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.
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Research Papers
Pool Boiling Heat Transfer of Water on Finned Surfaces at Near Vacuum Pressures
Mark Aaron Chan,
Mark Aaron Chan
Department of Mechanical Engineering,
National University of Singapore
, 10 Kent Ridge Crescent, Singapore 119260
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Christopher R. Yap,
Christopher R. Yap
Department of Mechanical Engineering,
National University of Singapore
, 10 Kent Ridge Crescent, Singapore 119260
Search for other works by this author on:
Kim Choon Ng
Kim Choon Ng
Department of Mechanical Engineering,
e-mail: mpengkc@nus.edu.sg
National University of Singapore
, 10 Kent Ridge Crescent, Singapore 119260
Search for other works by this author on:
Mark Aaron Chan
Department of Mechanical Engineering,
National University of Singapore
, 10 Kent Ridge Crescent, Singapore 119260
Christopher R. Yap
Department of Mechanical Engineering,
National University of Singapore
, 10 Kent Ridge Crescent, Singapore 119260
Kim Choon Ng
Department of Mechanical Engineering,
National University of Singapore
, 10 Kent Ridge Crescent, Singapore 119260e-mail: mpengkc@nus.edu.sg
J. Heat Transfer. Mar 2010, 132(3): 031501 (6 pages)
Published Online: December 29, 2009
Article history
Received:
March 23, 2009
Revised:
August 17, 2009
Online:
December 29, 2009
Published:
December 29, 2009
Citation
Chan, M. A., Yap, C. R., and Ng, K. C. (December 29, 2009). "Pool Boiling Heat Transfer of Water on Finned Surfaces at Near Vacuum Pressures." ASME. J. Heat Transfer. March 2010; 132(3): 031501. https://doi.org/10.1115/1.4000054
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