ABSTRACT In the present study, the authors developed a new numerical model to predict the bulk fluid flow, heat transfer, hydrogen species transfer with the hydrogen bubble generation, dynamics and trapping during solidification of aluminium through the continuum theory with Lagrangian bubble dynamics. The generated bubble size is assumed to be dependent on the microstructure. The bubble drag force is newly proposed in the Euler-Lagrange framework. In a model casting system, almost all generated hydrogen bubbles are trapped into a solidified aluminium. However, the hydrogen bubbles are capable of generating in the melt phase and detaching from the mushy zone when the initial hydrogen concentration is high. In this case, the hydrogen bubbles move upward due to buoyancy and this movement is slightly affected by the surrounding melt flow.

中文翻译：

---

通过欧拉-拉格朗日框架开发铝合金凝固过程中氢气泡产生、动力学和捕获的数值模型

摘要 在本研究中，作者开发了一种新的数值模型，通过连续介质理论和拉格朗日气泡动力学来预测铝凝固过程中氢气泡产生、动力学和捕获过程中的大量流体流动、传热、氢物种传递。假定产生的气泡尺寸取决于微观结构。气泡阻力是欧拉-拉格朗日框架中新提出的。在模型铸造系统中，几乎所有产生的氢气泡都被困在凝固的铝中。然而，当初始氢浓度高时，氢气泡能够在熔融相中产生并从糊状区分离。在这种情况下，氢气泡由于浮力而向上移动，并且这种移动受到周围熔体流动的轻微影响。