Volume 1, 2017
International Physicists' Tournament 2016
|Number of page(s)||5|
|Published online||25 August 2017|
Generation and trajectory control of water drops able to bounce on a flat water surface
Univ. Lyon, ENS de Lyon, Univ. Claude Bernard, CNRS, Laboratoire de Physique, Département de Physique,
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Accepted: 6 July 2017
Under some conditions, a water droplet can bounce on a flat water surface. This paper contains a qualitative analysis of the bouncing phenomenon that leads to try to obtain drops with a nearly tangential incidence, the smallest radius and the highest velocity possible. We describe the experimental setup that we built, able to throw unique droplets at typical speed v ~ 1 m.s−1, radius R ~ 4 × 10−4 m and impact angle θ ~ 15° with respect to the surface. Up to 4 bounces were experimentally observed. The experimental results’ plot shows the statistical behaviour of the bouncing process: the initial conditions are not sufficient to predict the trajectory and consequently the number of bounces.
Key words: bouncing water droplets / Leidenfrost slide / Weber number / superhydrophobic surface
© C. Gouiller et al., Published by EDP Sciences, 2017
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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