Abstract
Abstract The lattice Boltzmann simulation of natural convection fluid flow and heat transfer in a square-circle annulus is carried out. A comprehensive discussion regarding the treatment of curved boundary condition for temperature and velocity is presented. The annulus is filled with CuO-water nanofluid. The dynamic viscosity of nanofluid is estimated using KKL (Koo-Kleinstreuer-Li) model. The second law analysis is added to the investigation order to show the effect of different parameters on the irreversibility. The Rayleigh number (103≤Ra≤106), nanoparticle concentration (0 ≤ ϕ ≤ 0.04) and the aspect ratio of inner square cylinder are the governing parameters. The influence of the mentioned parameters on the nanofluid flow, temperature field, local and total entropy generation, Bejan number and average Nusselt number are presented, comprehensively.
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