Natural convection in a triangular enclosure subject to periodic thermal forcing

Saha, Suvash C., Lei, Chengwang, & Patterson, John C. (2006) Natural convection in a triangular enclosure subject to periodic thermal forcing. In Proceedings of 13th International Heat Transfer Conference, Begell House Inc, Sydney Convention & Exhibition Centre, Sydney, NSW.

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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 1.33×106. 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.

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ID Code: 44164
Item Type: Conference Paper
Refereed: Yes
Keywords: Natural convection, Triangular enclosure, Periodic thermal forcing, Attic space
DOI: 10.1615/IHTC13.p6.430
ISBN: 1567002250
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MECHANICAL ENGINEERING (091300) > Numerical Modelling and Mechanical Characterisation (091307)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Engineering Systems
Copyright Owner: Copyright 2006 Begell House Inc
Deposited On: 23 Aug 2011 22:23
Last Modified: 12 Jun 2013 14:10

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