Present paper reports the thermal performance of various phase change material (PCM)‐based heat sinks during melting process for cooling of portable electronic devices through experimental investigations. Heat sink configurations include unfinned with pure PCM, finned with pure PCM, unfinned with metallic foam (MF)–PCM composite, and finned with MF–PCM composite. Paraffin wax is used as PCM, and tests have been carried out for various input heat flux values (1.3, 2.0, and 2.7 kW/m²) at different volume fractions of PCM (0, 0.50, 0.86, and 1). The effect of various parameters such as PCM volume fraction, heat sink type, and heat flux on the stretching of operating time to achieve a set point temperature (SPT) is studied. Results obtained from the current experimental investigation are compared with the existing test results. Also, unfinned heat sink without and with PCM is used for baseline comparison. The evolution and propagation of melt front inside the heat sink are studied through photographic observation. The enhancement in operating time is found to vary with the SPT and heat flux values. MF–PCM‐based heat sinks are more advantageous for higher value of input heat flux (2.0 and 2.7 kW/m²). For q^″ = 1.3 and 2.0 kW/m², four‐finned MF–PCM‐based heat sink exhibits better performance; while three‐finned MF–PCM‐based heat sink shows best performance at q^″ = 2.7 kW/m². The highest enhancement ratio of ~2.97 is obtained at 1.3 and 2.7 kW/m² for four‐finned MF–PCM heat sink and three‐finned MF–PCM heat sink, respectively. Also, three‐finned heat sink provides higher heat transfer rate and highest thermal conductance at q^″ = 2.7 kW/m².

中文翻译：

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基于相变材料的散热器对电子部件进行被动冷却的热性能：一项实验研究

本白皮书通过实验研究报告了在熔化便携式电子设备的过程中，各种基于相变材料（PCM）的散热器的热性能。散热器配置包括不带纯PCM的翅片，带纯PCM的翅片，不带金属泡沫（MF）-PCM复合材料的翅片和带MF-PCM复合材料的翅片。石蜡用作PCM，并且已经针对各种输入热通量值（1.3、2.0和2.7 kW / m ^{2）进行了测试。}）在PCM的不同体积分数下（0、0.50、0.86和1）。研究了诸如PCM体积分数，散热器类型和热通量等各种参数对延长工作时间以达到设定点温度（SPT）的影响。将当前实验研究获得的结果与现有测试结果进行比较。另外，不带和带PCM的未翅片散热器也用于基线比较。通过照相观察研究了散热器内部熔体前沿的演化和传播。发现工作时间的增加随SPT和热通量值的变化而变化。基于MF–PCM的散热器对于更高的输入热通量（2.0和2.7 kW / m ²）更具优势。对于q ^'' = 1.3和2.0 kW / m ²，基于四翅片MF-PCM的散热器表现出更好的性能；而基于三翅片MF-PCM的散热器在q ^” = 2.7 kW / m ^2时表现出最佳性能。四翅片MF-PCM散热器和三翅片MF-PCM散热器分别在1.3 kW / m ²和2.7 kW / m ^2时获得最高的增强比。而且，三翅片式散热器在q ^” = 2.7 kW / m ^2时提供更高的热传递率和最高的热导率。