A Numerical Study of 2-D Convective Heat Transfer of Nanofluid (Al2O3/H2O) in a Lid Driven Cavity with Square Cylinder at the Centre

The mixed convective heat transfer of a nanofluid based on Al2O3 and water in an enclosed cavity is investigated numerically. The enclosure contains a heated square block at the center. The effect of the concentration of nanoparticles are studied with volume concentration varies from 1, 2, 3, 4 and 5 % each at given low Reynolds number of 1, 10 and 100. The top wall is considered to be moving at a uniform speed while other walls of the cavity are assumed to be stationary. The square block is assumed to have a given constant high temperature and it is also stationary. The thermal boundary condition of the top moving wall is assumed to be isothermal with a given low temperature, while all other walls of the enclosure are assumed to be adiabatic. The Grashof number in this simulation is kept constant at 10(4). It has been found that the heat transport of the cavity increases with increasing concentration. But decreases from Reynolds number 1 to 10. Finally increased with relatively higher Reynolds number of 100. (C) 2019 Elsevier Ltd. All rights reserved.