numerical study of mixed convection in a lid-driven enclosure with a centered body using nanofluid variable properties

in the present study, mixed convection laminar flow around an adiabatic body in a lid-driven enclosure filled with nanofluid using variable thermal conductivity and variable viscosity is numerically investigated. the fluid around the body in the enclosure is a water-based nanofluid containing al2o3 nanoparticles. the vertical enclosure’s walls are maintained at constant cold temperature and the horizontal bottom enclosure’s wall is kept constant at hot temperature. top enclosure’s wall is insulated and moving with uniform velocity. the ratio of body’s length to enclosure’s length is kept constant at 1/3. the study has been carried out for the richardson number of 0.01 to 100, the solid volume fraction of 0 to 0.06 and the grashof number of 104. various results for the streamlines and isotherms as well as the local and average nusselt numbers are presented. by the use of variable properties in this study interesting results are observed.