北京航空航天大学学报 ›› 2008, Vol. 34 ›› Issue (12): 1398-1401.

• 论文 • 上一篇    下一篇

求解等温相变问题的解耦法

吴 斌, 邢玉明   

  1. 北京航空航天大学 航空科学与工程学院, 北京 100191
  • 收稿日期:2008-01-03 出版日期:2008-12-31 发布日期:2010-09-16
  • 作者简介:吴 斌(1983-),男,江西永丰人,博士生,wb_buaa@126.com.

Decoupling method for solving isothermal phase change problem

Wu Bin, Xing Yuming   

  1. School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
  • Received:2008-01-03 Online:2008-12-31 Published:2010-09-16

摘要: 基于焓法模型导出了一种求解等温相变问题的简单计算模型.计算模型将温度场与液相分数场进行解耦,即可分别求解出相变控制体和非相变控制体的温度;以长方体容器为例,用计算模型进行计算并将计算结果与实验数据及焓法计算结果进行对比验证,结果吻合的很好;利用计算模型,对长方体容器和圆柱体容器内相变材料熔化时间进行数值计算比较.结果表明,在容器体积和特征尺寸相同的条件下,长方体容器内相变材料的熔化时间几乎只有圆柱体容器的一半.

Abstract: A simple computational model for isothermal phase change problem was based on the enthalpy formulation. The temperature field and liquid fraction field were decoupled of the computational model to solve the temperature of the control volume separately which was melting/freezing or not. The computational model was verified with a test problem of a rectangular container. The agreement of the computation results with the experimental data indicates this method could be used to estimate the model-s isothermal phase change quickly and effectively. The numerical analysis of the melting time of phase change material for rectangular and cylindrical containers was then performed using the computational model. The results show that the phase change material of rectangular container requires nearly half of the melting time as for the cylindrical container of the same volume and characteristic size.

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