文章摘要
超重力下相变材料熔化过程的数值模拟
Numerical simulation of the influence of hypergravity on the melting process of a phase change material
投稿时间:2020-02-19  修订日期:2020-03-05
DOI:
中文关键词: 超重力,PCM,熔化过程,换热,数值模拟
英文关键词: hypergravity  PCM  melting process  heat transfer  numerical simulation
基金项目:国家自然科学基金(51806104)、江苏省自然科学基金(BK20180426)、航空科学基金(20182852024)、中央高校基本科研业务费专项资金(3082018NS2018006)、江苏高校优势学科建设工程资助项目
作者单位E-mail
赖柄竹 南京航空航天大学 飞行器环境控制与生命保障工业和信息化部重点实验室 1115853607@qq.com 
潘文彬 南京航空航天大学 飞行器环境控制与生命保障工业和信息化部重点实验室  
李玲 南京航空航天大学 飞行器环境控制与生命保障工业和信息化部重点实验室  
邸志惠 南京航空航天大学 飞行器环境控制与生命保障工业和信息化部重点实验室  
陈萱 南京航空航天大学 飞行器环境控制与生命保障工业和信息化部重点实验室  
许玉 南京航空航天大学 飞行器环境控制与生命保障工业和信息化部重点实验室 cahfxuyu@nuaa.edu.cn 
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中文摘要:
      通过数值模拟的方法,研究了地球重力和超重力条件下相变材料(PCM)的熔化过程,分析了超重力对PCM熔化过程的影响。采用的超重力大小为五倍和十倍地球重力,方向则与热流进入方向相反。模拟结果表明,由于PCM导热系数偏小,熔化初期加热面发生过热,需通过耦合其他强化换热措施予以减弱甚至消除。超重力对于PCM熔化过程的影响十分显著。随着超重力的增加,熔化界面的波动幅度增大,熔化速度加快,加热面温度下降,这是因为熔化过程中液相的自然对流作用显著增强。此外,超重力对PCM熔化过程的增强幅度会随超重力的增加而减小,表明超重力的强化换热作用有一定限度,当超过一定值时,该强化作用的效果相对减弱。
英文摘要:
      The melting process of a phase change materials (PCM) under the Earth gravity and hypergravity was studied through numerical simulation method, and the influence of hypergravity on the melting process of PCM was analyzed. The hypergravity value is five and ten times of the Earth gravity, and the hypergravity direction is opposite to that of the incoming heat flux. The simulation results indicate that the overheating occurs on the heating wall at the beginning of the melting process, due to the small thermal conductivity of the PCM, and other heat transfer enhancement methods should be employed to weaken even eliminate the overheating. The influence of the hypergravity on melting process of the PCM is significant. The fluctuation amplitude of phase interface increases, the melting rate increases, and the temperature of the heating wall decreases with the increasing hypergravity, because of the obvious enhancement of the natural convection of the liquid PCM in the melting process. In addition, the enhancement amplitude of the hypergravity on the melting process decreases with the increasing hypergravity, implying that the enhancement of the hypergravity has a limitation, and would weaken when the hypergravity exceeds certain values.
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