la8b03724_si_006.mpg (3.38 MB)
Coexistence and Sudden Entrapment between Two Dissimilar, Miscible Oil Lenses
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posted on 2019-01-07, 00:00 authored by Wei Sun, Qingyuan Ren, Zelin Wang, Fuqian YangThe property of substrates
is one of the important factors determining
the interaction between two lenses (droplets). There likely exist
different interactions between two dissimilar oil lenses (droplets)
floating on the surface of a liquid phase from the interaction between
two dissimilar oil droplets on a rigid substrate, for example, coalescence
or coexistence. The interaction between two dissimilar oil lenses
(droplets) is dependent on the intrinsic properties of both oil lenses
(droplets) and external environmental factors. In this work, we investigate
the contact interaction between two dissimilar, miscible oil lenses
(toluene and silicone oil) on the surface of deionized water (DI water).
The morphological evolution of two dissimilar, miscible oil lenses
during the interaction under different experimental conditions is
recorded and analyzed. The effects of the volume ratio of two dissimilar,
miscible oil lenses, temperature of DI water, and viscosity of silicone
oil on characteristic parameters are systematically studied. A sudden
“entrapment”
of a toluene lens into a silicone oil lens occurs after a period of
the “mass exchange” (coexistence) between these two
oil lenses. Several characteristic parameters, including the duration
of the “mass exchange” and critical sizes of the toluene
lens at the onset of the entrapment and after the entrapment, are
found to be dependent on experimental conditions.