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The impact of a translating plunging jet on a pool of the same liquid

Published online by Cambridge University Press:  26 April 2011

R. GÓMEZ-LEDESMA ,
K. T. KIGER  and
J. H. DUNCAN
R. GÓMEZ-LEDESMA
Affiliation:
Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA
K. T. KIGER*
Affiliation:
Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA
J. H. DUNCAN
Affiliation:
Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA
*
‡Email address for correspondence: [email protected]
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Abstract

An experimental study on the impact of a translating two-dimensional transient jet on an initially quiescent liquid pool is studied experimentally using high-speed cinematic visualization and particle image velocimetry methods. Six jet conditions (covering a range of jet thicknesses, velocities and inclination angles relative to vertical) are considered, with measurements performed over a range of horizontal translation speeds for each jet condition. For all conditions studied herein, the jet penetrates into the pool and forms two craters – one upstream and one downstream of the jet. Gravity acts to close these craters, which after a short time pinch off at intermediate depths, thereby entrapping cavities of air. The translation speed of the jet is found to have a dramatic effect on the cavity shapes, pinch-off depths and pinch-off times. A simple theory based on a potential flow and a hydrostatically driven collapse is used to model this flow, and the resulting jet tip trajectories and cavity shapes compare favourably with the experimental data.

JFM classification

Geophysical and Geological Flows: Air/sea interactions Drops and Bubbles: Bubble dynamics
Type
Papers
Information
Journal of Fluid Mechanics , Volume 680 , 10 August 2011 , pp. 5 - 30
Copyright
Copyright © Cambridge University Press 2011

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Footnotes

Present address: Boeing Research and Technology Europe, Cañada Real de las Merinas 1-3, Building 4, 4th floor, 28042 Madrid, Spain.

References

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