The effect of insert tube on hydrodynamic and thermal performance of Newtonian and non-Newtonian fluid

The incompressible Newtonian and non-Newtonian fluid flow in a tube with disk insert is studied numerically using finite volume and boundary fitted coordinate method. The non-Newtonian fluid is time independent purely viscous that is simulated by the power law model. The effects of power law index، thickness، aspect ratio، Prandtl number and the distance between insert tubes on heat transfer، pressure drop and overall enhancement ratio (OER) are investigated for the Reynolds numbers 500، 1000 and 1500. The results show that the effect of power law index on pressure drop and overall enhancement ratio is more than the other parameters.