On the oscillatory behavior of transient Rayleigh Benard convection of air for 2D channel flow at moderate Rayleigh numbers

Sojoudi, A., Vakilimoghaddam, F., Neishabouri, R., & Saha, Suvash C. (2012) On the oscillatory behavior of transient Rayleigh Benard convection of air for 2D channel flow at moderate Rayleigh numbers. In Ao, S.I., Gelman, L., Hukins, D.W.L., Hunter, A., & Korsunsky, A. M. (Eds.) Proceedings of the World Congress on Engineering 2012 Vol III, Newswood Limited, London, U.K., pp. 1874-1878.

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Unsteady numerical simulation of Rayleigh Benard convection heat transfer from a 2D channel is performed. The oscillatory behavior is attributed to recirculation of ascending and descending flows towards the core of the channel producing organized rolled motions. Variation of the parameters such as Reynolds number, channel outlet flow area and inclination of the channel are considered. Increasing Reynolds number (for a fixed Rayleigh number), delays the generation of vortices. The reduction in the outflow area leads to the later and the less vortex generation. As the time progresses, more vortices are generated, but the reinforced mean velocity does not let the eddies to enter the core of the channel. Therefore, they attach to the wall and reduce the heat transfer area. The inclination of the channel (both positive and negative) induces the generated vortices to get closer to each other and make an enlarged vortex.

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ID Code: 52890
Item Type: Conference Paper
Refereed: Yes
Additional URLs:
Keywords: Numerical solution, Unsteady Rayleigh Benard convection, 2D channel flow, Vortex generation
ISBN: 9789881925220
ISSN: 2078-0966
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MECHANICAL ENGINEERING (091300) > Numerical Modelling and Mechanical Characterisation (091307)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2012
Deposited On: 02 Aug 2012 05:23
Last Modified: 16 Aug 2012 12:55

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