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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Jet impingement onto a laser produced kerf
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Jet impingement onto a laser produced kerf

机译：喷射撞击到激光产生的切缝上

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摘要

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.
机译：目的-本文的目的是研究与激光切割过程有关的射流冲击，从切缝表面传热速率和切缝壁处的皮肤摩擦。设计/方法/方法-考虑流动和传热分析的三维模型。介绍了使用控制体积法的数值方案，以求解流动和传热的控制方程。并入了k-w湍流模型以说明湍流。发现-发现在所有切缝厚度处，靠近切缝入口的区域中的努塞尔数和皮肤摩擦力仍然很高，并且朝切缝出口减小。缝隙中的流动加速还会导致Nusselt数的第二个峰值和皮肤摩擦。研究的局限性/意义-省略了切缝表面的熔化，并且将代表熔化表面的恒定温度边界纳入了分析。但是，在网格生成过程中要格外小心，以避免依赖网格的解决方案。实际意义-这些发现和讨论提供了有关实际激光切割过程的有用信息，尤其是对切口厚度对热传递和皮肤摩擦的影响的物理洞察力。创意/价值-以前没有在三维空间中进行过预测传热和皮肤摩擦的工作，这对于实际的激光切割应用很重要。因此，所报告的工作是原创的。

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