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Jet impingement onto a laser produced kerf: Influence of kerf thickness on heat transfer and skin friction

Omar A. Melhem (ME Department, KFUPM, Dhahran, Saudi Arabia)
Bekir S. Yilbas (ME Department, KFUPM, Dhahran, Saudi Arabia)
S.Z. Shuja (ME Department, KFUPM, Dhahran, Saudi Arabia)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 9 August 2011

Abstract

Purpose

The purpose of this paper is to investigate the heat transfer rates from the kerf surfaces and skin friction at the kerf wall due to the jet impingement in relation to laser cutting process.

Design/methodology/approach

Three‐dimensional modeling for the flow and heat transfer analysis is considered. The numerical scheme using the control volume approach is introduced to solve the governing equations of flow and heat transfer. The k‐w turbulence model is incorporated to account for the turbulence.

Findings

It is found that the Nusselt number and the skin friction remains high in the region next to the kerf inlet and it decreases towards the kerf exit for all kerf thicknesses considered. The flow acceleration in the kerf also results in the second peak of the Nusselt number and the skin friction.

Research limitations/implications

The melting at the kerf surface was omitted and the constant temperature boundary representing the melt surface is incorporated in the analysis. However, care was taken during the mesh generation to avoid grid dependent solutions.

Practical implications

The findings and discussions provide the useful information on the practical laser cutting process, in particular, physical insight into the effect of the kerf thickness on the heat transfer and skin friction.

Originality/value

No previous work has been carried out in three‐dimensional space to predict the heat transfer and skin friction, which are important for practical laser cutting applications. Therefore, the work reported is original.

Keywords

Citation

Melhem, O.A., Yilbas, B.S. and Shuja, S.Z. (2011), "Jet impingement onto a laser produced kerf: Influence of kerf thickness on heat transfer and skin friction", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 21 No. 6, pp. 754-778. https://doi.org/10.1108/09615531111148491

Publisher

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Emerald Group Publishing Limited

Copyright © 2011, Emerald Group Publishing Limited