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首页> 外文会议>International conference on computational and experimental methods in multiphase and complex flow >Modeling of micrometre-sized molten metallic droplet impact on a solid wall
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Modeling of micrometre-sized molten metallic droplet impact on a solid wall

机译：微米尺寸的熔融金属液滴对固体壁的冲击建模

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Thermal spray coatings have been widely applied to enhance the appearance, adhesion, wear, oxidation, and corrosion resistance of materials in various industrial applications. Coatings form by the impact and spreading of high velocity molten coating droplets (splats) on a substrate. Coating buildup occurs as subsequent droplets overlap. A fundamental understanding of the complex interaction between a droplet and solid substrate can help to predict and improve the splat spreading process and thus the quality of coatings at a larger scale. In this study, a three dimensional model has been developed to simulate the impact, spreading and solidifying process of a micrometre-sized molten nickel droplet on a smooth stainless steel surface. The model is based on computational fluid dynamics (CFD), and combines a multiphase Eulerian fixed-grid model with a volume of fluid method (VOF) to track the droplet free surface. The effects of thermal contact resistance and contact angle on droplet shape were investigated. We demonstrate that high values of thermal contact resistance or contact angles can induce droplet breakup. The numerical results will provide new insights into the interpretation of empirical results as well as enhance the physical understanding of the fluid mechanism that leads to splashing.
机译：热喷涂涂料已被广泛应用于在各种工业应用中增强材料的外观，附着力，耐磨性，抗氧化性和耐腐蚀性。涂层是由高速熔融涂层液滴（碎片）在基材上的撞击和散布形成的。随着随后的液滴重叠，出现涂层堆积。对液滴与固体基材之间复杂的相互作用的基本了解可以帮助预测和改善飞溅扩散过程，从而有助于更大范围的涂层质量。在这项研究中，已经开发了三维模型来模拟微米级大小的熔融镍滴在光滑的不锈钢表面上的冲击，扩散和凝固过程。该模型基于计算流体动力学（CFD），并将多相欧拉固定网格模型与一定体积的流体方法（VOF）相结合，以跟踪无液滴的表面。研究了热接触电阻和接触角对液滴形状的影响。我们证明了高的热接触电阻或接触角值会引起液滴破裂。数值结果将为解释经验结果提供新的见解，并增强对导致飞溅的流体机理的物理理解。

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