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NATURAL CONVECTION HEAT TRANSFER FROM CONSTRAINED HORIZONTAL PLATE

DOI: 10.1615/ICHMT.2009.CONV.510
12 pages

Czeslaw Oleskowicz-Popiel
Institute of Environmental Engineering, Poznan University of Technology, 60 965 Poznan, Poland

Janusz Wojtkowiak
Poznan University of Technology, Institute of Environmental Engineering, 60965 Poznan, Piotrowo 3A, Poland

Résumé

Measurements were performed to determine the average natural convection heat transfer characteristics for an isothermal, upward-facing horizontal constrained rectangular plate, i.e. surrounded (fenced) by vertical adiabatic walls. Results revealed that for the Rayleigh number ranged from Ra = 1.8×106 to 1.5×107 and relative height of the walls in the range from about H/W = 0.25 to 1.0 the average Nusselt number is described with the equation Nu=0.458 Ra0.271. These results are higher in comparison with the data obtained for an isothermal horizontal plate in semi-infinite surface by about 15 to 18% in laminar region and 12 to 11 % in turbulent region. The aspect ratio of the rectangular plate was Y/W=2.548.

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