Investigación

 

Natural convection and surface thermal radiation in a tilted open shallow cavity

 

J.F. Hinojosa Palafox

 

University of Sonora, Hermosillo, Sonora, México, Blvd. Rosales y Luis Encinas s/n, 83000, e–mail: fhinojosa@iq.uson.mx

 

Recibido el 19 de septiembre de 2011.
Aceptado el 2 de diciembre de 2011.

 

Abstract

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.

Keywords: Shallow open cavity; natural convection; thermal radiation.

 

PACS: 44.25.+f; 44.40.+a

 

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