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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

NATURAL CONVECTIVE HEAT TRANSFER FROM TWO-SIDED HEATED HORIZONTAL ISOTHERMAL PLATES HAVING A COMPLEX SHAPE AND A FINITE THICKNESS

Get access (open in a dialog) DOI: 10.1615/IHTC16.cov.022634
pages 3025-3032

Sinopsis

Numerical and experimental studies of natural convective heat transfer from two-sided heated horizontal plates of simple shape are available. In the numerical studies it has usually been assumed that the plates have no thickness, whereas in the experimental studies plates of finite thickness have been used. To determine whether the plate thickness has a significant influence on the heat transfer rates from the surfaces of horizontal plates of various thicknesses having complex shapes results have here been numerically obtained for plates of having an I-shape and a +-shape. The upper and lower surfaces of the plates are assumed to be isothermal and at the same temperature. Both the case where the vertical side edges of the plates are isothermal and at the same temperature as the upper and lower plate surfaces, and the case where these edges are adiabatic have been considered. Conditions under which laminar, transitional, and turbulent flows exist have been considered. The standard k-epsilon turbulence model was used and was applied under all conditions. The solutions have been obtained using the commercial solver ANSYS FLUENT©. The case where the heat transfer from the plate is to air has been considered. Variations of mean Nusselt numbers for the upper and lower plate surfaces and for the entire surface of the plate with Rayleigh number for various plate thicknesses have been obtained. The results indicate that the dimensionless plate thickness has a modest effect on the heat transfer rate from the upper surface of the plates.