Experimental determination of thermal conductivity of three nanofluids and development of new correlations
Experimental determination of thermal conductivity of three nanofluids and development of new correlations
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DOI：
10.1016/j.ijheatmasstransfer.2009.06.027
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发表时间：
2009-10-01
影响因子：
5.2
通讯作者：
Das, Debendra K.
中科院分区：
文献类型：
--
作者：
Vajjha, Ravikanth S.;Das, Debendra K.
已进行了实验研究，以确定三种纳米流体的热导率，其中氧化铝，氧化铜和氧化锌纳米颗粒分散在60：40（按质量）的乙二醇和水的混合物的基础流体。实验温度范围为298 ~ 363 K，颗粒体积浓度为10%。结果表明，纳米流体的热导率的增加相比，随着纳米颗粒的体积浓度的增加的基础流体。热导率也随着温度的增加而显著增加。现有的几个模型的热导率进行了比较，从这些纳米流体的实验数据，他们没有表现出良好的协议。因此，开发了一种模型，该模型是现有模型的改进，其结合了经典的麦克斯韦模型和布朗运动效应，以将纳米流体的热导率解释为温度的函数。颗粒体积浓度，纳米颗粒的性质，和基础流体，这符合实验数据。(C)2009爱思唯尔有限公司版权所有。
Experimental investigations have been carried out for determining the thermal conductivity of three nanofluids containing aluminum oxide, copper oxide and zinc oxide nanoparticles dispersed in a base fluid of 60:40 (by mass) ethylene glycol and water mixture. Particle volumetric concentration tested was up to 10% and the temperature range of the experiments was from 298 to 363 K. The results show an increase in the thermal conductivity of nanofluids compared to the base fluids with an increasing volumetric concentration of nanoparticles. The thermal conductivity also increases substantially with an increase in temperature. Several existing models for thermal conductivity were compared with the experimental data obtained from these nanofluids, and they do not exhibit good agreement. Therefore, a model was developed, which is a refinement of an existing model, which incorporates the classical Maxwell model and the Brownian motion effect to account for the thermal conductivity of nanofluids as a function of temperature. particle volumetric concentration, the properties of nanoparticles, and the base fluid, which agrees well with the experimental data. (C) 2009 Elsevier Ltd. All rights reserved.