Analysis of Heatline and Massline in Magnetohydrodynamic Double Diffusive Natural Convection of Nanofluid Within a Trapezoidal Enclosure

Double diffusive natural convection of nanofluid within a trapezoidal cavity of various aspect ratios consisting of various nanoparticles including Cu, Ag, Al2O3 and TiO2 in the presence of applied magnetic field in the direction perpendicular to the parallel top and bottom walls is analysed. The side walls of the cavity are maintained at constant temperature, while its horizontal walls are insulated. The irregular physical domain of the problem is transformed to a regular unit square computational domain. The numerical computation is carried out to find heatline, massline, average Nusselt number and average Sherwood number for various values of the Rayleigh number (10(5) <= Ra <= 10(7)), Hartman number (0 <= Ha <= 120), Lewis number (1 <= Le <= 6), buoyancy ratio (-10 <= N <= 10), aspect ratio (0.5 <= A <= 2), solid volume fraction (0 <= phi <= 0.1) and inclination angle (phi). It is found that the intensity of heat and mass transfer increases with the increase in the aspect ratio. It is also observed that as the Lewis number increases, average Nusselt number decreases but average Sherwood number increases. Finally, the predicted results for the average Nusselt number and average Sherwood number are correlated with the studied parameters.