The research community has been perplexed for the past five years with the unusually high effective thermal conductivity of nanofluids. Although various mechanisms and models have been proposed in the literature to explain the high conductivity of these nanofluids, no concrete conclusions have been reached. Through an order-of-magnitude analysis of various possible mechanisms, we show that convection caused by the Brownian movement of these nanoparticles is primarily responsible for the enhancement in the thermal conductivity of such colloidal nanofluids. We also introduce a convective-conductive model which accurately captures the effects of particle size, choice of base liquid, thermal interfacial resistance between the particles and liquid, temperature, etc. This model is a combination of the Maxwell-Garnett (MG) conduction model and the convection caused by the Brownian movement of the nanoparticles, and reduces to the MG model for large particle sizes.
- Heat Transfer Division and Electronic and Photonic Packaging Division
Brownian-Motion-Based Convective-Conductive Model for the Thermal Conductivity of Nanofluids
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Prasher, R. "Brownian-Motion-Based Convective-Conductive Model for the Thermal Conductivity of Nanofluids." Proceedings of the ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. Heat Transfer: Volume 1. San Francisco, California, USA. July 17–22, 2005. pp. 343-353. ASME. https://doi.org/10.1115/HT2005-72048
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