Slip Velocity and Temperature Jump in Flow over Rough Surface
The expressions for the slip velocity and the temperature jump are determined and used as the boundary conditions in the calculation of turbulent flow over rough surfaces. The slip velocity is related with the drag force exerted on the roughness elements, and the temperature jump with the local heat transfer rate around the roughness. Comparing with the classical method, the new calculation method gives a more accurate representation of the velocity and the temperature distributions near the wall. The friction factor and the Stanton number obtained using the new method are found to be more consistent with experimental data.