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ISSN Online: 2377-424X

ISBN Print: 0-89116-909-1

International Heat Transfer Conference 9
August, 19-24, 1990 , Jerusalem, Israel

FLOW AND MASS TRANSFER IN A CURVED WALL JET

Get access (open in a dialog) DOI: 10.1615/IHTC9.2230
pages 377-382

要約

In an extended study on Coanda flow, concentration profiles, using a tracer gas, are measured in a two dimensional curved wall jet. Two slot heights and two initial turbulence levels are examined. The measured concentration and visualization of the flow are used to infer the jet's behavior and the extent of its adherence to the wall. Photos indicate that the flow is highly turbulent; eddies of jet fluid burst out from near the wall and lumps of ambient air rush in to fill their place. Concentration measurements at the wall show that four flow regions prevail; potential core, mixing, separation and backflow regions. The turning angle of the flow is large reaching 200 degrees or more from the slot. The location of the jet's detachment varies and is affected by the jet Reynolds number. The concentration profiles change along the wall to a similar (established) distribution at downstream locations; their shape and development are affected by the initial turbulence level in the jet. Some profiles have a maximum concentration slightly above the wall, the location of which is also affected by the jet's turbulence.