Numerical investigation on a simulation model of floating zone convection
Numerical investigation on a simulation model of floating zone convection
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DOI：
10.1016/0017-9310(96)00153-6
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发表时间：
1997-03
影响因子：
5.2
通讯作者：
Q. S. Chen;W. Hu
中科院分区：
文献类型：
--
作者：
Q. S. Chen;W. Hu
本文对上杆绝热、下杆恒温的模拟模型进行了数值研究。由于在微重力环境中，浮满区的温度分布在中间平面上是对称的，因此，与通常的两棒恒温浮满区模型相比，模拟模型中的温度分布更接近浮满区的半部分。模拟结果表明，该模型的温度分布和流动模式不同于通常的浮动半区模型。最近的实验提出了另一种半区模型，即上杆温度分布不均匀，下杆温度恒定。上杆的温度边界条件在中心有一个最大值，在自由表面附近有一个低值。本文还对改进后的仿真模型进行了数值模拟。
A simulation model with adiabatic condition at the upper rod and constant temperature at the lower rod is studied numerically in this paper. The temperature distribution in a simulation model is closer to the one in the half part of a floating full zone in comparison with the one in a usual floating half zone model with constant temperature at both rods, because the temperature distribution of a floating full zone is symmetric for the middle plane in a microgravity environment. The results of the simulation model show that the temperature profiles and the flow patterns are different from those of the usual floating half zone model. Another type of half zone model, with a special non-uniform temperature distribution at the upper rod and constant temperature at the lower rod, has been suggested by recent experiments. The temperature boundary condition of the upper rod has a maximum value in the center and a lower value near the free surface. This modified simulation model is also simulated numerically in the present paper.