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No Access Submitted: 10 May 2016 Accepted: 08 September 2016 Published Online: 18 October 2016

  • Puddle jumping: Spontaneous ejection of large liquid droplets from hydrophobic surfaces during drop tower tests
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Physics of Fluids 28, 102104 (2016); https://doi.org/10.1063/1.4963686
B. Attari1, M. Weislogel1,a), A. Wollman1, Y. Chen1, and T. Snyder2
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  • B. Attari
  • M. Weislogel
  • A. Wollman
  • Y. Chen
  • T. Snyder
ABSTRACT
Large droplets and puddles jump spontaneously from sufficiently hydrophobic surfaces during routine drop tower tests. The simple low-cost passive mechanism can in turn be used as an experimental device to investigate dynamic droplet phenomena for drops up to 104 times larger than their normal terrestrial counterparts. We provide and/or confirm quick and qualitative design guides for such “drop shooters” as employed in drop tower tests including relationships to predict droplet ejection durations and velocities as functions of drop volume, surface texture, surface contour, wettability pattern, and fluid properties including contact angle. The latter is determined via profile image comparisons with numerical equilibrium interface computations. Water drop volumes of 0.04–400 ml at ejection speeds of −0.007–0.12 m/s are demonstrated herein. A sample application of the drop jump method is made to the classic problem of low-gravity phase change heat transfer for large impinging drops. Many other candidate problems might be identified by the reader.

Acknowledgments

This work was completed in part under the support of NASA Cooperative Agreement No. NNX12AO47A, the Xerox Foundation, 3D Systems, Inc., and with significant experimental support from Portland State University MCECS B.S.M.E. students L. Torres, J. Smith, K. Cardin, and J. Luce.

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  1. © 2016 Author(s). Published by AIP Publishing.

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