Deep pool water-impacts of viscous oil droplets

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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.

Original languageEnglish
Pages (from-to)4629-4638
Number of pages10
JournalSoft matter
Volume15
Issue number23
Early online date20 May 2019
DOIs
Publication statusPublished - 21 Jun 2019

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Oils
oils
craters
Water
water
liquids
Liquids
entrainment
Air entrainment
rims
inertia
Bubbles (in fluids)
bubbles
solubility
viscosity
Solubility
Viscosity
air
Air

Cite this

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Deep pool water-impacts of viscous oil droplets. / Jain, Utkarsh; Jalaal, Maziyar; Lohse, Detlef; Van Der Meer, Devaraj.

In: Soft matter, Vol. 15, No. 23, 21.06.2019, p. 4629-4638.

Research output: Contribution to journalArticleAcademicpeer-review

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