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Experiments in Fluids

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01-05-2013 | Research Article

High velocity impingement of single droplets on a dry smooth surface

Authors: Benjamin W. Faßmann, Stephan E. Bansmer, Thorsten J. Möller, Rolf Radespiel, Michael Hartmann

Published in: Experiments in Fluids | Issue 5/2013

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Abstract

The vertical impact of single, mono disperse water droplets on a dry smooth surface was studied experimentally by means of shadowgraphy. A glass substrate was mounted on a rotating wheel to obtain high impact velocities. The droplets were generated on demand. While the Ohnesorge number was kept constant, Weber number and Reynolds number were varied by adjusting the impact velocity. In all performed experiments, splashing was observed. The distinction of the different measurement series was done by the use of the Weber number. The different Weber numbers were, 3,500, 5,000 and 10,000. Phase-locked images were taken and the temporal evolution of the impact was reconstructed by means of the nondimensional impingement time. The outcome of the measurement was analysed by digital image processing to quantify the distribution of the diameter of the resulting secondary droplets in size and time as well as their velocity, and the total deposited mass fraction remaining on the surface after the impingement. In all cases, the greater part of the impinging primary droplet remained on the substrate.

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Title: High velocity impingement of single droplets on a dry smooth surface
Authors: Benjamin W. Faßmann
Stephan E. Bansmer
Thorsten J. Möller
Rolf Radespiel
Michael Hartmann
Publication date: 01-05-2013
Publisher: Springer-Verlag
Published in: Experiments in Fluids / Issue 5/2013
Print ISSN: 0723-4864
Electronic ISSN: 1432-1114
DOI: https://doi.org/10.1007/s00348-013-1516-4

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