Abstract

This work investigates the effect of particle shape (aspect ratio) on the effective viscosity of nanofluid. Nanoparticles are found to deviate from sphericity on dispersion in thermal base fluids. We presume them to take the shape of prolate spheroid. Also, we have taken into consideration the formation of interfacial layer around these particles and their possible agglomeration. The effective viscosity of these nanofluids is calculated by modifying Kreiger Dougherty model. The relative viscosity is found to increase with increase in volume fraction and eccentricity of the particle. The obtained results are found to compare well with the available experimental data for Al2O3-H2O system.

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