Abstract
This article reports a numerical analysis of combined natural convection and non-gray gas radiation within a cylindrical enclosure, isothermally heated and cooled on various arc lengths of the sidewall. Three active zone locations are studied in this article. The first heating section extends quarter the perimeter of the cavity, the second spreads across one-half of the cylinder, and the third one is made of three-quarters of the sidewall. The participating media are considered as emissive, absorbent, and non-scattering. The radiative transfer equation is resolved using the Ray-Tracing method associated to the Statistical Narrow Band–correlated K model. The effect of heater size and its location on heat transfer, fluid flow, and entropy generation are presented and discussed in this work. The results show that the optimum heater size is obtained for three-quarters heated enclosure. It was also found that choosing a heat source centered at the top of the enclosure provides the best heat transfer performance.
Highlights
The second law of thermodynamic has attracted great attention for many researchers due to its interesting role in different industrial applications such as electronic cooling, storage thermal systems, heat exchangers, and nuclear reactors
This creates temperature gradients in the vicinities of the cold surface, generating volumetric entropy due to conduction heat transfer and justifying its remarkable presence in the vicinity of the cold surface and in the discontinuities signaled at the extremities of the heat source
A numerical computation of coupling between natural convection and radiation in a partially heated cylindrical enclosure filled with a non-gray gas is investigated
Summary
The second law of thermodynamic has attracted great attention for many researchers due to its interesting role in different industrial applications such as electronic cooling, storage thermal systems, heat exchangers, and nuclear reactors. X ð X4 h i wikin InbðT ðr, fÞÞ À Ini r, f, O~ dODn bands O i = 1 The profiles of local radiative Nusselt number along the sidewall and local entropy generation due to surface radiation are given in Figure 3(i) and (j), respectively.
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