Numerical analysis of fluid flow and combined natural and force convection heat transfer for nanofluid in concentric /eccentric rotating cylinders

In the present study, fluid flow and combined natural and force convection heat transfer of a nanofluid in the horizontal concentric / eccentric cylindrical with different uniform wall temperatures is numerically investigated. The force flow is induced by the cold rotating outer cylinder at slow constant angular velocity, with its axis at the center of the annulus. Moreover, in calculating the buoyancy force caused by temperature difference between annulus, used of the Boussinesq approximation. the results are presented for non-dimensional group number (Reynolds and Rayleigh (.An increase in the Rayleigh number causes non-uniformity of the flow and isothermal lines and increases the heat transfer in the walls. The highest heat transfer related to the two-phase state of non-concentric cylinders was obtained. An increase in the Rayleigh number causes non-uniformity of the flow and isothermal lines and increases the heat transfer in the walls. The highest heat transfer related to the two-phase state of non-concentric cylinders was obtained.