Dong, Teng;
Angeli, Panagiota;
(2023)
Pinching Dynamics and Multiple Droplet Generation in Partial Coalescence.
Physical Review Letters
, 131
(10)
, Article 104001. 10.1103/physrevlett.131.104001.
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Abstract
When a drop merges with its homophase, a liquid cylinder appears in certain conditions, which is pinched off leading to partial coalescence. We investigate the process experimentally and numerically, and find that the Rayleigth-Plateau instability is able to pinch off the cylinder when its height-to-neck ratio exceeds one. Surfactants are found to attenuate the cylinder and produce multiple droplets at moderate concentrations. For both the pinch-off of the mother drop and the subsequent breakup of the liquid threads in partial coalescence, the neck thinning is initially in the inertial (I) regime and then shifts to the inertial-viscous (IV) regime. An intermediate regime is seen at larger surfactant concentrations, which accelerates the thinning and favours the generation of multiple droplets.
| Type: | Article |
|---|---|
| Title: | Pinching Dynamics and Multiple Droplet Generation in Partial Coalescence |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/physrevlett.131.104001 |
| Publisher version: | https://doi.org/10.1103/PhysRevLett.131.104001 |
| Language: | English |
| Additional information: | Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10177007 |
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