An experimental study of flow in the Whirlpool, Niagara River, New York - Ontario, USA - Canada
Warren, Steven J.
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Under low-flow conditions, circulation in the Niagara Whirlpool changes from counterclockwise to clockwise. An experimental tank was built to test a hydrodynamic hypothesis for cause of the reversal. The Coanda effect directs high-speed jets in confined basins towards a boundary, due to the lack of available fluid for entrainment. Through particle imagery velocimetry (PIV) experimentation, no evidence was found supporting a jet deflection hypothesis for the Whirlpool reversal. Further investigation is needed to determine if the Coanda effect occurs in three-dimensional basins over a wider range of experimental conditions.