Chandrasekar Murugesan, Suresh Sivan, Srinivasan Ramasamy, Bose Arumugam Chandra
Department of Mechanical Engineering, National Institute of Technology, Tiruchirappalli 620015, India.
J Nanosci Nanotechnol. 2009 Jan;9(1):533-8. doi: 10.1166/jnn.2009.j025.
Nanofluids are identified suitable for micro and nano scale heat transfer applications where a high heat flux is required. These fluids are still in their early developmental stage and the exact heat transfer mechanism in them is not known yet. Due to this situation, there exists no suitable theoretical model for predicting the thermal conductivity of nanofluid. In this paper two new models for nanofluid thermal conductivity are developed. The first model which is based on Weber formula is used to predict the nanofluid thermal conductivity. The thermal conductivity of Al2O3/water, CuO/water, TiO2/water and TiO2/ethylene glycol nanofluids predicted by this model were compared with the published experimental data. The second model is used to analyze the influence of the effects of particle shape, nanolayer thickness and Brownian motion in enhancing thermal conductivity of nanofluids.
纳米流体被认为适用于需要高热通量的微纳尺度传热应用。这些流体仍处于早期发展阶段,其确切的传热机制尚不清楚。由于这种情况,不存在用于预测纳米流体热导率的合适理论模型。本文开发了两种新的纳米流体热导率模型。基于韦伯公式的第一个模型用于预测纳米流体的热导率。将该模型预测的Al2O3/水、CuO/水、TiO2/水和TiO2/乙二醇纳米流体的热导率与已发表的实验数据进行了比较。第二个模型用于分析颗粒形状、纳米层厚度和布朗运动对提高纳米流体热导率的影响。