泡沫金属铜/石蜡相变蓄热过程的数值模拟

在装有纯石蜡的相变蓄热箱中加入泡沫金属铜,利用Fluent软件,模拟研究石蜡相变蓄热箱在加入泡沫金属铜后,箱内石蜡温度分布的均匀性、稳定性及相变蓄热的变化规律。模拟结果显示,泡沫金属铜的加入,大大提高了石蜡的蓄热性能,缩短了石蜡相变的时间;且加入泡沫铜后,石蜡内部温差明显减小,温度分布更加均匀,并且有效缓解了自然对流造成的顶部过热和底部不熔化现象。数值模拟结果与实验测试数据平均误差15.7%,与实测值吻合较好。

Numerical simulation of foam metal copper/paraffin phase change thermal storage process

The uniformity and stability of the paraffin temperature distribution in the phase change heat storage box with the addition of foam copper into the pure paraffin were predicted by Fluent software. The simulated results showed that the addition of foam copper greatly improved the heat recovery performance of paraffin and shortened paraffin phase transition time. Moreover, after adding foam copper, the paraffin inside temperature difference decreased significantly, the temperature distribution became more uniform, and top overheating and bottom un-melting caused by nature convection were effectively alleviated. The average error between the simulated results and test data were within 15.7%, which was in good agreement with the measured values.