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Natural Convection Over Bodies in the Transition Zone Between Laminar Thin Boundary Layer Dominated and Conduction Dominated Natural Convection

[+] Author Affiliations
Arnout Willockx, Christophe Tjoen, Hendrik-Jan Steeman, Michel De Paepe

Ghent University, Gent, Belgium

Paper No. HT2005-72702, pp. 645-652; 8 pages
doi:10.1115/HT2005-72702
From:
  • ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems
  • Heat Transfer: Volume 1
  • San Francisco, California, USA, July 17–22, 2005
  • Conference Sponsors: Heat Transfer Division and Electronic and Photonic Packaging Division
  • ISBN: 0-7918-4731-4 | eISBN: 0-7918-3762-9
  • Copyright © 2005 by ASME

abstract

Different Rayleigh (Ra)-Nusselt (Nu)-correlations exist for natural convection from bodies. Different characteristic lengths are used by different authors. This paper reports of an experiment in which Ra is varied in an intermediate range. It is an interesting range because the values lie in a transition zone between laminar thin boundary layer dominated and conduction dominated natural convection. The experimental data is compared with existing correlations to check the accuracy and validity of these correlations for this transitional range of Ra. A new correlation that is only valid in this transitional zone is also proposed.

Copyright © 2005 by ASME

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