Effects of curvature variations in a transitional boundary layer on heat transfer

Abstract eng:
It is known that the boundary layer over concave surfaces can be unstable to centrifugal forces, giving rise to counter-rotating vortices, aligned in the streamwise direction. The effects caused by these vortices distort the hydrodynamic and thermal boundary layer profiles, and they may modify the heat transfer rates. Results of a numerical investigation of the effects of Goertler vortices on heat transfer enhancement from a boundary layer flow over walls of variable curvature are reported. Fully concave, concave-flat and concave-convex configurations are considered. The results provide evidence that one may effectively decrease heat transfer rates of a transitional flow by changing curvature.

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