Turbulent natural convection in a vertical two-dimensional square cavity, isothermally heated from below and cooled at the upper surface, is numerically analyzed using the finite volume method. The enclosure has a thin horizontal porous obstruction, made of a highly porous material and extremely permeable, located at the cavity midheight. Governing equations are written in terms of primitive variables and are recast into a general form. For empty cavities, no discrepancies result for the Nusselt number when laminar and turbulent model solutions are compared for Rayleigh numbers up to . Also, in general the porous obstruction decreases the heat transfer across the heated walls showing overall lower Nusselt numbers when compared with those without the porous obstruction. However, the presence of a porous plate in the cavity seems to force an earlier separation from laminar to turbulence model solutions due to higher generation rates of turbulent kinetic energy into the porous matrix.
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November 2006
This article was originally published in
Journal of Heat Transfer
Research Papers
Turbulent Heat Transfer in an Enclosure With a Horizontal Permeable Plate in the Middle
Edimilson J. Braga,
Edimilson J. Braga
Departamento de Energia—IEME,
Instituto Tecnológico de Aeronáutica—ITA
, 12228-900, São José dos Campos, SP, Brazil
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Marcelo J. S. de Lemos
Marcelo J. S. de Lemos
Mem. ASME
Departamento de Energia—IEME,
e-mail: delemos@ita.br
Instituto Tecnológico de Aeronáutica—ITA
, 12228-900, São José dos Campos, SP, Brazil
Search for other works by this author on:
Edimilson J. Braga
Departamento de Energia—IEME,
Instituto Tecnológico de Aeronáutica—ITA
, 12228-900, São José dos Campos, SP, Brazil
Marcelo J. S. de Lemos
Mem. ASME
Departamento de Energia—IEME,
Instituto Tecnológico de Aeronáutica—ITA
, 12228-900, São José dos Campos, SP, Brazile-mail: delemos@ita.br
J. Heat Transfer. Nov 2006, 128(11): 1122-1129 (8 pages)
Published Online: April 5, 2006
Article history
Received:
April 15, 2005
Revised:
April 5, 2006
Citation
Braga, E. J., and de Lemos, M. J. S. (April 5, 2006). "Turbulent Heat Transfer in an Enclosure With a Horizontal Permeable Plate in the Middle." ASME. J. Heat Transfer. November 2006; 128(11): 1122–1129. https://doi.org/10.1115/1.2352779
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