Open Access

ARTICLE

Lattice Boltzmann Simulation of MHD Double Dispersion Natural Convection in a C-shaped Enclosure in the Presence of a Nanofluid

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Fluid Dynamics & Materials Processing 2015, 11(1), 87-114. https://doi.org/10.3970/fdmp.2015.011.087

Abstract

MHD double-diffusive natural convective flow in a C-shaped enclosure filled with a Cu/Water nanofluid is investigated numerically using the Lattice Boltzmann Method (LBM). Much care is devoted to the validation of the numerical code. The effects exerted on the flow, concentration and temperature fields by different parameters such as the Rayleigh number (10³−10⁶), the nanoparticle volume concentration (0−0,1), the Lewis number (1-5), the Hartmann number (0−30) and different types of nanoparticles (Cu, Ag, Al₂O₃ and TiO₃ are assessed in detail. Results for stream function, Nusselt and Sherwood numbers are presented and discussed for various parametric conditions. Results indicate that the average Nusselt number increases with an increase in the Rayleigh number and particle volume concentration but it decrease with the Hartman number. Increasing the Lewis number leads to an enhancement of mass transfer but it reduces the heat transfer rate. The type of nanofluid is a key factor for heat transfer enhancement. The highest values are obtained when Ag nanoparticles are used. Mass transfer enhancement is obtained when TiO₃ nanoparticles are used.

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