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A study of droplet impact on static films using the BB-LIF technique

Hann, David B.; Cherdantsev, Andrey V.; Mitchell, A.; McCarthy, I.N.; Hewakandamby, Buddhika N.; Simmons, Kathy

Authors

DAVID HANN DAVID.HANN@NOTTINGHAM.AC.UK
Associate Professor

Andrey V. Cherdantsev

A. Mitchell

I.N. McCarthy



Abstract

This paper presents results of single droplet impacts on films of different height taken using the Brightness Based Laser Induced Fluorescence technique (BB-LIF). The dynamics of drop impingement such as the shape of the cavity, residual film thickness are investigated and analysed with a time-resolution of 0.1 ms and spatial resolution of 70 um. Additionally a variation of the BB-LIF technique is used to investigate the change in profile of the droplet liquid during the inertial self-similar regime. The results of the analysis show that present models predicting initial development of the cavity show good agreement. Suggested amendments for some of the constants for cavity width and residual film thickness are proposed based on the film thickness, that fit better with published data. The development of the profile of the droplet liquid demonstrates that for thin liquid films, the droplet liquid behavior with strong similarity to droplet impact on dry solid surfaces. It is noted that for some of the measured parameters, the use of the film height as the lengthscale gives a better fit.

Citation

Hann, D. B., Cherdantsev, A. V., Mitchell, A., McCarthy, I., Hewakandamby, B. N., & Simmons, K. (2016). A study of droplet impact on static films using the BB-LIF technique. Experiments in Fluids, 57(46), doi:10.1007/s00348-016-2132-x

Journal Article Type Article
Acceptance Date Jan 18, 2016
Online Publication Date Mar 16, 2016
Publication Date 2016-04
Deposit Date Mar 10, 2016
Journal Experiments in Fluids
Print ISSN 0723-4864
Electronic ISSN 1432-1114
Publisher Humana Press
Peer Reviewed Peer Reviewed
Volume 57
Issue 46
DOI https://doi.org/10.1007/s00348-016-2132-x
Keywords measurement, drop impact, imaging diagnostics, static film, laser-induced fluorescence
Public URL http://eprints.nottingham.ac.uk/id/eprint/32212
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf