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Heat Transfer Research
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ISSN Druckformat: 1064-2285
ISSN Online: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.v41.i3.70
pages 299-311

Experiments on Natural Convection Heat Transfer from an Isothermal Plate on a Semi-Infinite Surface and from a Constrained Horizontal Plate in Air

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

ABSTRAKT

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 ranging 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 by the equation Nu = 0.458 Ra0.271. These results are higher in comparison with the data obtained for an isothermal horizontal plate on a semi-infinite surface by about 15 to 18% in a laminar region and 12 to 11% in a turbulent region. The aspect ratio of the rectangular plate was Y/W = 2.548.


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