Variable property effects on vertical channel natural convection in air are studied systematically. Numerical solutions of the governing equations show that both the mass flow rate and heat transfer in the channel are not only lower than the constant property results, but also show a nonmonotonic variation with increasing wall temperature or wall heat flux. This phenomenon, which seemingly conflicts with the conventional knowledge, has also been identified by experiments. For a vertical channel with a uniform heat flux boundary condition, the wall may experience a sharp rise in temperature up to damage of the channel if the wall heat flux is greater than the critical heat flux. This implies that the crisis phenomenon (or burnout) may occur in channel natural convection in gas as well as in the boiling process.
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Research Papers
Thermal Drag and Critical Heat Flux for Natural Convection of Air in Vertical Parallel Plates
Zeng-Yuan Guo,
Zeng-Yuan Guo
Department of Engineering Mechanics, Tsinghua University, Beijing 100084, People’s Republic of China
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Xiao-Bo Wu
Xiao-Bo Wu
Department of Engineering Mechanics, Tsinghua University, Beijing 100084, People’s Republic of China
Search for other works by this author on:
Zeng-Yuan Guo
Department of Engineering Mechanics, Tsinghua University, Beijing 100084, People’s Republic of China
Xiao-Bo Wu
Department of Engineering Mechanics, Tsinghua University, Beijing 100084, People’s Republic of China
J. Heat Transfer. Feb 1993, 115(1): 124-129 (6 pages)
Published Online: February 1, 1993
Article history
Received:
July 1, 1991
Revised:
April 1, 1992
Online:
May 23, 2008
Citation
Guo, Z., and Wu, X. (February 1, 1993). "Thermal Drag and Critical Heat Flux for Natural Convection of Air in Vertical Parallel Plates." ASME. J. Heat Transfer. February 1993; 115(1): 124–129. https://doi.org/10.1115/1.2910637
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