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Numerical simulation of heat transfer of turbulent impinging jets with two‐equation turbulence models

Numerical simulation of heat transfer of turbulent impinging jets with two‐equation turbulence... A numerical scheme that has already proved to be efficient and accurate for laminar heat transfer is extended for turbulent, axisymmetric heat transfer calculations. The extended scheme is applied to the steady‐state heat transfer of axisymmetric turbulent jets, impinging onto a flat plate. Firstly, the low‐Reynolds version of the standard k‐ϵ model is employed. As is well known, the classical k‐ ϵ turbulence model fails to predict the heat transfer of impinging jets adequately. A non‐linear k‐ ϵ model, with improved ϵ ‐equation, yields much better results. The numerical treatment of the higher order terms in this model is described. The effect on the heat transfer predictions of a variable turbulent Prandtl number is shown to be small. It is also verified that the energy equation can be simplified, without affecting the results. Results are presented for the flow field and the local Nusselt number profiles on the plate for impinging jets with different distances between the pipe exit and the flat plate. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Numerical Methods for Heat and Fluid Flow Emerald Publishing

Numerical simulation of heat transfer of turbulent impinging jets with two‐equation turbulence models

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References (23)

Publisher
Emerald Publishing
Copyright
Copyright © 2003 MCB UP Ltd. All rights reserved.
ISSN
0961-5539
DOI
10.1108/09615530310456787
Publisher site
See Article on Publisher Site

Abstract

A numerical scheme that has already proved to be efficient and accurate for laminar heat transfer is extended for turbulent, axisymmetric heat transfer calculations. The extended scheme is applied to the steady‐state heat transfer of axisymmetric turbulent jets, impinging onto a flat plate. Firstly, the low‐Reynolds version of the standard k‐ϵ model is employed. As is well known, the classical k‐ ϵ turbulence model fails to predict the heat transfer of impinging jets adequately. A non‐linear k‐ ϵ model, with improved ϵ ‐equation, yields much better results. The numerical treatment of the higher order terms in this model is described. The effect on the heat transfer predictions of a variable turbulent Prandtl number is shown to be small. It is also verified that the energy equation can be simplified, without affecting the results. Results are presented for the flow field and the local Nusselt number profiles on the plate for impinging jets with different distances between the pipe exit and the flat plate.

Journal

International Journal of Numerical Methods for Heat and Fluid Flow – Emerald Publishing

Published: Feb 1, 2003

Keywords: Heat transfer; Impinging jets; Numerical analysis

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