Bouncing jet: A Newtonian liquid rebounding off a free surface

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Thrasher, Matthew
Jung, Sunghwan
Pang, Yee Kwong
Chuu, Chih-Piao
Swinney, Harry L.

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We find that a liquid jet can bounce off a bath of the same liquid if the bath is moving horizontally with respect to the jet. Previous observations of jets rebounding off a bath (e.g., the Kaye effect) have been reported only for non-Newtonian fluids, while we observe bouncing jets in a variety of Newtonian fluids, including mineral oil poured by hand. A thin layer of air separates the bouncing jet from the bath, and the relative motion replenishes the film of air. Jets with one or two bounces are stable for a range of viscosity, jet flow rate and velocity, and bath velocity. The bouncing phenomenon exhibits hysteresis and multiple steady states.



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Thrasher, Matthew, Sunghwan Jung, Yee Kwong Pang, Chih-Piao Chuu, and Harry L. Swinney. "Bouncing jet: A Newtonian liquid rebounding off a free surface." Physical Review E 76, no. 5 (2007): 056319.