Effect of width and temperature of a vertical parallel plate channel on the transition of the developing thermal boundary layer

Alzwayi, A.S. and Paul, M.C. (2013) Effect of width and temperature of a vertical parallel plate channel on the transition of the developing thermal boundary layer. International Journal of Heat and Mass Transfer, 63, pp. 20-30. (doi:10.1016/j.ijheatmasstransfer.2013.03.056)

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Abstract

Numerical simulations are performed to study the transition of the development of the thermal boundary layer of air along an isothermal heated plate in a large channel which is bounded by an adiabatic plate. In particular, the aim is to investigate the effects of the channel width (b) on the transition of the flow under various plate temperatures. Three different RANS based turbulent k–ε models namely standard, RNG and Realizable with an enhanced wall function are employed in the simulations. The channel width was varied from 0.04 m to 0.45 m and the numerical results of the maximum values of the flow velocity, turbulent kinetic energy were recorded along the vertical axis to examine the critical distance of the developing flow. The results show that the transition delays when the width is increased from 0.04 m to 0.08 m and particularly, the critical distance at b = 0.08 m reaches its maximum with the Grashof number of 2.8 × 1010. However, the critical distance drops when b is increased further from 0.08 m to 0.45 m, indicating an early transition of the flow. The transition remains unaffected by the adiabatic plate when b is greater than 0.45 m. Comparisons of selected numerical results are made with available experimental data of turbulent flow and a satisfied agreement is received.

Item Type:Articles
Additional Information:NOTICE: this is the author’s version of a work that was accepted for publication in International Journal of Heat and Mass Transfer. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Heat and Mass Transfer, 63, 2013. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2013.03.056.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Paul, Dr Manosh
Authors: Alzwayi, A.S., and Paul, M.C.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:International Journal of Heat and Mass Transfer
Publisher:Elsevier
ISSN:0017-9310
Copyright Holders:Copyright © 2013 Elsevier Ltd.
First Published:First published in International Journal of Heat and Mass Transfer 63:20-30
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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