中国空间科学技术

中国空间科学技术

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相变材料熔化过程中自然对流振荡现象数值计算研究

菅鲁京;张加迅;李劲东;   

  1. 中国空间技术研究院;
  • 发布日期:2009-02-25

Numerical Study on Oscillatory Phenomenon of Natural Convection during Melting of Phase Change Material

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

  • Online:2009-02-25

被引次数

7

摘要： 为了解自然对流对相变材料熔化过程的影响,对相变材料液相区自然对流振荡现象进行了研究,建立了固/液相统一的控制方程,采用焓-孔隙度法和Boussinesq假设,模拟了重力条件下熔化过程,结果表明:当瑞利数(Ra)较小时,液相自然对流具有稳定解,随着Ra数增大,自然对流从稳定流动向周期振荡过渡。

关键词: 传热, 热控制, 相变, 自然对流, 数值模拟

Abstract: In order to study influence of natural convection during melting of phase change material,the oscillatory phenomenon of natural convection was investigated.With enthalpy-porosity method and Boussinesq hypothesis,single-phase governed equations were set up and simulation on melting process under gravity was completed.It is shown that when the Rayleigh number Ra is small,the natural convection can be obtained with a steady solution,then the flow changes from a steady state to a periodical oscillatory state with the increase of Ra.