This paper presents an experimental study to investigate the combined effect of nanoparticle concentration and fin number in phase change material (PCM) based heat sinks for thermal management system. Here, aluminum and paraffin wax are considered as heat sink (HS) material and PCM, respectively. Aluminum oxide is chosen as nanoparticle material in this study. Tests are conducted with different HS configurations (unfinned, one finned and three finned) and various nanoparticle concentrations (0, 2, 4 and 6 wt%) for $q^{″}$ = 2.0 kW/m². The evolution and propagation of melt front inside the HS is studied through photographic observation. The highest value of operating time is found to be 6470 s for conventional pure PCM based three finned HS assembly. The maximum reduction in melting time is found to be 9 %, 13 % and 26 % for NePCM based unfinned, one finned and three finned heat sinks, respectively. Results indicate that NePCM with lower value of nanoparticle concentration is useful for the heat sinks with SPT value of 60 °C. The maximum enhancement ratio of 1.48 is obtained for unfinned HS filled with 2% nanoparticle concentration for SPT of 60 °C. The maximum value of enhancement ratio is found to be 1.35 and 1.32 for SPT of 65 °C and 70 °C, respectively for the conventional pure PCM based HS.

本文提出了一项实验研究，以研究纳米颗粒浓度和翅片数量在基于相变材料（PCM）的热管理系统散热器中的综合作用。在此，铝和石蜡分别被视为散热器（HS）材料和PCM。在这项研究中，选择氧化铝作为纳米颗粒材料。使用不同的HS配置（未翅片，一个翅片和三个翅片）和各种纳米颗粒浓度（0、2、4和6 wt％）进行测试$q^{\text{'}\text{'}}$ ＝ 2.0kW / m ²。通过照相观察研究了HS内部熔体前沿的演变和传播。对于传统的基于纯PCM的三翅片HS组件，发现工作时间的最大值为6470 s。对于基于NePCM的未散热片，一个散热片和三个散热片的散热器，熔化时间的最大减少分别为9％，13％和26％。结果表明，具有较低纳米颗粒浓度的NePCM可用于SPT值为60°C的散热器。对于60°C的SPT，未填充HS的纳米颗粒浓度为2％时，最大增强比为1.48。对于传统的基于纯PCM的HS，对于65°C和70°C的SPT，增强比的最大值分别为1.35和1.32。