抄録
In the present study the velocity and turbulent intensity are measured near the concave surface in channels whose radii of center line curvature are 1,000mm and 2,000mm, respectively, on the rotating system. When the channel rotates in such direction as the Coriolis force acts toward the wall, the transition of the boundary layer to the turbulent state is promoted because the Gortler instability is enhanced. For the prediction of the boundary layer transition, Gortler number can be an appropriate parameter because the transition occurs at the point where Gortler number exceeds 7, irrespective of the axial Reynolds number, rotation rate, or curvature radius of the wall.
