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Turbulent Film Boiling on A Non-Isothermal Horizontal Elliptical Tube with Steam Heating Surface

Published online by Cambridge University Press:  05 May 2011

H.-P. Hu ,
C.-C. Wang  and
C.-K. Chen
H.-P. Hu*
Affiliation:
Department of Marine Engineering, National Taiwan Ocean University, Keelung, Taiwan 20224, R.O.C.
C.-C. Wang*
Affiliation:
Department of Mechanical and Computer-Aided Engineering, Feng chia University, Taichung, Taiwan 40724, R.O.C.
C.-K. Chen*
Affiliation:
Department of Mechanical Engineering, National Cheng Kung University, Tainan, Taiwan 70101, R.O.C.
*
* Assistant Professor, corresponding author
** Professor
** Professor
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Abstract

The present theoretical study investigates turbulent film boiling on an elliptical tube with steam heating surface inside. The flow direction of the heating steam is opposite to the vapor film of the outer tube. Thus, the surface temperature is expressed by cosine function. The effect of temperature amplitude, eccentricity, nonlinear viscosity, nonlinear thermal conductivity, radiation and eddy diffusivity are all included in the present analysis. And the paper also discusses the vapor thickness, local Nusselt number and mean Nusselt number. The result shows, first, under the free convection turbulent film boiling with temperature variation, the bigger the temperature amplitude value is, the better the heat transfer efficiency is. Next, the increase of the eccentricity values will bring out the increase of the Nusselt number. Finally, a comparison between the results of the present study and those reported in a previous theoretical data is provided.

Keywords

AmplitudeEccentricityEddy diffusivity.
Type
Articles
Information
Journal of Mechanics , Volume 26 , Issue 3 , September 2010 , pp. 287 - 292
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2010

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