期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 93, 期 -, 页码 554-565出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2015.09.031
关键词
Pool boiling heat transfer; Wettability; Interface dynamics; Surface heterogeneity; Surface modification
资金
- National Research Foundation of Korea (NRF) grant - Korea government (MSIP) [NRF-2013M2A8A1040987]
- National Research Foundation of Korea [2013M2A8A1040987] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Single bubble dynamics of distilled water were experimentally investigated on hydrophobic-hydrophilic mixed surfaces with hydrophobic dot diameters ranging from 50 mu m to 6 mm. The heterogeneity of surface wettability could affect interfacial dynamics and cause the pinning phenomenon of the bubble interface, a contact angle transition, a 'stick-slip' behavior, and the interface necking during bubble growth. The triple line of a bubble initiated from a hydrophobic dot was pinned at its edge where a singularity of the surface wettability occurs. During this contact line pinning, the contact angle of bubble interface decreased. When the contact angle decreased to equal the receding contact angle of a bare hydrophilic surface, the triple line moved outward rapidly; this is called 'slip' behavior. After such process, the nucleated bubble vertically elongated and subsequently departed from the surface. The contact angle transition during the pinning and departing behavior was described by considering the capillary length of the bubble determined by the vertical deformation of bubbles. Using the bubble dynamics on the heterogeneously patterned surface with compactly arranged 50 mu m dots, boiling heat transfer coefficient enhanced to 2.1 times that in the bare hydrophilic surface. (C) 2015 Elsevier Ltd. All rights reserved.
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