Abstract
Among the thermo physical properties of the nano fluids thermal conductivity is the key property which depends on the pertinent parameters of nanoparticles material, volume fraction, size, aspect ratio, base fluid thermo physical properties, temperature, and surfactant. Over last decades, numerous works have reported the higher thermal conductivity of nano fluids than that of the conventional heat transfer fluids with the reason of random motion of nanoparticles and a number of numerical and theoretical models have been proposed. In this article, the current state of knowledge on the several thermal conductivity measurement techniques employed by the researchers along with the factors affecting the thermal conductivity of nano fluids have been presented. This review leads to some directions for future research in nano fluids.
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