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An experimental and theoretical study of natural convection in the annulus between horizontal concentric cylinders

Published online by Cambridge University Press:  29 March 2006

T. H. Kuehn  and
R. J. Goldstein
T. H. Kuehn
Affiliation:
Department of Mechanical Engineering, University of Minnesota. Minneapolis
R. J. Goldstein
Affiliation:
Department of Mechanical Engineering, University of Minnesota. Minneapolis
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Abstract

An experimental and theoretical-numerical investigation has been carried out to extend existing knowledge of velocity and temperature distributions and local heat-transfer coefficients for naturel convection within a horizontal annulus. A Mach—Zehnder interferometer was used to determine temperature distributions and local heat-transfer coefficients experimentally. Results were obtained using water and air at atmospheric pressure with a ratio of gap width to inner-cylinder diameter of 0·8. The Rayleigh number based on the gap width varied from 2·11 × 104to 9·76 × 105. A finite-difference method was used to solve the governing constant-property equations numerically. The Rayleigh number was changed from 102 to 105 with the influence of Prandtl number and diameter ratio obtained near a Rayleigh number of 104. Comparisons between the present experimental and numerical results under similar conditions show good agreement.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 74 , Issue 4 , 22 April 1976 , pp. 695 - 719
Copyright
© 1976 Cambridge University Press

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