Abstarct: In this study, a U-shaped channel has been simulated with flat ribturbulator and a smooth U-shaped channel in Reynolds numbers 19500, 35500, 52000. Following the simulation process to improve the geometry of the flat ribturbulators, a new geometric has been created as a curved ribturbulator. that eliminates the static vortices created in the direction stream of the flat ribturbulator and prevents of the static vortices in Behind the rib. in result, it increases the amount of heat transfer from the surface of the blade. Also, the effect of channel rotation on different geometries in Reynolds numbers (19500, 35500) and Ro = 0.1 was investigated in this study. In Following the simulation process, the effect of the channel rotation in the Reynolds number of 19500 and Ro = 0, Ro=0.1, Ro = 0. 2 was investigated. The results showed that for non-rotation geometries, the geometry of the curved-shaped ribturbulator has a better heat transfer than flat ribturbulator in Ro = 0, Ro = 0.1, and Nusselt number is improved about 10%. Also, the rotational effect of Ro = 0.1 and Reynolds 19500 Leading to 20% improvement in the Nusselt number and at 35500 Reynolds, a 10% improvement in Nusselt number.