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Title: Pool boiling heat transfer of water on finned surfaces at near vacuum pressures
Authors: Chan, M.A.
Yap, C.R. 
Ng, K.C. 
Keywords: Boiling
Boiling enhancement
Bubble visualization
Electronic cooling
Extended surfaces
Subatmospheric pressure
Issue Date: Mar-2010
Citation: Chan, M.A., Yap, C.R., Ng, K.C. (2010-03). Pool boiling heat transfer of water on finned surfaces at near vacuum pressures. Journal of Heat Transfer 132 (3) : 1-6. ScholarBank@NUS Repository.
Abstract: This research paper presents a study of boiling heat transfer from longitudinal rectangular-finned surfaces immersed in saturated water at low vapor pressures. Finned surfaces with assorted fin spacing, fin thicknesses, and fin heights on a copper based surface have been investigated. All the finned surfaces were found to increase both boiling heat transfer coefficients and critical heat fluxes. An optimal fin thickness was found for a configuration, and heat transfer coefficients have been obtained at the pressures. Factors affecting the boiling characteristics have been identified and the optimal enhancement requires a balance of the active nucleation sites, bubble flow resistance, natural convection, thin film evaporation, liquid superheating, heat transfer area, bubble coalescence, and liquid reflux resistance. High speed visualization of vapor plug and vapor film generation on the boiling surfaces has revealed significant insights into the boiling mechanisms at low saturation pressures. © 2010 by ASME.
Source Title: Journal of Heat Transfer
ISSN: 00221481
DOI: 10.1115/1.4000054
Appears in Collections:Staff Publications

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