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首页> 外文期刊>International Journal of Heat and Mass Transfer >Modelling of turbulent molten pool convection in laser welding of a copper-nickel dissimilar couple
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Modelling of turbulent molten pool convection in laser welding of a copper-nickel dissimilar couple

机译：铜镍异种材料对激光焊接中湍流熔池对流的建模

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摘要

The effects of turbulence on momentum, heat, and mass transfer during laser welding of a copper-nickel dissimilar couple are studied by carrying out three-dimensional unsteady Reynolds Averaged Navier Stokes (RANS) simulations. The turbulent transport is modelled by a suitably modified high Reynolds number k-ε model. The solid-liquid phase change is accounted for by a modified enthalpy porosity technique. In order to demonstrate the effects of turbulence, two sets of simulations are carried out for the same set of processing parameters: one with the turbulence model, and the other without activating the turbulence model. The enhanced diffusive transport associated with turbulence is shown to decrease the maximum values of temperature, velocity magnitude, and copper mass fraction in the molten pool. The effects of turbulence are found to be most prominent on the species transport in the molten pool. The composition distribution in turbulent simulation is found to be more uniform than that obtained in the simulation without turbulent transport. The nickel composition distribution predictions, as obtained from the present turbulence model based simulations, are also found to be in good agreement with the corresponding experimental results.
机译：通过进行三维非稳态雷诺平均纳维斯托克斯（RANS）模拟，研究了湍流对铜镍异种夫妇激光焊接过程中动量，热量和质量传递的影响。湍流传输通过适当修改的高雷诺数k-ε模型进行建模。固-液相变化是通过改进的焓孔隙率技术解决的。为了证明湍流的影响，针对同一组处理参数进行了两组仿真：一组具有湍流模型，另一组没有激活湍流模型。与湍流相关的增强的扩散传输显示出降低了熔池中温度，速度大小和铜质量分数的最大值。发现湍流的影响在熔池中的物质传输上最为明显。发现在湍流模拟中的成分分布比在没有湍流输运的模拟中获得的成分分布更均匀。从当前基于湍流模型的模拟获得的镍成分分布预测也与相应的实验结果非常吻合。

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