Natural convection analysis employing entropy generation and heat line visualization in a hollow L-shaped cavity filled with Nano fluid using lattice Boltzmann method- Experimental thermo-physical properties

Abstract

The natural convection heat transfer and fluid flow is analyzed using lattice Boltzmann numerical method. The The entropy generation analysis and heat line visualization are used to study the convective flow field comprehensively.The hollow L-shaped cavity is considered and filled with SiO2-TiO2/Water-EG(60:40) hybrid nanofluid. The thermal conductivity and dynamic viscosity of nanofluid are measured experimentally. To use the experimental data of thermal conductivity and dynamic viscosity, two sets of correlations based on temperature for six different solid volume fractions of 0.5,1,1.5,2,2.5 and 3vol% are derived. The influences of different governing parameters such different aspect ratios, solid volume fractions of nanofluid and Rayleigh numbers on the fluid flow, temperature filed, average/local Nusseltnumber, total/local entropy generation and heat lines are presented