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Ejecta evolution during cone impact

Published online by Cambridge University Press:  07 July 2014

J. O. Marston  and
S. T. Thoroddsen
J. O. Marston*
Affiliation:
Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
S. T. Thoroddsen
Affiliation:
Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia Clean Combustion Research Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
*
†Present address: Department of Chemical Engineering, Texas Tech University, Lubbock, TX 79409-3121, USA. Email address for correspondence: jeremy.marston@kaust.edu.sa
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Abstract

We present findings from an experimental investigation into the impact of solid cone-shaped bodies onto liquid pools. Using a variety of cone angles and liquid physical properties, we show that the ejecta formed during the impact exhibits self-similarity for all impact speeds for very low surface tension liquids, whilst for high-surface tension liquids similarity is only achieved at high impact speeds. We find that the ejecta tip can detach from the cone and that this phenomenon can be attributed to the air entrainment phenomenon. We analyse of a range of cone angles, including some ogive cones, and impact speeds in terms of the spatiotemporal evolution of the ejecta tip. Using superhydrophobic cones, we also examine the entry of cones which entrain an air layer.

JFM classification

Interfacial Flows (free surface): Contact lines Interfacial Flows (free surface): Interfacial Flows (free surface) Wakes/Jets: Jets
Type
Papers
Information
Journal of Fluid Mechanics , Volume 752 , 10 August 2014 , pp. 410 - 438
Copyright
© 2014 Cambridge University Press 

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Marston and Thoroddsen supplementary movie

Video of a 45 degree cone impacting onto water at 1.36 m/s.

Download Marston and Thoroddsen supplementary movie(Video)
Video 101.6 KB

Marston and Thoroddsen supplementary movie

Video of a 45 degree cone impacting onto perfluorohexane at 4.24 m/s. Note the detachment of the eject tip and ensuing instability.

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Video 109.1 KB

Marston and Thoroddsen supplementary movie

Video of the break-up of the entrained air layer for a 39 degree cone, half-coated with a hydrophobic agent. The impact speed is 3.6 m/s.

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Video 216.3 KB

Marston and Thoroddsen supplementary movie

Video showing the early ejecta detachment - i.e. impact jetting. The cone angle is 132 degrees and the impact speed is 4.55 m/s

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Video 33.6 KB