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Delayed coalescence of droplets with miscible liquids: Lubrication and phase field theories

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Karpitschka,  Stefan
Group Fluidics in heterogeneous environments, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Citation

Borcia, R., Menzel, S., Bestehorn, M., Karpitschka, S., & Riegler, H. (2011). Delayed coalescence of droplets with miscible liquids: Lubrication and phase field theories. The European Physical Journal E, 34: 24. doi:10.1140/epje/i2011-11024-9.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-D5E6-4
Abstract
Mixing of droplets with a body of different liquids shows an interesting behavior for small contact angles at solid substrate. The droplets interact with each other, a liquid exchange appears between the approaching drops owing to surface tension gradients at the droplets interface. But the drops remain separated for some seconds (up to minutes), until the merging into a single drop occurs (Langmuir 24, 6395 (2008)). We investigate this phenomenon using lubrication approximation and phase field approach. For both methods, 2D quantitative computer simulations for delayed fusion of perfectly miscible thin liquid films/droplets with low contact angles are reported.