https://doi.org/10.1140/epjst/e2020-900269-5
Regular Article
Interaction between an aerodynamically driven, wall-bound drop and a single groove
Institute of Fluid Mechanics and Aerodynamics, Technische Universität Darmstadt,
Darmstadt, Germany
a e-mail: roisman@sla.tu-darmstadt.de
Received:
29
November
2019
Accepted:
6
July
2020
Published online: 14 September 2020
The interaction between an air-driven, wall-bound drop and a groove in the wall of a channel flow has been investigated experimentally using a high-speed video system. Three major outcomes of drop interaction with the groove are observed: (i) the drop passes over the groove, (ii) the drop is immediately fully captured in the groove or (iii) the drop is captured after first wetting the rear side of the groove. The mechanisms leading to these different outcomes are governed by the aerodynamic drag force, by inertial and gravity forces, and by the adhesion force associated with the substrate wettability. A threshold condition for drop capture is developed, based on the ratio of the typical time for drop passage over the groove to the time for the drop to be sucked into the groove. It has been shown that the probability for drop capture increases for higher Bond numbers.
© The Author(s) 2020
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.
Open access funding provided by Projekt DEAL.
