Resumo

HINOJOSA PALAFOX, J.F.. Natural convection and surface thermal radiation in a tilted open shallow cavity. Rev. mex. fis. [online]. 2012, vol.58, n.1, pp.19-28. ISSN 0035-001X.

In this paper the numerical calculations of heat transfer by natural convection and surface radiation in a tilted open shallow cavity are presented. The cavity maintains the opposite wall to the aperture at a constant temperature while the remaining walls are adiabatic. The results in the steady state are obtained for a Rayleigh number range from 10⁵ to 10⁷, inclination angles from 45° to 135° and aspect ratios equal to 2 and 4. It was found that the exchange of thermal radiation between walls is considerably more relevant that the convective phenomenon for an inclination angle of 135°. Oscillations in the convective Nusselt number were observed for inclination angles of 45° (AR=4) and 90° (AR of 2 and 4) caused by the formation of thermal plumes in the bottom adiabatic wall that travel and mix with the thermal layer of the hot wall.

Palavras-chave : Shallow open cavity; natural convection; thermal radiation.