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Development of CuO-ethylene glycol nanofluids for efficient energy management: Assessment of potential for energy recovery

机译:开发用于有效能源管理的CuO-乙二醇纳米流体:评估能源回收潜力

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Ethylene glycol (EG) plays an important role as coolant in sub-artic and artic regions owing to its low freezing point. However one of the limitations of ethylene glycol for energy management is its low thermal conductivity, which can be improved by addition of nanoparticles. In the present work, cupric oxide nanoparticles have been synthesized followed by dispersion in ethylene glycol through extended probe ultrasonication without addition of chemical dispersing agent. Temperature dependency of thermal conductivity of 1 vol% CuO-ethylene glycol nanofluid exhibited a minimum at a critical temperature corresponding to lower thickness of interfacial layers and negligible Brownian motion. The influence of liquid layering on thermal conductivity was predominant at temperatures below critical temperature leading to higher thermal conductivity at lower temperature. Brownian motion-induced microconvection resulted in thermal conductivity increase with temperature above the critical temperature. About 14.1% enhancement in thermal conductivity was obtained at 50 degrees C for 1 vol% CuO-ethylene glycol nanofluid. The viscosity of CuO-ethylene glycol nanofluid was lower than the viscosity of ethylene glycol at temperatures below 50 degrees C and 120 degrees C for 1 vol% and 0.5 vol% CuO-ethylene glycol nanofluids. Our data reveal that the CuO-ethylene glycol nanofluids are better coolants than ethylene glycol for transient cooling under constant heat flux conditions with 11.8% enhancement in heat transfer rate for 1 vol% CuO-ethylene glycol nanofluid. Hence the use of ethylene glycol-based nanofluids is a promising approach for energy management. (C) 2015 Elsevier Ltd. All rights reserved.
机译:乙二醇(EG)由于其低凝固点,在亚动脉和动脉区域起着重要的冷却剂作用。然而,乙二醇在能量管理方面的局限性之一是其低导热性,这可以通过添加纳米颗粒来改善。在本工作中,已经合成了氧化铜纳米颗粒,然后通过扩展探针超声处理在乙二醇中进行分散,而无需添加化学分散剂。 1vol%CuO-乙二醇纳米流体的导热系数对温度的依赖性在临界温度下表现出最小值,这对应于较低的界面层厚度和可忽略的布朗运动。在低于临界温度的温度下,液体分层对热导率的影响主要,导致在较低温度下较高的热导率。布朗运动引起的微对流导致导热率随温度高于临界温度而增加。对于1体积%的CuO-乙二醇纳米流体,在50℃下获得约14.1%的热导率提高。对于1体积%和0.5体积%的CuO-乙二醇纳米流体,CuO-乙二醇纳米流体的粘度低于在低于50℃和120℃的温度下的乙二醇的粘度。我们的数据表明,在恒定热通量条件下进行瞬态冷却时,CuO-乙二醇纳米流体是比乙二醇更好的冷却剂,对于1vol%的CuO-乙二醇纳米流体,其传热速率提高了11.8%。因此,使用基于乙二醇的纳米流体是一种有希望的能量管理方法。 (C)2015 Elsevier Ltd.保留所有权利。

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