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Experimental study of high-rayleigh-number convection in a horizontal cavity with different end temperatures

Publication ,  Journal Article
Bejan, A; Al-Homoud, AA
Published in: Journal of Fluid Mechanics
January 1, 1981

The paper summarizes results from an experimental study of buoyancy-induced motion and heat transfer in a horizontal rectangular cavity with the two vertical ends at different temperatures and the long horizontal walls adiabatic. The cavity height/ length ratio is A = 0.0625. The high-Rayleigh-number range reported on in this paper, 2 × 108 < Ra < 2 × 109, has not been studied before. It is shown that, contrary to lower-Rayleigh-number behaviour known previously, the core flow structure is nonparallel and is dominated by horizontal intrusions flowing along each of the two insulated horizontal walls of the enclosure. The fluid embraced by the two horizontal jets is practically stagnant and thermally stratified. Flow visualization experiments suggest that adjacent to the two horizontal jets two secondary flat cells are formed by the baroclinic pressure field in an analogous way to what is observed in intrusions in a stratified fluid. Nusselt-number-Rayleigh-number results for the overall end-to-end heat transfer in the horizontal direction are reported and compared with previous experimental and theoretical results available for lower Rayleigh numbers. It is shown also that the transition from a parallel core structure to one dominated by intrusion layers is governed by the parameter Ra‡ A, with Ra‡ A < 1 as necessary condition for a parallel core flow. © 1981, Cambridge University Press. All rights reserved.

Duke Scholars

Published In

Journal of Fluid Mechanics

DOI

EISSN

1469-7645

ISSN

0022-1120

Publication Date

January 1, 1981

Volume

109

Start / End Page

283 / 299

Related Subject Headings

  • Fluids & Plasmas
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 01 Mathematical Sciences
 

Citation

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Bejan, A., & Al-Homoud, A. A. (1981). Experimental study of high-rayleigh-number convection in a horizontal cavity with different end temperatures. Journal of Fluid Mechanics, 109, 283–299. https://doi.org/10.1017/S0022112081001079
Bejan, A., and A. A. Al-Homoud. “Experimental study of high-rayleigh-number convection in a horizontal cavity with different end temperatures.” Journal of Fluid Mechanics 109 (January 1, 1981): 283–99. https://doi.org/10.1017/S0022112081001079.
Bejan A, Al-Homoud AA. Experimental study of high-rayleigh-number convection in a horizontal cavity with different end temperatures. Journal of Fluid Mechanics. 1981 Jan 1;109:283–99.
Bejan, A., and A. A. Al-Homoud. “Experimental study of high-rayleigh-number convection in a horizontal cavity with different end temperatures.” Journal of Fluid Mechanics, vol. 109, Jan. 1981, pp. 283–99. Scopus, doi:10.1017/S0022112081001079.
Bejan A, Al-Homoud AA. Experimental study of high-rayleigh-number convection in a horizontal cavity with different end temperatures. Journal of Fluid Mechanics. 1981 Jan 1;109:283–299.
Journal cover image

Published In

Journal of Fluid Mechanics

DOI

EISSN

1469-7645

ISSN

0022-1120

Publication Date

January 1, 1981

Volume

109

Start / End Page

283 / 299

Related Subject Headings

  • Fluids & Plasmas
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 01 Mathematical Sciences