Laminar natural double diffusive convection in a square cavity containing a square hot obstacle and filled with various types of Nanofluids: Benchmark

Abstract

This article represents a set of results numerically studied in the framework of laminar double diffusive natural convection. We have investigated the thermophysical comportment of Water-based incompressible nanofluids circulating, due to buoyancy forces, inside a two-dimensional enclosed rectangular cavity for two comparable cases of considering or not a centered isothermal block. Results of this investigation are mainly built on parametric study of the most analytical variables that govern the flow. The buoyancy ratio ranged from -5 to 100, while Rayleigh number ranged from 103 to 106, and Lewis number ranged from 0 to 200. Four types of nanoparticles were considered: Copper, Alumina, Carbon-nanotubes and Titania which had a concentration range from 0 to 0.1.The flow is characterized by the isotherms, isoconcentrations and streamlines, and results were discussed in term of Nusselt and Sherwood average numbers, Streamlines maximum average values and Kinetic energy as function to the various aforementioned governing parameters.