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ISSN Online: 2377-424X

ISBN Print: 0-89116-299-2

International Heat Transfer Conference 7
September, 6-10, 1982, Munich, Germany

EFFECT OF A WALL JET ON THE DYNAMIC CONFIGURATION OF THE WAKE BEHIND A BACKWARD STEP IN A STEADY FLOW

Get access (open in a dialog) DOI: 10.1615/IHTC7.1730
pages 211-216

Аннотация

We study the influence of a wall jet on the dynamic configuration of the wake of a backward step making an abrupt elargment in a rectangular channel. By measurements of wall shear stress in the wake, we show how the structure of the recirculating zone and the wall reattachment region can be affected by using steady and pulsated wall jets of different mean velocities. We demonstrate that with a steady wall jet two behaviours can exist : one which presents only few modifications with regard to the configuration without wall jet and another which shows the disparition of the main eddy near the wall. On the other hand, we note that with a pulsating wall jet it is possible to obtain an early destabilization of the wake which could subsequently lead to an important increase of heat transfer in these zones.