Natural Convection Heat Transfer Through Inclined Longitudinal Slots

[+] Author and Article Information
J. G. Symons, M. K. Peck

Division of Energy Technology, Commonwealth Scientific and Industrial Research Organization, Highett, Victoria, Australia

J. Heat Transfer 106(4), 824-829 (Nov 01, 1984) (6 pages) doi:10.1115/1.3246758 History: Received June 22, 1983; Online October 20, 2009


The convective rates of heat transfer through inclined longitudinal slots is studied for the case where heat is transferred from a lower heated isothermal surface, through the slots, to an upper cooled isothermal surface. Experimental data are given for longitudinal slots having aspect ratios from 6–12, slot heights of 25–60 mm, inclinations from horizontal to vertical, and Ra < 107 . Data are also given for a transverse slot of aspect ratio 6, for inclinations from horizontal to vertical, and Ra < 107 . It is shown that convective heat transfer rates are essentially independent of slot orientation for inclinations up to 15 deg from the horizontal, but longitudinal slots are more effective in suppressing natural convection than transverse slots with the same aspect ratio, for inclinations from 24 to 75 deg from the horizontal. The difference in heat transfer rates for longitudinal and transverse slots inclined between 24 and 75 deg from the horizontal are shown to be due to different convective flows occurring in each slot. The heat flow measurements are supported by convective flow visualization experiments which demonstrate the modes of convective flow within slots.

Copyright © 1984 by ASME
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