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首页> 外文期刊>Computational thermal sciences >A FIXED-GRID BASED MIXTURE MODEL FOR PULSED LASER PHASE CHANGE PROCESS
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A FIXED-GRID BASED MIXTURE MODEL FOR PULSED LASER PHASE CHANGE PROCESS

机译：脉冲激光相变过程的基于固定网格的混合模型

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摘要

A two-dimensional, transient, axisymmetric model is developed to study the transport phenomena in a laser melting problem under a single laser pulse as well as repetitive laser pulse. The model is based on one-phase continuum mixture theory and fixed-grid technique. The model incorporates natural convection in the melt pool and radiation and convection heat losses from the irradiated surface. The complicated phase front evolution is captured implicitly by calculating the liquid volume fraction based on latent heat content at each control volume. An iterative update procedure is developed to update the liquid volume fraction at each control volume. A comparative study between the effect of natural convection and diffusion on the position and shape of the solid-liquid interface is made. It is found that natural convection does not play any significant role under the present condition in deciding the width and depth of the melt pool. The melt depth and melt radius predicted using the proposed model is compared with the available results and a good agreement is found. The model is further explored to investigate the effect of natural convection on the position and shape of the molten pool under the repetitive laser pulse.
机译：建立了二维瞬态轴对称模型，以研究单个激光脉冲和重复激光脉冲下激光熔化问题中的传输现象。该模型基于一阶段连续体混合理论和固定网格技术。该模型将熔池中的自然对流以及受辐照表面的辐射和对流热损失纳入了模型。通过基于每个控制体积处的潜热含量计算液体体积分数，可以隐式捕获复杂的相前演化。开发了迭代更新程序以更新每个控制体积处的液体体积分数。比较了自然对流和扩散对固液界面位置和形状的影响。发现在确定熔池的宽度和深度时，自然对流在当前条件下不起任何作用。使用提出的模型预测的熔体深度和熔体半径与可用结果进行了比较，发现了很好的一致性。进一步探索该模型以研究自然对流在重复激光脉冲作用下对熔池位置和形状的影响。

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