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Heat Transfer and Friction Characteristics Optimization with Compound Turbulators in Roughened Ducts

Published online by Cambridge University Press:  05 May 2011

R. Kamali  and
A. R. Binesh
R. Kamali*
Affiliation:
Department of Mechanical Engineering, Shiraz University, Zand Street, School of Engineering, Shiraz, Iran, 71348–51154
A. R. Binesh*
Affiliation:
Department of Mechanical Engineering, Shiraz University, Zand Street, School of Engineering, Shiraz, Iran, 71348–51154
*
* Assistant Professor
** Master of Science
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Abstract

The use of artificial roughness or turbulence promoters on a surface is an effective technique to enhance the rate of heat transfer of the fluid flowing in a duct. In this study, a computer code has been developed to perform a numerical simulation for optimizing the shape of two-dimensional channel with periodic ribs mounted on the bottom wall to enhance turbulent heat transfer. The Reynolds-Averaged Navier-Stokes analysis is used as a numerical technique and the SST k-(ω) turbulent model with near-wall treatment as a turbulent model. The simulations were performed for two rib shapes, trapezoidal with decreasing height in the flow direction with and without grooves between the ribs. The results are validated by comparing with existing experimental data and semi-empirical correlations. The Reynolds number, pitch-to-rib high ratio and relative groove position are chosen as design variables. The effects of roughness parameters on Nusselt number and friction factor have been discussed and the conditions for the best performance have been determined and presented.

Keywords

Heat transfer enhancementRoughened ductsCFDRANS equations
Type
Articles
Information
Journal of Mechanics , Volume 25 , Issue 3 , September 2009 , pp. 271 - 278
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2009

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