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首页> 外文期刊>International Journal of Heat and Mass Transfer >Thermal performance of miniature loop heat pipe with graphene-water nanofluid
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Thermal performance of miniature loop heat pipe with graphene-water nanofluid

机译：石墨烯-水纳米流体的微型回路热管的热性能

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The heat transfer performance of miniature loop heat pipe with graphene-water nanofluid is experimentally analysed. The miniature loop heat pipe used in the study consisted of a square flat evaporator having a size of 20 mm × 20 mm, a compensation chamber placed above the evaporator and transport lines having different diameters. The difference in diameter prevents reverse flow of vapour through liquid line and also increases the flow rate of condensed liquid through liquid line. An optimum filling ratio of 30% of the total volume of the heat pipe is used in all the experiments. The experiments are conducted for a heat load range of 20-380 W using water and graphene-water nanofluid in vertical orientation. The graphene nanosheets having 1-5 nm thickness with very low volume fractions of 0.003%, 0.006% and 0.009% are mixed with distilled water to prepare nanofluid. The experimental results indicate that the nanofiuids improve the thermal performance of the miniature loop heat pipe and lower the evaporator interface temperature compared to distilled water. An optimum concentration of 0.006% provides the maximum improvement in heat transfer. The lowest thermal resistance value (0.083 K/W at 380 W) is observed for the optimum concentration and it is 21.6% below the value of distilled water. The evaporator interface temperature reached only 106.3 ℃ at 380 W which shows a decrease of 10.3 ℃ compared to distilled water. The experimental results confirm suitability of miniature loop heat pipe filled with graphene-water nanofluid for cooling applications.
机译：实验分析了石墨烯-水纳米流体的微型回路热管的传热性能。研究中使用的微型回路热管由尺寸为20 mm×20 mm的方形扁平蒸发器，放置在蒸发器上方的补偿室和直径不同的输送线组成。直径的差异防止了蒸汽通过液体管线的反向流动，并且还增加了冷凝的液体通过液体管线的流速。在所有实验中均使用了热管总体积的30％的最佳填充率。使用垂直取向的水和石墨烯-水纳米流体，在20-380 W的热负荷范围内进行了实验。将具有1-5nm厚度的0.003％，0.006％和0.009％的非常低的体积分数的石墨烯纳米片与蒸馏水混合以制备纳米流体。实验结果表明，与蒸馏水相比，纳米流体改善了微型回路热管的热性能，并降低了蒸发器的界面温度。最佳浓度为0.006％，可以最大程度地改善热传递。对于最佳浓度，观察到最低的热阻值（在380 W时为0.083 K / W），比蒸馏水低21.6％。 380 W时，蒸发器界面温度仅达到106.3℃，与蒸馏水相比，降低了10.3℃。实验结果证实了填充石墨烯-水纳米流体的微型回路热管在冷却应用中的适用性。

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