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首页> 外文期刊>Journal of Heat Transfer >Effect of Brownian Motion on Thermal Conductivity of Nanofluids
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Effect of Brownian Motion on Thermal Conductivity of Nanofluids

机译:布朗运动对纳米流体导热系数的影响

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Nanofluids, I.e., liquids containing nanometer sized metallic or nonmetallic solid particles, show an increase in thermal conductivity compared to that of the pure liquid. In this paper, a simple model for predicting thermal conductivity of nanofluids based on Brownian motion of nanoparticles in the liquid is developed. A general expression for the effective thermal conductivity of a colloidal suspension is derived by using ensemble averaging under the assumption of small departures from equilibrium and the presence of pairwise additive interaction potential between the nanoparticles. The resulting expression for thermal conductivity enhancement is applied to the nanofluids with a polar base fluid, such as water or ethylene glycol, by assuming an effective double layer repulsive potential between pairs of nanoparticles. It is shown that the model predicts a particle size and temperature dependent thermal conductivity enhancement. The results of the calculation are compared with the experimental data for various nanofluids containing metallic and nonmetallic nanoparticles.
机译:纳米流体,即,包含纳米级金属或非金属固体颗粒的液体,与纯液体相比,其导热率增加。在本文中,建立了一个基于纳米粒子在液体中的布朗运动来预测纳米流体导热系数的简单模型。胶体悬浮液有效导热系数的一般表达式是在总体上偏离平衡很小且纳米颗粒之间存在成对加性相互作用的假设下,通过使用系综平均得出的。通过假设成对的纳米颗粒之间具有有效的双层排斥势,将所得的用于提高导热率的表达式应用于具有极性基础流体(例如水或乙二醇)的纳米流体。结果表明,该模型可以预测颗粒大小和与温度有关的导热系数。将计算结果与包含金属和非金属纳米粒子的各种纳米流体的实验数据进行比较。

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