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Natural Convection Measurements for a Concentric Spherical Enclosure

[+] Author Affiliations
Peter M. Teertstra, M. Michael Yovanovich, J. Richard Culham

University of Waterloo, Waterloo, Ontario, Canada

Paper No. IMECE2002-32974, pp. 93-104; 12 pages
doi:10.1115/IMECE2002-32974
From:
  • ASME 2002 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Volume 1
  • New Orleans, Louisiana, USA, November 17–22, 2002
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-3632-0 | eISBN: 0-7918-1691-5, 0-7918-1692-3, 0-7918-1693-1
  • Copyright © 2002 by ASME

abstract

An experimental test program is described for the measurement of natural convection for an isothermal, heated sphere centrally located in an isothermal, cooled spherical enclosure. A transient test method is used in a reduced pressure environment to provide data for a wide range of Rayleigh number, from the limiting case of laminar boundary layer convection to the diffusive limit. Tests are performed using a fixed outer diameter for four different inner sphere diameters, resulting in diameter ratios in the range 1.5 ≤ do /di ≤ 4.8. The data are in excellent agreement with the exact solution for the conductive limit and are shown to be bounded by a model for the isolated, isothermal sphere.

Copyright © 2002 by ASME

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