Water-Alomina nanofluid natural convection in a square cavity with two pairs of source-sink

This paper presents a numerical study on the natural convection in a square cavity, with two pair of heat source and sink and filled with a alumina-water nanofluid. heat source and sink have Th and Tc temperatures respectively. For this purpose, we used a Fortran program based on Finite Volume Method and SIMPLE algorithm. The effects of parameters such as volume fraction for 0 to 0.05 percent, Rayleigh number for 103,104, 105 and 106 and location of two pair of source-sink on the flow and temperature fields and heat transfer rate have been examined. The obtained results show that by increasing the Rayleigh number and the volume fraction of the nanoparticles, the rate of heat transfer is increased. Also, The results show that, increasing the nanoparticles volume fraction at low Rayleigh numbers (103,104) has the more enhancement effect on the local and average Nusselt number in compared to the high Rayleigh ‌numbers(105,106).