Abstract
A numerical study is performed to investigate heat transfer and fluid flow in the hydrodynamically and thermally fully-developed region of an annulus, consisting of a heated
rotating inner cylinder and a stationary insulated outer cylinder. Emphasis is placed on the
effect of rotation of an inner core on the flow structure and the thermal field. A Reynolds
stress turbulence model is employed to determine three normal components of the Reynolds stress and its off-diagonal one. The turbulent heat flux is expressed by Boussinesq approximation in which the eddy diffusivity.for heat is given as functions of the temperature variance