NUMERICAL ANALYSIS OF FREE CONVECTION AROUND AN ISOTHERMAL SPHERE (EFFECTS OF SPACE AND PRANDTL NUMBER).

M. Fujii, Hiroshi Takamatsu, T. Fujii

研究成果: 著書/レポートタイプへの貢献会議での発言

13 引用 (Scopus)

抄録

Numerical solutions of full Navier-Stokes and energy equations for two dimensional laminar free convection between two concentric spheres are obtained for Pr equals 0. 7 to approximately 120, Ra equals 1 to approximately 10**3 and radius ratios of the outer to inner sphere r//2/r//1 equals 5 to approximately 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 transfer. The heat transfer coefficient at r//2/r//1 greater than equivalent to 60 can be regarded as that for a single sphere immersed in an infinite medium for Pr equals 0. 7 and Ra equals 1. The higher the Rayleigh number, the smaller is the radius ratio at which 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 forces induced by free convection flow, Rayleigh number and Prandtl number is also presented.

元の言語英語
ホスト出版物のタイトルUnknown Host Publication Title
出版者ASME
ページ55-60
ページ数6
4
出版物ステータス出版済み - 1987

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Prandtl number
Natural convection
Numerical analysis
Nusselt number
Heat transfer coefficients
Drag

All Science Journal Classification (ASJC) codes

  • Engineering(all)

これを引用

Fujii, M., Takamatsu, H., & Fujii, T. (1987). NUMERICAL ANALYSIS OF FREE CONVECTION AROUND AN ISOTHERMAL SPHERE (EFFECTS OF SPACE AND PRANDTL NUMBER).Unknown Host Publication Title (巻 4, pp. 55-60). ASME.

NUMERICAL ANALYSIS OF FREE CONVECTION AROUND AN ISOTHERMAL SPHERE (EFFECTS OF SPACE AND PRANDTL NUMBER). / Fujii, M.; Takamatsu, Hiroshi; Fujii, T.

Unknown Host Publication Title. 巻 4 ASME, 1987. p. 55-60.

研究成果: 著書/レポートタイプへの貢献会議での発言

Fujii, M, Takamatsu, H & Fujii, T 1987, NUMERICAL ANALYSIS OF FREE CONVECTION AROUND AN ISOTHERMAL SPHERE (EFFECTS OF SPACE AND PRANDTL NUMBER).Unknown Host Publication Title. 巻. 4, ASME, pp. 55-60.
Fujii M, Takamatsu H, Fujii T. NUMERICAL ANALYSIS OF FREE CONVECTION AROUND AN ISOTHERMAL SPHERE (EFFECTS OF SPACE AND PRANDTL NUMBER). : Unknown Host Publication Title. 巻 4. ASME. 1987. p. 55-60
Fujii, M. ; Takamatsu, Hiroshi ; Fujii, T. / NUMERICAL ANALYSIS OF FREE CONVECTION AROUND AN ISOTHERMAL SPHERE (EFFECTS OF SPACE AND PRANDTL NUMBER). Unknown Host Publication Title. 巻 4 ASME, 1987. pp. 55-60
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