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首页> 外文期刊>Journal of Heat Transfer >Influences of Sign of Surface Tension Coefficient on Turbulent Weld Pool Convection in a Gas Tungsten Arc Welding (GTAW) Process: A Comparative Study
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Influences of Sign of Surface Tension Coefficient on Turbulent Weld Pool Convection in a Gas Tungsten Arc Welding (GTAW) Process: A Comparative Study

机译：钨极氩弧焊过程中表面张力系数的符号对湍流熔池对流的影响：比较研究

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摘要

The effects of positive and negative surface tension coefficients ({partial deriv}σ{sub}(sur)/ {partial deriv}T) on both laminar and turbulent weld pool convection are numerically studied for a typical gas tungsten arc welding (GTAW) process. Three-dimensional turbulent weld pool convection in a pool is simulated using a suitably modified high Reynolds number k-ε model in order to account for the morphology of an evolving solid-liquid interface. Key effects of the sign of surface tension coefficient ({partial deriv}σ{sub}(sur) /{partial deriv}T) on the turbulent transport in a GTAW process are highlighted by comparing the turbulent simulation results with the corresponding ones from a laminar model, keeping all other process parameters unaltered. A scaling analysis is also performed in order to obtain order-of-magnitude estimates of weld pool penetration for both positive and negative surface tension coefficients. The scaling analysis predictions are in good agreement with the numerical results, in an order-of-magnitude sense.
机译：对于典型的钨极氩弧焊（GTAW）工艺，数值研究了正负表面张力系数（{偏导}σ{sub}（sur）/ {偏导} T）对层流和湍流焊池对流的影响。为了解决不断变化的固液界面形态，使用适当修改的高雷诺数k-ε模型对熔池中的三维湍流熔池对流进行了模拟。通过将湍流模拟结果与来自ATA的相应湍流模拟结果进行比较，重点说明了表面张力系数（{partial deriv}σ{sub}（sur）/ {partial deriv} T）的符号对GTAW过程中湍流输运的关键影响。层流模型，保持所有其他过程参数不变。为了获得正负表面张力系数的焊池熔深的数量级估计，还执行了定标分析。尺度分析预测与数值结果在数量级上非常吻合。

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