We study the melting process of phase change materials (PCM) inside a shell-and-tube heat exchanger with punched-fin and slit-fin numerically based on the enthalpy-porosity model in the present paper. The phase change material used is paraffin wax. A comparison of the liquid fraction, the total melting time, and the average temperature was performed to assess the improvement of the melting processes for six fin designs. The numerical results reveal that the usage of punched-fins and slit-fins can improve the melting rate because of the decrease of the blockage effect. For slit-fin cases, the reduction percentage in the total melting time has nearly the same value at different Stephan numbers, and an almost 14.0% improvement is observed compared to the straight fin case, while for punched-fin cases, the reduction percentage varies for different Stephan numbers, and the maximum value of the reduction percentage is 10.1%.

本文基于焓-孔隙率模型，对冲孔翅片和缝翅片管壳式换热器内部相变材料的熔化过程进行了数值研究。使用的相变材料是石蜡。进行了液体分数，总熔化时间和平均温度的比较，以评估六种翅片设计对熔化过程的改进。数值结果表明，由于减少了阻塞效应，使用冲切翅片和切缝翅片可以提高熔化速率。对于长翅片情况，在不同的斯蒂芬数下，总熔化时间的减少百分比几乎具有相同的值，与直翅片情况相比，观察到几乎提高了14.0％，而对于冲翅片情况，