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ISSN 打印: 1064-2285
ISSN 在线: 2162-6561

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DOI: 10.1615/HeatTransRes.2016010722
pages 391-399

NATURAL CONVECTION IN A RECTANGULAR ENCLOSURE WITH AN ARRAY OF DISCRETE HEAT SOURCES

S. Saravanan
UGC-DRS Center for Fluid Dynamics, Department of Mathematics, Bharathiar University, Coimbatore 641 046, Tamil Nadu, India
V. P. M. Senthil Nayaki
Department of Mathematics, Bharathiar University, Coimbatore 641 046, Tamil Nadu, India
P. Kandaswamy
Department of Mathematics, Bharathiar University, Coimbatore 641 046, Tamil Nadu, India

ABSTRACT

A study of natural convection from a 3 × 3 array of isoflux discrete heat sources mounted on one of the vertical walls in a three-dimensional rectangular enclosure is made. Two different boundary conditions are considered, one in which the two side walls are cooled and the other in which the top and bottom walls are cooled. Numerical solutions are obtained using a finite volume method. Flow and heat transfer characteristics are investigated as a function of Rayleigh number (Ra), aspect ratio (A), and Prandtl number (Pr). The results show that the heat transfer rate increases with Ra. It also increases against A in the range 1-3, however, attains a maximum at around A = 3 and decreases beyond that. The entire enclosure above the bottom heaters is found to be more thermally active when the top and bottom walls are kept cold. However, an effective cooling is possible only in the case of side cold walls.


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