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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Numerical simulation of solidification of liquid copper saturated in porous structures fabricated by sintered steel particles
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Numerical simulation of solidification of liquid copper saturated in porous structures fabricated by sintered steel particles

机译：烧结钢颗粒在多孔结构中饱和液态铜凝固的数值模拟

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Purpose - The purpose of this paper is to solve solidification of liquid copper saturated in porous structure fabricated by sintered steel particles using a temperature-transforming model (TTM). Design/methodology/approach - The convection in the liquid region is modeled using Navier-Stokes equation with Darcy's term and Forchheimer's extension. The effect of natural convection is considered using the Boussinesq approximation. For the solid region, the velocity is set to zero by the Ramped Switch-Off Method (RSOM). The model was validated by comparing the results with existing experimental and numerical results with gallium as phase change material and packed glass beads as porous structure. Solidification of liquid copper saturated in sintered copper particles is then simulated and the effects of various parameters on solidification process were studied. Findings - The results indicate that the stronger convection effects are shown for the cases with high Raleigh number or high Darcy's number. However, when either Raleigh number or Darcy's number is reduced to below a certain order of magnitude, the solidification becomes conduction-controlled. Originality/value - This work is the first application of the TTM to solve solidification in porous media, which can find its application in post-processing of laser sintered parts.
机译：目的-本文的目的是使用温度转换模型（TTM）解决由烧结钢颗粒制成的多孔结构中饱和的液态铜的固化。设计/方法/方法-使用带有Darcy项和Forchheimer扩展的Navier-Stokes方程对液体区域中的对流建模。使用Boussinesq逼近来考虑自然对流的影响。对于实心区域，通过“斜坡关闭”方法（RSOM）将速度设置为零。通过将结果与现有实验结果和数值结果进行比较，以镓为相变材料，以填充玻璃珠为多孔结构，对模型进行了验证。然后模拟了烧结铜颗粒中饱和的液态铜的凝固过程，研究了各种参数对凝固过程的影响。结果-结果表明，对于具有高罗利数或高达西数的情况，显示出更强的对流效果。但是，当将罗利数或达西数减小到一定数量级以下时，凝固就成为传导控制的。原创性/价值-这项工作是TTM首次用于解决多孔介质中的凝固问题，可以在激光烧结零件的后处理中找到其应用。

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