NUMERICAL ANALYSIS OF NANOFLUID COOLING EFFICIENCY OF HOT MULTISHAPED CYLINDER IN VERTICAL POROUS CHANNEL

In this study a mesoscopic numerical analysis of mixed convection and nanofluid cooling efficiency is conducted for a heat exchanger. The later is composed of porous vertical channel crossed by shaped cylinder designing a solar concentrator. Various shape forms of the concentrator are tested and the effect of the fluid and the porous medium parameters are analyzed. The horizontal elongated elliptical shape was found to be the most efficient. Results are mainly presented using response surfaces of the Nusselt number as a function of influencing factors. The conducted optimization for the use of porous matrix inside the channel as well as the determination of optimal factors values will augment the heat transfer between the heat exchanger and the flowing nanofluid. Correlations are given for broad ranges of problem factors.