Numerical Investigation of Mixed Convection incorporating Ag-H2O Nanofluid inside Square Enclosure for Different Heater Locations

Abstract

The present study is an attempt to elucidate mixed convection flow in a shear driven enclosure incorporating silver nanofluid with a square cylindrical heat source placed at several locations. The simplicity from the point of view of computational expense has been achieved by carrying out 2-D simulations using the finite volume method. The effects of the change in heat source locations are studied observing the isotherms and average Nusselt number with respect to the concentration of silver in the nanofluid (0%, 1%, 3%, and 5%) and Richardson number (0.01, 0.1, 1 and 10) as decisive parameters. Prandtl number and Grashof number have been fixed to 6.2 and 104 respectively. The investigation is undertaken for five different locations of the square cylindrical heater. The study shows that maximum heat dissipation at higher Reynolds number occurs when the heater is placed near the bottom right corner of the enclosure; whereas in case of low Reynolds number, the heater when placed near the top left a corner of the enclosure yields maximum heat transfer. The investigation also yields a positive correlation between average Nusselt number with increasing silver concentration.

Mixed Convection Inside a Cavity Incorporating Cu-H2O Nanofluid with Conducting Cylinders Placed at Optimum Position

“…Hence, nanofluid is developed by suspending nanoparticles to conventional fluids to upsurge the conductivity of the base fluid. The different locations of the heat source inside the cavity were observed by Panigrahi et al (2019) [1]. They mentioned that the location of the heater is a very important parameter in the heat transfer in a confined cavity.…”

Numerical Study of Free Convection inside the Differentially Heated Cavity incorporating Variable Property Al2O3-H2O Nanofluid

“…Jang et al, 2004, showed that temperature distribution inside the cavity filled with nanofluid is highly affected by nanoparticle concentration, size, and heat exchange between hot and cold sides. The significance of the heater location within the enclosure was examined by Panigrahi et al, 2019. They found out the role of the heater location for obtaining improved heat transfer.…”

Numerical Investigation of Ag-H2O Nanofluid in a Lid Driven Square Cavity with Different Shaped Conducting and Insulating Cylinders Placed at Centre

“…Their investigation showed the locations of the cylinder for which maximum heat transfer was obtained. Panigrahi et al [14] observed the effect of heater located inside the cavity. They also mentioned that importance of heater location in the heat transfer enhancement.…”