A Numerical Analysis of Free Convection Around an Isothermal Sphere (Effects of Space and Prandtl Number)
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概要
- 論文の詳細を見る
Numerical solutions of full Navier-Stokes and energy equations for two-dimensional laminar free convention between two concentric spheres are obtained for Pr=0.7〜120, Ra=1〜10^3 and radius ratios of the outer to inner sphere r_2/r_1=5〜60. With decrease of r_2/r_1, the heat transfer coefficient for the inner sphere decreases first due to suppression of convective flow and then increases due to predominance of conduction heat transfer. The heat transfer coefficient at r_2/r_1>__=60 can be regarded as that for a single sphere immersed in an infinite medium for Pr=0.7 and Ra=1. The higher the Rayleigh number, the smaller is the radius ratio at which the Nusselt number can be regarded as that for a single sphere. An accurate correlation equation for the Nusselt number is proposed. A correlation equation for the relation among drag force induced by free convection flow, Rayleigh number and Prandtl number is also presented.
- 一般社団法人日本機械学会の論文
- 1988-02-15
著者
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TAKAMATSU Hiroshi
Institute of Advanced Material Study, Kyushu University
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Fujii Tetsu
Institute Of Advanced Material Study
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FUJII Motoo
Institute of Advanced Material Study, Kyushu University
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Takamatsu Hiroshi
Institute Of Advanced Material Study
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Fujii Motoo
Institute Of Advanced Material Study
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