On the analysis of flows in heated corrugated conduits

Abstract eng:
It is known that the application of periodic heating along the walls results in drag reduction in pressure-gradient driven flow. The heating creates a buoyancy field that leads to the creation of separation bubbles which separate the stream from the bounding walls. The strength of this effect is of practical interest for heating with wave numbers O(1) and for flows with small Reynolds numbers [1]. This analysis is focused on the determination of the role played by surface corrugations in a heated channel. The results suggest that a significant increase of the drag reduction can be achieved by placing the grooves in a proper relative position with respect to the heating pattern.

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