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Title: Turbulent film condensation on an isothermal sphere
Authors: Hai-ping Hu;Cha’o-Kuang Chen
Contributors: 國立臺灣海洋大學:輪機工程學系
Keywords: sphere;isothermal
Date: 2008
Issue Date: 2011-10-20T08:34:50Z
Publisher: AIAA, Journal of Thermophysics and Heat Transfer
Abstract: Abstract:This paper presents an investigation into turbulent film condensation on a sphere. It begins by considering the case of vapor flow past an isothermal sphere. The high tangential velocity of the vapor flow at the boundary layer is determined from potential flow theory. The Colburn analogy is used to define the local liquid-vapor interfacial shear which occurs for high velocity vapor flow across the spherical surface. The paper then discusses the results generated for the local dimensionless film thickness and heat transfer characteristics. Finally, the results developed in the current study are compared with those generated by previous theoretical and experimental results for laminar flow. It is found that the correlation between the two sets of data is quite satisfactory for low vapor velocity. However, at the higher vapor velocities, the rate of increase of the coefficient with velocity is greater than that associated with laminar theory. In other words, for high vapor velocity, the onset of turbulence in the condensate causes discrepancies between the two sets of data. It is noted that the results of the present study may be used to estimate the heat transfer coefficient more accurately than the result of previous laminar studies.
Relation: 19(1), pp.81-86
Appears in Collections:[Department of Marine Engineering] Periodical Articles

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