TWO-DIMENSIONAL JET IMPINGING ON A WALL WITH ROUGHNESS ELEMENTS

Abstract

Since a very high heat transfer coefficient can be obtained by an impinging jet in its stagnation region, this flow geometry has been used for heating, cooling, and drying in a variety of industrial applications. This high heat transfer coefficient, however, deteriorates rapidly with the streamwise distance downstream of the stagnation line, and hence the broad downstream region is targeted by the present study on heat transfer augmentation; large-scale roughness elements of a transverse repeated-rib type are mounted over the heat transfer surface. The experimental results obtained at various jet velocities indicate effective heat transfer augmentation.

Additional information

Notes on contributors

G. Miyake

G. Miyake would like to acknowledge the financial support provided by the 1986 Kawakami Memorial Foundation of Japan.