Dynamic Interfacial Tension Effects in the Rupture of Liquid Necks

Matthieu Robert de Saint Vincent (1) , Julien Petit (1) , Mounir Aytouna (2) , Jean-Pierre Delville (1) , Daniel Bonn (2, 3) , Hamid Kellay (1)

1 LOMA - Laboratoire Ondes et Matière d'Aquitaine
2 VAN DER WAALS-ZEEMAN INSTITUTE - University of Amsterdam Van der Waals-Zeeman Institute
3 LPS - Laboratoire de Physique Statistique de l'ENS

By examining the rupture of fluid necks during droplet formation of surfactant-laden liquids, we observe deviations from expected behaviour for the pinch-off of such necks. We suggest that these deviations are due to the presence of a dynamic (time-varying) interfacial tension at the minimum neck location and extract this quantity from our measurements on a variety of systems. The presence of such dynamic interfacial tension effects should change the rupture process drastically. However, our measurements show that a simple ansatz, which incorporates the temporal change of the interfacial tension, allows us to understand the dynamics of thinning. This shows that this dynamics is largely independent of the exact details of what happens far from the breakup location, pointing to the local nature of the thinning dynamics.

Mots clés: breakup/coalescence; liquid bridges

Domaines: Matière Molle [cond-mat.soft]; Dynamique des Fluides [physics.flu-dyn]

Matthieu Robert de Saint Vincent, Julien Petit, Mounir Aytouna, Jean-Pierre Delville, Daniel Bonn, et al.. Dynamic Interfacial Tension Effects in the Rupture of Liquid Necks. Journal of Fluid Mechanics, 2012, 692, pp.499-510. ⟨10.1017/jfm.2011.550⟩. ⟨hal-00677245⟩