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Experimental investigation on the cooling performance of polystyrene encapsulated n-Docosane based nanofluid in mini channel heat sink
Heat and Mass Transfer ( IF 2.2 ) Pub Date : 2021-04-11 , DOI: 10.1007/s00231-021-03068-z
Mathew Joseph , E V Jitheesh , V Sajith

The present work focusses on the comparative study of cooling performance of nano encapsulated phase change material (nanoPCM) based heat transfer fluid (PCM nanofluid) and deionized water in a minichannel heat sink (MCHS) with a hydraulic diameter of 2.6 mm. Polystyrene encapsulated n-Docosane was synthesised by mini emulsion polymerisation. The melting point and latent heat of nanoPCM was found to be 42.6 °C and 180.6 J/g respectively. PCM nanofluid with concentrations ranging from 0.6 to 1.5 vol.% was prepared by dispersing nanoPCM in deionized water. High zeta potential values indicated excellent suspension stability of PCM nanofluid. Viscosity of PCM nanofluid increased slightly, whereas thermal conductivity and density were comparable to deionized water. Experiments were conducted at different flow rates (75–450 mL/min) in the laminar flow regime under uniform heat flux of 2.6 W/cm2. Even though, PCM nanofluid at 0.7 vol.% showed an enhancement in heat transferup to 44% at 225 mL/min, as compared to water, pumping power increased up to 17%. However, the Figure of Merit values greater than unity shows the insignificance of increase in pumping power over heat transfer enhancement obtained for PCM nanofluid. The improved cooling performance at low flow rates makes PCM nanofluid a propitious coolant over conventional fluids for electronics cooling.



中文翻译:

聚苯乙烯包裹的正二十二烷基纳米流体在微通道散热器中冷却性能的实验研究

目前的工作集中在水力直径为2.6 mm的微通道散热器(MCHS)中基于纳米封装相变材料(nanoPCM)的传热流体(PCM nanofluid)和去离子水的冷却性能的比较研究。通过小乳液聚合合成聚苯乙烯包封的正二十烷。发现nanoPCM的熔点和潜热分别为42.6°C和180.6 J / g。通过将nanoPCM分散在去离子水中来制备浓度范围为0.6-1.5%(体积)的PCM纳米流体。高的ζ电势值表明PCM纳米流体具有出色的悬浮稳定性。PCM纳米流体的粘度略有增加,而热导率和密度与去离子水相当。2。即使与水相比,0.7体积%的PCM纳米流体在225 mL / min的热传递下也可提高至44%,泵送功率最多可提高17%。但是,品质因数值大于1表示泵送功率相对于PCM纳米流体获得的传热增强效果不明显。在低流速下改进的冷却性能使PCM纳米流体成为了用于电子冷却的传统冷却剂,胜于传统的冷却剂。

更新日期:2021-04-11
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