عنوان مقاله [English]
In this article, the model of a radiator filled with nanofluid and variations in flow pattern and the heat transfer of mixed convection through it is investigated.Al2O3-water nanofluid is used as heat transfer fluid and dynamic viscosity and thermal conductivity according to new models of variable properties are dependent to the diameter of nanoparticles, concentration of nanoparticles, temperature and so on. The right wall of cavity is cold and other walls are adiabatic. Finite volume method is used for the numerical solution of the equations of continuity, momentum and energy, and these equations have been resolved using a FORTRAN computer code. The effect of the Richardson number, solid volume fraction of nanoparticle, height of heated obstacle and its position within radiator on fluid flow and heat transfer are studied. The results are present in streamlines and isotherms contours and also in Nusselt number plots. Results show that increasing solid volume fraction and decreasing Ri number leads to heat transfer increases.