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Study of the impacts of droplets deposited from the gas core onto a gas-sheared liquid film

Cherdantsev, Andrey V.; Hann, David B.; Hewakandamby, Buddhika N.; Azzopardi, Barry J.

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Authors

Andrey V. Cherdantsev

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

Barry J. Azzopardi



Abstract

The results of an experimental study on droplet impactions in the flow of a gas-sheared liquid film are presented. In contrast to most similar studies, the impacting droplets were entrained from film surface by the gas stream. The measurements provide film thickness data, resolved in both longitudinal and transverse coordinates and in time together with the images of droplets above the interface and images of gas bubbles entrapped by liquid film. The parameters of impacting droplets were measured together with the local liquid film thickness. Two main scenarios of droplet-film interaction, based on type of film perturbation, are identified; the parameter identifying which scenario occurs is identified as the angle of impingement. At large angles an asymmetric crater appears on film surface; at shallow angles a long, narrow furrow appears. The most significant difference between the two scenarios is related to possible impact outcome: craters may lead to creation secondary droplets, whereas furrows are accompanied by entrapment of gas bubbles into the liquid film. In addition, occurrence of partial survival of impacting droplet is reported.

Citation

Cherdantsev, A. V., Hann, D. B., Hewakandamby, B. N., & Azzopardi, B. J. (2017). Study of the impacts of droplets deposited from the gas core onto a gas-sheared liquid film. International Journal of Multiphase Flow, 88, 69-86. https://doi.org/10.1016/j.ijmultiphaseflow.2016.09.015

Journal Article Type Article
Acceptance Date Sep 7, 2016
Online Publication Date Oct 1, 2016
Publication Date 2017-01
Deposit Date Nov 25, 2016
Publicly Available Date Nov 25, 2016
Journal International Journal of Multiphase Flow
Print ISSN 0301-9322
Electronic ISSN 1879-3533
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 88
Pages 69-86
DOI https://doi.org/10.1016/j.ijmultiphaseflow.2016.09.015
Keywords Gas-sheared liquid film; Droplet entrainment; Droplet deposition; Droplet impact; Disturbance waves; Laser-induced fluorescence
Public URL https://nottingham-repository.worktribe.com/output/807803
Publisher URL http://www.sciencedirect.com/science/article/pii/S030193221630057X
Contract Date Nov 25, 2016

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