Natural convection in a triangular enclosure subject to periodic thermal forcing

Saha, S.C., Lei, C., and Patterson, J.C. (2006) Natural convection in a triangular enclosure subject to periodic thermal forcing. In: Proceedings of 13th International Heat Transfer Conference. From: 13th International Heat Transfer Conference: IHTC-13, 13-18 August 2006, Sydney, NSW, Australia.

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Abstract

The effects of periodic thermal forcing on the flow field and heat transfer through an attic space are examined numerically in this paper. We consider the case with a fixed aspect ratio of 0.5 and a fixed Grashof number of l.33 x I 06. The numerical results reveal that, during the daytime, the flow is stratified; whereas at the night-time, the flow becomes unstable. A number of regular plumes and vortices are observed in the contours of isotherms and stream functions respectively. Moreover, the flow appears to be symmetric during the daytime, and becomes asymmetric at the night-time. It is also found that the flow is weaker during the daytime than that at the night-time in the present case, and the calculated heat transfer rate at the night-time is approximately three times greater than the heat transfer rate during the daytime.

Item ID: 4284
Item Type: Conference Item (Refereed Research Paper - E1)
Keywords: natural convection; fluid dynamics; buoyancy; boundary layer
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ISBN: 1-56700-225-0
Date Deposited: 21 Oct 2009 04:46
SEO Codes: 97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 80%
96 ENVIRONMENT > 9609 Land and Water Management > 960999 Land and Water Management of Environments not elsewhere classified @ 20%
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