Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session G18: Drops: Sessile and Static Surface Interactions
3:00 PM–3:52 PM,
Sunday, November 19, 2023
Room: 146A
Chair: Marc Pradas, Open University
Abstract: G18.00002 : Blooming of Emulsion Droplet During Evaporation*
3:13 PM–3:26 PM
Presenter:
Teng Dong
(ThAMeS Multiphase, Department of Chemical Engineering, University College London, London WC1E 7JE, UK)
Authors:
Teng Dong
(ThAMeS Multiphase, Department of Chemical Engineering, University College London, London WC1E 7JE, UK)
Kristo Kotsi
(ThAMeS Multiphase, Department of Chemical Engineering, University College London, London WC1E 7JE, UK)
Takeshi Tobayashi
(Department of Chemical Engineering, University College London, London WC1E 7JE, UK)
Alexander Moriarty
(Department of Chemical Engineering, University College London, London WC1E 7JE, UK)
Ian McRobbie
(Innospec Ltd, Oil Sites Road, Ellesmere Port, Cheshire CH65 4EY, UK.)
Alberto Striolo
(School of Chemical, Biological and Materials Engineering, University of Oklahoma, Norman OK 73019, USA)
Panagiota Angeli
(ThAMeS Multiphase, Department of Chemical Engineering, University College London, London WC1E 7JE, UK)
During the evaporation, the dispersed microdroplets close to the contact edge were found to coalesce and form a continuous phase that tended to spread out. The characteristics of the spreading film were influenced by the wettability of the solid surface. On hydrophilic surfaces a distinctive multi-layer structure emerged, featuring flower-like patterns. The spreading film was found to follow the law of r~t1/3, where r is the contact radius of the film. This is much faster than the predictions of the well-known Tanner’s law. The fast spreading of the film is attributed to the strong slip and the disjoining pressure that dominates the spreading of the thin film front.
*This work was funded by EPSRC. Teng Dong acknowledges the partial financial support of the CSC program.
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