EFFECT OF HEAT-FLUX BOUNDARY ON BUOYANCY-DRIVEN FLOW IN A TWO-DIMENSIONAL SQUARE-ENCLOSURE UTILIZING Cu-H_2O NANO-FLUID

摘要

A numerical investigation of buoyancy-driven flow in a two-dimensional square enclosure filled with Cu-H_2O nanofluid has been studied. On one wall heat flux boundary and on the other three walls convective boundary conditions have been conducted. Different pertinent parameters of the present study are Grashof number (5×10~5) and solid nanoparticle concentration φ (varying up to 8%) and inclination angles λ. Prandtl number for water has been kept to a constant value of (Pr =6.49). Results shows that fluid flow is very sensitive to the inclination angles values, mild conduction has been observed when heat flux is at the top wall, while an extra rolls at the bottom corner of the enclosure has been found for 37° inclination angle. Addition of nano-particle in the base-fluid is not showing any changes in the flow patterns and temperature and velocity profiles. Nusselt number is also found to be decreasing with particle concentration values.