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ISSN Druckformat: 1064-2285
ISSN Online: 2162-6561
Indexed in
Experiments on Natural Convection Heat Transfer from an Isothermal Plate on a Semi-Infinite Surface and from a Constrained Horizontal Plate in Air
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.