A three-dimensional model of droplet impact and solidification
A three-dimensional model of droplet impact and solidification
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DOI：
10.1016/s0017-9310(01)00336-2
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发表时间：
2002-05
影响因子：
5.2
通讯作者：
M. Pasandideh-Fard;S. Chandra;J. Mostaghimi
中科院分区：
文献类型：
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作者：
M. Pasandideh-Fard;S. Chandra;J. Mostaghimi
本文建立了一个三维模型，模拟了熔融金属液滴福尔斯在平板上下落时的流体动力学、传热和相变过程。该模型是Bussmann等人[Phys. Fluids 11（1999）1406]开发的模型的扩展，并将流体流动和能量方程的固定网格控制体积离散化与体积跟踪算法相结合，以跟踪液滴自由表面，并改进固定速度方法以跟踪凝固前沿。表面张力被建模为作用在自由表面附近的流体上的体积力。接触角被用作液-固接触线处的边界条件。液滴的液体和固体部分的能量方程使用焓方法求解。基板内的热传递仅通过传导。在液滴-基底界面处的接触热阻被包括在模型中。我们研究了锡液滴在不锈钢表面的沉积，采用实验和数值模拟。给出了两种不同情况下的结果：2.7 mm锡液滴以1 m/s的速度垂直撞击，以及2.2 mm锡液滴以2.35 m/s的速度倾斜撞击到与水平面成45°的表面上。从数值模型获得的图像与实验照片进行了比较，发现吻合良好。
A three-dimensional model has been developed to simulate the fluid dynamics, heat transfer and phase-change that occur when a molten metal droplet falls onto a flat substrate. The model is an extension of one developed by Bussmann et al. [Phys. Fluids 11 (1999) 1406] and combines a fixed-grid control volume discretization of the fluid flow and energy equations with a volume-tracking algorithm to track the droplet free surface, and an improved fixed velocity method to track the solidification front. Surface tension is modeled as a volume force acting on fluid near the free surface. Contact angles are applied as a boundary condition at liquid–solid contact lines. The energy equations in both the liquid and solid portions of the droplet are solved using the Enthalpy method. Heat transfer within the substrate is by conduction alone. Thermal contact resistance at the droplet–substrate interface is included in the model. We studied the deposition of tin droplets on a stainless steel surface using both experiments and numerical simulations. The results of two different scenarios are presented: the normal impact of a 2.7 mm tin droplet at 1 m/s, and of the oblique impact of a 2.2 mm tin droplet at 2.35 m/s onto a surface inclined at 45° to the horizontal. Images obtained from numerical model were compared with experimental photographs and found to agree well.