THREE-DIMENSIONAL COMPUTATIONAL MODELING OF MOMENTUM, HEAT, AND MASS TRANSFER IN A LASER SURFACE ALLOYING PROCESS
THREE-DIMENSIONAL COMPUTATIONAL MODELING OF MOMENTUM, HEAT, AND MASS TRANSFER IN A LASER SURFACE ALLOYING PROCESS
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DOI：
10.1080/10407780290059576
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发表时间：
2002-08
期刊：
影响因子：
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通讯作者：
S. Sarkar;P. Raj;S. Chakraborty;P. Dutta
中科院分区：
文献类型：
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作者：
S. Sarkar;P. Raj;S. Chakraborty;P. Dutta
开发了三维瞬态模型，用于研究单程激光表面合金化工艺的传热、流体流动和质量传递。使用有限体积程序求解耦合动量、能量和物质守恒方程。使用固定网格焓孔隙度技术对相变过程进行建模，该技术能够预测不断演变的固液界面。三维模型能够预测合金化过程中熔池内以及凝固合金的整个横截面中的物质浓度分布。该模型针对各种重要加工参数（例如激光功率、扫描速度和粉末进给速度）的不同值进行仿真，以评估它们对池的几何形状和动力学、冷却速率以及基底内的物质浓度分布的影响。还讨论了在数值模型中纳入属性变化的影响。
A three-dimensional, transient model is developed for studying heat transfer, fluid flow, and mass transfer for the case of a single-pass laser surface alloying process. The coupled momentum, energy, and species conservation equations are solved using a finite volume procedure. Phase change processes are modeled using a fixed-grid enthalpy-porosity technique, which is capable of predicting the continuously evolving solid-liquid interface. The three-dimensional model is able to predict the species concentration distribution inside the molten pool during alloying, as well as in the entire cross section of the solidified alloy. The model is simulated for different values of various significant processing parameters such as laser power, scanning speed, and powder feedrate in order to assess their influences on geometry and dynamics of the pool, cooling rates, as well as species concentration distribution inside the substrate. Effects of incorporating property variations in the numerical model are also discussed.