Abstract
In the present paper, fluid flow and free convection heat transfer of a nanofluid in an L-shaped enclosure is studied numerically using the Lattice Boltzmann Method. To consider the effects of Brownian motion, temperature and nanoparticle size on the nanofluid thermal conductivity, Patel et al. model is used. The effects of different parameters such as Rayleigh number (103–106), channel aspect ratio (0.2–0.6), nanoparticle volume concentration (0–0.05) and nanoparticle diameter (20–80nm) on the flow and temperature fields are studied. The obtained results show that nanofluid enhances the heat transfer amount and reducing the channel aspect ratio improves this effect. Moreover, the average Nusselt number decreases with an increase in the nanoparticle diameter and this effect is more pronounced for higher volume concentrations.
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