superhydrophobic surfaces with micropillared and nanopillared structures are proposed to enhance heat transfer at large subcoolings. The influence of micropillar spacing and surface subcooling on the droplet dynamics and heat transfer performance is experimentally investigated using microscopic visualization techniques. In addition, the microscopic modeling of condensation heat transfer on the microstructured surfaces is performed using the mesoscopic lattice Boltzmann method. The results demonstrate that the droplet size distribution on the micropillared surface is significantly smaller over that of the nanostructured surface. The heat transfer coefficient decreases with the increase of micropillar spacing. As the subcooling rises, although the condensate floods the substrate, the heat transfer coefficient of the S10R30 (S10R30 represents the micropillar arrays with s = 10 mu m and 2r = 60 mu m) surface is enhanced by 26.4% compared to the hydrophobic nanostructured surface. This is because the height of liquid film is the same of order of magnitude as the micropillars, reducing the thermal resistance caused by the liquid layer. Combining environmental scanning electron microscope (ESEM) observations and LB simulation results, it is concluded that the droplets first nucleate at the bottom corner of micropillars. In addition, the condensate droplets merge to form a film, fill the micropillar gaps, and cover the entire micropillars, leading to a sharp decrease in heat flux. These findings provide a theoretical and experimental guidance for the development of condensing surfaces to enhance heat transfer. (C) 2021 Elsevier Ltd. All rights reserved.
分类号	一类
资助项目	National Natural Science Foundation of China[52006031] ; ESA-CMSA International Cooperation of Space Experiment Project (Study on Condensation and Enhancement Methods under Microgravity) ; Scientific Research Foundation of Graduate School of Southeast University[YBPY1949]
WOS关键词	LATTICE BOLTZMANN SIMULATION ; DROPWISE CONDENSATION ; FILMWISE CONDENSATION ; WATER ; WETTABILITY ; TRANSITION ; NUCLEATION ; EFFICIENCY ; DROPLETS ; BEETLE
WOS研究方向	Thermodynamics ; Engineering ; Mechanics
语种	英语
WOS记录号	WOS:000670753600003
资助机构	National Natural Science Foundation of China ; ESA-CMSA International Cooperation of Space Experiment Project (Study on Condensation and Enhancement Methods under Microgravity) ; Scientific Research Foundation of Graduate School of Southeast University
其他责任者	Xu, Bo ; Chen, Zhenqian
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/87155]
专题	中国科学院力学研究所
作者单位	1.Chinese Acad Sci, Engn & Technol Ctr Space Applicat, Beijing, Peoples R China 2.Chinese Acad Sci, Inst Mech, Key Lab Micrograv, Beijing, Peoples R China; 3.Southeast Univ, Sch Energy & Environm, Jiangsu Prov Key Lab Solar Energy Sci & Technol, Nanjing, Peoples R China; 4.Southeast Univ, Sch Energy & Environm, Minist Educ, Key Lab Energy Thermal Convers & Control, Nanjing, Peoples R China; 5.Southeast Univ, Sch Energy & Environm, Nanjing, Peoples R China;
推荐引用方式 GB/T 7714	Wang, Xin,Xu, Bo,Liu QS,et al. Enhancement of vapor condensation heat transfer on the micro- and nano-structured superhydrophobic surfaces[J]. INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,2021,177:13.
APA	Wang, Xin,Xu, Bo,刘秋生,Yang, Yang,&Chen, Zhenqian.(2021).Enhancement of vapor condensation heat transfer on the micro- and nano-structured superhydrophobic surfaces.INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,177,13.
MLA	Wang, Xin,et al."Enhancement of vapor condensation heat transfer on the micro- and nano-structured superhydrophobic surfaces".INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 177(2021):13.