Hysteresis of the Coanda effect

[+] Author and Article Information
Aldona Skotnicka-Siepsiak

University of Warmia and Mazury in Olsztyn

1Corresponding author.

ASME doi:10.1115/1.4037522 History: Received March 10, 2017; Revised July 23, 2017


For scientist, the Coanda effect has been an object of interest for a long time. All the time, some new applications of it are found although it has been more than a hundred years since Henri Coanda got a patent that was critical for that issue. Apart from aviation, it is more and more often used in ventilation systems to control to manner of air division and to design nozzles and ventilators. It is surprising, however, that a good command of that phenomenon and a need to apply it in different solutions did not entail a significant increase of the interest in the Coanda effect hysteresis, although it was mentioned for the first time by B. G. Newman in 1961. The article below presents results of experimental measurements for a two-dimensional incompressible plane jet by an inclined plate. The hysteresis has been observed as a different jet behaviour (a free jet or a jet attached to a flat plate) depending on the direction in which the plate deflection angle changes. The observed hysteresis area, defined by critical values for the ?ca attachment and ?cd detachment angles, spanned from 8° to 14°. Its dependency on the Reynolds number has also been examined for Re ranging from 3,500 to 26,500. Considering the Coanda effect hysteresis, a pressure distribution on the plate and the xR reattachment distance have been examined. The distribution of forces on a plate has been identified, which has facilitated a graphical mirroring of the Coanda effect hysteresis loop.

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