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Proceedings of the 24th National and 2nd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2017)

ISSN: 2688-7231 (Online)

EFFECTS OF NON-UNIFORM HEATING ON NATURAL CONVECTION WITHIN RHOMBIC ENCLOSURES: A NUMERICAL STUDY

Shantanu Dutta
Department of Mechanical Engineering National Institute of Technology Durgapur

Arup Kumar Biswas
Department of Mechanical Engineering National Institute of Technology Durgapur

Sukumar Pati
Department of Mechanical Engineering National Institute of Technology Silchar

DOI: 10.1615/IHMTC-2017.1850
pages 1339-1347

Abstract

In this paper, we numerically investigate the heat transfer and entropy generation characteristics for a two-dimensional steady and laminar natural convection in an air-filled (Pr = 0.71) rhombic enclosure. The side walls are maintained at cold temperature and the hot top and bottom walls have varying non-uniform temperature distributions with different phases. The fluid flow and heat transfer characteristics are systematically investigated for Rayleigh number in the range of 103 to 106, for different phase deviation angle and amplitude parameter related to the non-uniform temperature profile of the top and bottom walls. Results are presented in terms of streamlines, isotherms, local Nusselt number, average Nusselt number, and distribution of entropy generation due to fluid friction and heat transfer.

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