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Computations of structures formed by the solidification of impinging molten metal drops

机译：由撞击的熔融金属滴凝固形成的结构的计算

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Solidification of multiple molten metal drops impacting a cold wall is simulated numerically in axi-symmetric coordinates. The numerical method fully couples fluid flow and heat transfer and is based on a single set of conservation equations written for all phases. Solidification of the melt is modeled by simply assuming that the material freezes when the temperature falls below the prescribed freezing point. Since the shape of each drop depends on the Weber number, Peclet number, and nondimensional superheat, various structures can be built with precise control of these parameters. The deposition of low Weber number drops produce tall, slender towers, while high Weber number drops make short, squat towers. Numerical results also show that sufficiently high cooling rates generally result in final splat diameters independent of Weber number as the drops are not given time to fully deform before solidification. Voids or indentation may develop within the tower of solid drops when the cooling rates are lower than that required for full ex-tensional deformation of the deposited liquid drop, and this phenomenon is characterised by a porosity factor.
机译：在轴对称坐标中数值模拟了影响冷壁的多个熔融金属滴的凝固。数值方法将流体流动和传热完全耦合，并且基于针对所有阶段编写的一组守恒方程。通过简单地假设当温度降至规定的凝固点以下时材料冻结，可以模拟熔体的凝固。由于每个液滴的形状取决于韦伯数，佩克利数和无量纲过热，因此可以通过精确控制这些参数来构建各种结构。低韦伯数滴的沉积产生高而细长的塔，而高韦伯数滴的沉积使得矮而矮的塔。数值结果还表明，足够高的冷却速率通常会导致最终的飞溅直径与Weber数无关，因为在凝固前没有给液滴足够的时间使其完全变形。当冷却速率低于沉积液滴的完全拉伸变形所需的冷却速率时，在固体液滴的塔内可能会形成空隙或凹陷，这种现象的特征在于孔隙率。

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