Numerical simulation of melting process of phase change energy storage unit under microgravity
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摘要:
为探究微重力环境中，通过肋片强化了传热的相变储能单元中相变材料融化过程，通过数值模拟方法探究了微重力作用时相变材料融化过程中传热特性。通过地面实验与重力作用下数值模拟结果对比验证数值模拟方法的准确性，对比重力和微重力作用2种情况下数值模拟结果以揭示微重力环境中相变材料融化过程的特性。结果表明，当相变储能单元受微重力作用时，相变材料融化速率明显下降，热量主要通过热传导传递，融化的相变材料从顶端膨胀溢出向空间扩散，局部低温区域在相变储能单元中上部。
Abstract:In order to explore the melting process of phase change materials in the phase change energy storage unit with fins in microgravity environment, the heat transfer and flow characteristics of phase change materials in microgravity environment are investigated by numerical simulation. The accuracy of the numerical simulation was verified by comparing the numerical simulation results and experimental results in gravity environment. The numerical simulation results under both gravity and microgravity effects were compared to reveal the characteristics of the phase change material melt process in microgravity environment. The results show that when the phase change energy storage unit is in microgravity environment, the melting rate of the phase change material obviously decreases, and the heat is mainly transferred by the heat conduction. The expansion of the melted phase change material extends from the top to the space, and the local low temperature zone is in the upper-middle of the phase change energy storage unit.
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图 4 相变材料融化过程数值模拟与实验结果对比
Figure 4. Comparison of numerical simulation and experimental results for melting process of phase change material
图 7 相变材料融化过程中速度分布
Figure 7. Velocity distribution for melting process of phase change material
图 8 相变材料融化过程中温度分布
Figure 8. Temperature distribution for melting process of phase change material
图 9 相变材料融化过程中固-液两相分布
Figure 9. Solid-liquid distribution for melting process of phase change material
表 1 各物质物性参数
Table 1. Physical parameters of various materials
物质 导热系数/
(W·m-1·K-1)密度/
(kg·m-3)比热/(J·kg-1·K-1) 动力黏度/
(kg·m-1·s-1)相变温度/℃ 相变潜热/
(kJ·kg-1)十八烷 0.1507 
2160 0.00346 27~29 244 铝 202.4 2719 871 空气 2.42×10-5 1.2×10－8T2－1.134×10－5+3.498×10－3 1.006 
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