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Simultaneous Spreading and Solidification of an Impacting Molten Droplet With Substrate Remelting

机译：熔融熔滴与基材重熔同时扩散和固化

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摘要

The nonisothermal phase-change behavior of droplet deposition on a substrate has been studied. The governing equation for the flow field is solved using a finite-volume scheme with a two-step projection method on a fixed computational grid. The volume-of-fluid (VOF) method is used to track the free surface, and the continuum surface force (CSF) method is used to model the surface tension. An enthalpy formulation with a porosity model is adopted for solving the energy equation. A comparison with published experimental findings has been done to validate the numerical model. The effects of convection terms in the energy equation are examined, and droplet spreading and solidification along with substrate remelting have been analyzed. A parametric study relating the effects of substrate preheating and impact velocity on remelting, cooling rate, spreading, and solidification has also been carried out. It has been observed that the flow field within the droplet has a significant effect on the overall deposition process.
机译：已经研究了液滴在基板上的非等温相变行为。在有限的计算网格上使用有限体积方案和两步投影方法求解流场的控制方程。流体体积（VOF）方法用于跟踪自由表面，连续表面力（CSF）方法用于模拟表面张力。采用具有孔隙率模型的焓公式来求解能量方程。与已发布的实验结果进行了比较，以验证数值模型。检查了能量方程中对流项的影响，并分析了液滴扩散和固化以及基材重熔。还进行了有关基材预热和冲击速度对重熔，冷却速率，铺展和固化的影响的参数研究。已经观察到，液滴内的流场对整个沉积过程具有显着影响。

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  • 来源
    《Journal of Heat Transfer》 |2017年第3期|59-69|共11页
  • 作者

    Vimal Ramanuj; Albert Y. Tong;

  • 作者单位

    Department of Mechanical and Aerospace Engineering, University of Texas at Arlington, Arlington, TX 76019;

    Department of Mechanical and Aerospace Engineering, University of Texas at Arlington, Arlington, TX 76019;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
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