Decoupling method for solving isothermal phase change problem
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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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Key words:
- enthalpy formulation /
- isothermal phase change /
- decouple /
- melting
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