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Heat-dissipation performance of cylindrical heat sink with perforated fins
International Journal of Thermal Sciences ( IF 4.5 ) Pub Date : 2021-06-15 , DOI: 10.1016/j.ijthermalsci.2021.107132
Gihyun Song , Dong-Hwa Kim , Dong-Hyung Song , Ju-Bin Sung , Se-Jin Yook

The temperature of light-emitting diode (LED) light bulbs must be managed to maintain their performance and increase their lifespan, and the design and application of an appropriate LED heat sink are particularly important for temperature management. This study investigated the heat-dissipation performance of a heat sink with perforated fins on a cylindrical base. To improve the heat-dissipation performance of the heat sink, the effects of the size and number of perforations per fin were examined. A larger number of perforations with a smaller size were found to be favorable for the improvement of the heat-dissipation performance. Both the size and number of perforations, however, had threshold values for lowering the thermal resistance. Moreover, the heat-dissipation performance was numerically analyzed according to the Rayleigh number, number of fins, fin inclination angle, and orientation angle of the heat sink. In addition, the numerical analysis method used was experimentally verified. As the number of fins increased, the thermal resistance decreased because of the corresponding increase in the heat-dissipation area of the heat sink. Furthermore, the thermal resistance was found to vary with respect to the fin inclination angle, making it possible to reduce the degradation of the heat-dissipation performance by varying the orientation angle. On this basis, a correlation was derived for predicting the thermal resistance of the cylindrical heat sink with perforated fins. The derived correlation accurately predicted the thermal resistance within a maximum error of 5.25%.



中文翻译:

带穿孔翅片的圆柱形散热器的散热性能

必须管理发光二极管 (LED) 灯泡的温度以保持其性能并延长其使用寿命,而适当的 LED 散热器的设计和应用对于温度管理尤为重要。本研究调查了在圆柱形底座上带有穿孔翅片的散热器的散热性能。为了提高散热器的散热性能,研究了每个翅片的穿孔尺寸和数量的影响。发现数量较多、尺寸较小的穿孔有利于提高散热性能。然而,穿孔的大小和数量都有降低热阻的阈值。此外,根据瑞利数对散热性能进行了数值分析,散热片的鳍片数量、鳍片倾角和方向角。此外,所使用的数值分析方法也得到了实验验证。随着鳍片数量的增加,由于散热器的散热面积相应增加,热阻降低。此外,发现热阻相对于翅片倾斜角而变化,使得可以通过改变取向角来减少散热性能的劣化。在此基础上,推导出了用于预测带穿孔翅片的圆柱形散热器的热阻的相关性。导出的相关性准确地预测了热阻,最大误差为 5.25%。所使用的数值分析方法经过实验验证。随着鳍片数量的增加,由于散热器的散热面积相应增加,热阻降低。此外,发现热阻相对于翅片倾斜角而变化,使得可以通过改变取向角来减少散热性能的劣化。在此基础上,推导出了用于预测带穿孔翅片的圆柱形散热器的热阻的相关性。导出的相关性准确地预测了热阻,最大误差为 5.25%。所使用的数值分析方法经过实验验证。随着鳍片数量的增加,由于散热器的散热面积相应增加,热阻降低。此外,发现热阻相对于翅片倾斜角而变化,使得可以通过改变取向角来减少散热性能的劣化。在此基础上,推导出了用于预测带穿孔翅片的圆柱形散热器的热阻的相关性。导出的相关性准确地预测了热阻,最大误差为 5.25%。发现热阻随翅片倾斜角而变化,从而可以通过改变取向角来减少散热性能的劣化。在此基础上,推导出了用于预测带穿孔翅片的圆柱形散热器的热阻的相关性。导出的相关性准确地预测了热阻,最大误差为 5.25%。发现热阻随翅片倾斜角而变化,从而可以通过改变取向角来减少散热性能的劣化。在此基础上,推导出了用于预测带穿孔翅片的圆柱形散热器的热阻的相关性。导出的相关性准确地预测了热阻,最大误差为 5.25%。

更新日期:2021-06-15
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