Delayed coalescence of droplets with miscible liquids: Lubrication and phase field theories
Lehrstuhl Statistische Physik/Nichtlineare Dynamik, Brandenburgische Technische Universität, D-03046, Cottbus, Germany
2 Max-Planck-Institut für Kolloid und Grenzflächenforschung, Am Mühlenberg, D-14476, Potsdam, Germany
Accepted: 26 January 2011
Published online: 7 March 2011
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.
© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg, 2011