Empirical correlating equations for predicting the effective thermal conductivity and dynamic viscosity of nanofluids
Empirical correlating equations for predicting the effective thermal conductivity and dynamic viscosity of nanofluids
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DOI：
10.1016/j.enconman.2010.06.072
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发表时间：
2011-01-01
影响因子：
10.4
通讯作者：
Corcione, Massimo
中科院分区：
文献类型：
--
作者：
Corcione, Massimo
在本文中，两个经验关联预测的有效导热系数和纳米流体的动态粘度，大量的实验数据的基础上，在文献中，提出和讨论。据发现，给定的纳米颗粒材料和基液，纳米流体和纯基液的热导率之间的比率随着纳米颗粒体积分数和温度的增加而增加，并且纳米颗粒直径减小。此外，纳米流体和纯基础液体的动态粘度之间的比率也随着纳米颗粒体积分数的增加而增加，并且纳米颗粒直径减小，实际上与温度无关。所提出的方程易于应用，其有效范围广（对于热导率数据，纳米颗粒直径、体积分数和温度的范围为10-150 nm、0.002-0.09和294-324 K，对于动态粘度数据，纳米颗粒直径、体积分数和温度的范围为25-200 nm、0.0001-0.071和293-323 K），从工程的角度来看，使这些方程对于数值模拟和热设计任务都是有用的。(C)2010爱思唯尔有限公司版权所有。
In this paper, two empirical correlations for predicting the effective thermal conductivity and dynamic viscosity of nanofluids, based on a high number of experimental data available in the literature, are proposed and discussed. It is found that, given the nanoparticle material and the base fluid, the ratio between the thermal conductivities of the nanofluid and the pure base liquid increases as the nanoparticle volume fraction and the temperature are increased, and the nanoparticle diameter is decreased. Additionally, also the ratio between the dynamic viscosities of the nanofluid and the pure base liquid increases as the nanoparticle volume fraction is increased, and the nanoparticle diameter is decreased, being practically independent of temperature. The ease of application of the equations proposed, and their wide regions of validity (the ranges of the nanoparticle diameter, volume fraction and temperature are 10-150 nm, 0.002-0.09 and 294-324 K for the thermal conductivity data, and 25-200 nm, 0.0001-0.071 and 293-323 K for the dynamic viscosity data), make such equations useful by the engineering point of view, for both numerical simulation purposes and thermal design tasks. (C) 2010 Elsevier Ltd. All rights reserved.