中国空间科学技术

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自然对流对相变材料熔化过程的影响分析

管鲁京;张加迅;李劲东;   

  1. 中国空间技术研究院;
  • 发布日期:2009-04-25

Analysis on the Influence of Natural Convection during Melting of Phase Change Material

Jian Lujing Zhang Jiaxun Li Jindong (China Academy of Space Technology,Beijing 100094)   

  • Online:2009-04-25

被引次数

16

摘要： 为分析自然对流对相变材料熔化过程的影响,建立了二维瞬态、固/液相统一的控制方程,采用SIMPLE算法对底部加热、顶部冷却的方腔内相变材料熔化过程进行了数值仿真,研究了方腔内温度场和速度场随时间变化规律,结果表明:自然对流使液相区等效导热系数增大;随着固液界面向上移动,液相区自然对流逐渐增强,流动状态不断变化。

关键词: 自然对流, 非稳态, 相变材料熔化, 数值仿真

Abstract: In order to analyze the influence of natural convection during the melting process of phase change material(PCM),the two dimensional unsteady single-phase governed equations were built and simulations were conducted with SIMPLE method for the melting process in a square cavity heated from below and cooled from above.The characteristics of temperature and flow fields varied with time were studied.The results show that natural convection increases the effective heat conductivity of liquid PCM.With the solid-liquid interface moving upwards,the effect of natural convection is enhanced and the flow patterns change continually.

Key words: Natural convection, Unsteady state, Phase change material melting, Numerical simulation, Spacecraft