The current two-dimensional (2D) numerical study presents the melting phenomenon and heat transfer performance of the nanocomposite phase change material (NCPCM) based heat sink. Metallic nanoparticles (copper: Cu) of different volume fractions of 0.00, 0.01, 0.03, and 0.05 were dispersed in RT–28HC, used as a PCM. Transient simulations with conjugate heat transfer and melting/solidification schemes were formulated using finite–volume–method (FVM). The thermal performance and melting process of the NCPCM filled heat sink were evaluated through melting time, heat storage capacity, heat storage density, rate of heat transfer and rate of heat transfer density. The results showed that with the addition of Cu nanoparticles, the rate of heat transfer was increased and melting time was reduced. The reduction in melting time was obtained of − 1.36%, − 1.81%, and − 2.56% at 0.01, 0.03, and 0.05, respectively, compared with 0.00 NCPCM based heat sink. The higher heat storage capacity enhancement of 1.87% and lower reduction of − 7.23% in heat storage density was obtained with 0.01 volume fraction. The enhancement in rate of heat transfer was obtained of 2.86%, 2.19% and 1.63%; and reduction in rate of heat transfer density was obtained of − 6.33%, − 21.05% and − 31.82% with 0.01, 0.03, and 0.05 volume fraction of Cu nanoparticles, respectively. The results suggest that Cu nanoparticles of 0.01 volume fraction has the lower melting rate, higher heat storage capacity and heat transfer rate, lower heat storage density and heat transfer rate density which is preferable for passive cooling electronic components.

当前的二维（2D）数值研究显示了基于纳米复合相变材料（NCPCM）的散热器的熔化现象和传热性能。将不同体积分数分别为0.00、0.01、0.03和0.05的金属纳米颗粒（铜：Cu）分散在RT-28HC中，用作PCM。使用有限体积法（FVM）制定了具有共轭传热和熔融/凝固方案的瞬态模拟。通过熔化时间，储热能力，储热密度，热传导率和热传导率来评估NCPCM填充式散热器的热性能和熔化过程。结果表明，通过添加铜纳米颗粒，传热速率增加，熔融时间减少。熔化时间减少了-1.36与基于0.00 NCPCM的散热器相比，在0.01、0.03和0.05时分别为％，− 1.81 ％和− 2.56 ％。体积分数为0.01时，储热密度提高了1.87 ％，降低了-7.23 ％。传热率分别提高了2.86 ％，2.19 ％和1.63 ％ ; 传热密度降低了-6.33 ％，-21.05 ％和-31.82 ％分别具有0.01、0.03和0.05体积分数的Cu纳米粒子。结果表明，体积分数为0.01的Cu纳米粒子具有较低的熔解速率，较高的储热容量和传热速率，较低的储热密度和传热速率密度，这对于被动冷却电子元件是优选的。