Abstract
We experimentally study the impacts of viscous, immiscible oil drops into a deep pool of water. Within the target liquid pool, the impacting drop creates a crater, whose dynamics are studied. It is found that the inertia of pool liquid and drop viscosity are the main factors that determine the crater's maximum depth, while the additional factor of mutual immiscibility between the drop and pool liquids leads to interesting interfacial dynamics along the oil-water interface. We discuss how this can change the crater dynamics in its retraction phase, making possible a type of double-entrainment, whereby a tiny air bubble is entrapped inside a water-entrained oil drop. Further, we report the observation of a type of 'fingering' that occurs along the oil-drop rim, which we discuss, arises as a remnant of the well-known crown-splash instability.
Highlights
Drop impacts on a deep pool of liquid[1,2,3,4,5,6] and on different types of solid substrates[7,8,9] have been an active subject of research for a long time
Throughout the study, the target pool consisted of purified water, whereas the drop liquid was changed to study the effect of drop viscosity on crater dynamics
We reported the results from experiments studying the impacts of viscous immiscible oil drop on a deep pool of water
Summary
Drop impacts on a deep pool of liquid[1,2,3,4,5,6] and on different types of solid substrates[7,8,9] have been an active subject of research for a long time This finds its place in a wider tradition of the work on water entry comprehensively covered by Truscott et al.[10] Drop impact studies differ from solid projectile impacts in that, in the former, the impacting projectile is deformable, which has become of interest as evidenced by recent works of Hurd et al.[11] and Jalaal et al.[12].
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