Using acoustics to study and stimulate the coalescence of oil drops surrounded by water

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Abstract

The coalescence of oil drops in water is studied using acoustic levitation and stimulated with acoustic cavitation. Unlike most earlier studies, which investigate the coalescence of a single drop with an initially plannar interface, the use of acoustic radiation forces allows two drops to be brought into contact and allowed to coalesce. This acoustic technique has the advantage over other drop-drop coalescence systems in that the drops remain in contact until they coalesce without the use of solid supports to control them. Additionally, acoustic cavitation is observed to deposit sufficient energy in the oil-water interface to trigger the coalescence of a pair of 2-mm-diameter drops. This stimulation mechanism could have application to emulsion breaking. Some of the factors that affect spontaneous and stimulated coalescence are investigated. © 1993 Academic Press, Inc.

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Gardner, E. A., & Apfel, R. E. (1993). Using acoustics to study and stimulate the coalescence of oil drops surrounded by water. Journal of Colloid And Interface Science, 159(1), 226–237. https://doi.org/10.1006/jcis.1993.1316

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