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Computational study of heat transfer in a conjugate turbulent wall jet flow with constant heat flux

Article Information:

Title:

Computational study of heat transfer in a conjugate turbulent wall jet flow with constant heat flux

Author(s):

E. Vishnuvardhanarao, Manab Kumar Das

Journal:

International Journal of Numerical Methods for Heat & Fluid Flow

Year:

2009

Volume:

19

Issue:

1

Page:

39 - 52


ISSN:

0961-5539


DOI:

10.1108/09615530910922143

Publisher:

Emerald Group Publishing Limited

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Abstract:

Purpose – The purpose of this paper is to consider the conjugate heat transfer from a flat plate involving a turbulent plane wall jet. The bottom wall of the solid block is heated by a constant heat flux.

Design/methodology/approach – High Reynolds number two-equation model (?-) has been used for turbulence modeling. The parameters considered are the conductivity ratio of solid and fluid, the solid slab thickness and the Prandtl number. The Reynolds number considered is 15,000 because the flow becomes fully turbulent and then is independent of the Reynolds number. The range of parameters considered are: conductivity ratio?=?1-1,000, solid slab thickness?=?1-10 and Prandtl number?=?0.01-100.

Findings – The non-dimensional bottom surface temperature is high for high-Prandtl number fluid and vice versa. As conductivity ratio increases, it decreases whereas it increases with the increase in slab thickness. Similar trend is observed for the distribution of the interface temperature. The Nusselt number computed based on the interface temperature increases with Prandtl number. It is observed that for the range of parameters considered, local Nusselt number distribution superimposes with each other. The average heat flux at the interface has been computed and found to be equal with average heat flux at the bottom which ensures the overall heat balance.

Originality/value – The study of conjugate heat transfer with a turbulent wall jet will be useful for cooling of heated body.

Keywords:

Flow, Heat transfer, Simulation, Turbulence


Article Type:

Research paper


Article URL:

http://www.emeraldinsight.com/10.1108/09615530910922143

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