コリオリの力の作用する凸面上の乱流境界層

抄録

Effects of the centrifugal force by streamline curvature and the Coriolis force by system rotation on a turbulent boundary layer along a convex surface are studied experimentally using a curved rectangular channel which rotates about an axis perpendicular to the main flow. In addition to the stabilizing effects due to the streamline curvature, system rotation has a large effect on the stabilization or destabilization of turbulent motion in the boundary layer. The flow tends to be laminarized in the suction side due to the stabilizing effects of both system rotation and surface curvature. The Monin-Oboukhov formula modified for the curved rotating channel does not hold for the boundary layers on the convex surface. Experimental results are also compared with those on the concave surface of the same channel.