The present numerical study explores the use of fluid pockets in the heat sink to enhance heat transfer in high power LEDs. A robust heat sink model has been presented and evaluated the heat transfer characterization in terms of reduced LED junction temperature via natural convection and studied the effect of fluid flow in the pockets of heat sink. The junction temperature of the LED has been measured, for enhanced heat transfer and the results have been compared with conventional heat sink. The cooling fluid inside the fluid pockets absorbs heat generated by LEDs resulting in exchange of heat from heat sink surface to the liquid medium in the fluid pockets. The heat gain causes the fluid to flow against gravity due to density variation, raises the mixture of liquid inside the fluid pockets and flow back by gravity effect when it is condensed by the extended fin surface. The performance of the heat sink with fluid pockets has been found to be better than normal heat sink of same geometry due to its ability to conduct heat by the presence of liquid. Fluid pockets filled with de-ionized water in the heat sink have a noticeable effect on heat removal rate. A series of case studies have been done for accurate and efficient heat transfer output; these results then have been used as the benchmark to validate the experimental results. The numerical results have been found to be in good agreement with experimental results.

中文翻译：

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大功率LED带有流体腔的散热器的数值研究

本数值研究探索了使用散热器中的流体袋来增强大功率LED中的热传递。提出了鲁棒的散热器模型，并通过自然对流降低了LED结温，评估了传热特性，并研究了流体在散热器袋中的流动影响。已测量了LED的结温，以增强传热，并将结果与​​常规散热器进行了比较。流体腔中的冷却液吸收LED产生的热量，从而导致热量从散热器表面向流体腔中的液体介质进行热交换。由于密度变化，热量的增加导致流体逆着重力流动，提升液袋内部的液体混合物，并在延伸的翅片表面冷凝时因重力作用而回流。已经发现具有流体袋的散热器的性能比相同几何形状的普通散热器更好，这是因为其能够通过液体的存在来导热。散热器中装有去离子水的流体袋对散热率有显着影响。已经进行了一系列案例研究，以实现准确而有效的传热输出。然后将这些结果用作验证实验结果的基准。数值结果与实验结果吻合良好。已经发现具有流体袋的散热器的性能比相同几何形状的普通散热器更好，这是因为其能够通过液体的存在来导热。散热器中装有去离子水的流体袋对散热率有显着影响。已经进行了一系列案例研究，以实现准确而有效的传热输出。然后将这些结果用作验证实验结果的基准。数值结果与实验结果吻合良好。已经发现具有流体袋的散热器的性能优于相同几何形状的普通散热器，这是因为其能够通过液体的存在来导热。散热器中装有去离子水的流体袋对散热率有显着影响。已经进行了一系列案例研究，以实现准确而有效的传热输出。然后将这些结果用作验证实验结果的基准。数值结果与实验结果吻合良好。然后将这些结果用作验证实验结果的基准。数值结果与实验结果吻合良好。然后将这些结果用作验证实验结果的基准。数值结果与实验结果吻合良好。