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Journal of EngineeringVolume 2013 2013, Article ID 320647, 9 pages

Research ArticleDepartment of Energy Science and Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India

Received 10 November 2012; Accepted 4 February 2013

Academic Editor: Mo Yang

Copyright © 2013 M. Prakash. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The natural convection heat losses occurring from cubical open cavities are analysed in this paper. Open cubical cavities of sides 0.1 m, 0.2 m, 0.25 m, 0.5 m, and 1 m with constant temperature back wall boundary conditions and opening ratio of 1 are studied. The Fluent CFD software is used to analyse the three-dimensional 3D cavity models. The studies are carried out for cavities with back wall temperatures between 35°C and 100°C. The effect of cavity inclination on the convective loss is analysed for angles of 0° cavity facing sideways, 30°, 45°, 60°, and 90° cavity facing vertically downwards. The Rayleigh numbers involved in this study range between 4.5 × 10

and 1.5 × 10

. The natural convection loss is found to increase with an increase in back wall temperature. The natural convection loss is observed to decrease with an increase in cavity inclination; the highest convective loss being at 0° and the lowest at 90° inclination. This is observed for all cavities analysed here. Nusselt number correlations involving the effect of Rayleigh number and the cavity inclination angle have been developed from the current studies. These correlations can be used for engineering applications such as electronic cooling, low- and medium-temperature solar thermal systems, passive architecture, and also refrigeration systems.





Autor: M. Prakash

Fuente: https://www.hindawi.com/



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