Satellite formation during bubble transition through an interface between immiscible liquids

Handle URI:
http://hdl.handle.net/10754/563441
Title:
Satellite formation during bubble transition through an interface between immiscible liquids
Authors:
Li, Erqiang ( 0000-0002-5003-0756 ) ; Al-Otaibi, S. A.; Vakarelski, Ivan Uriev ( 0000-0001-9244-9160 ) ; Thoroddsen, Sigurdur T. ( 0000-0001-6997-4311 )
Abstract:
When a bubble rises to an interface between two immiscible liquids, it can pass through the interface, if this is energetically favourable, i.e. The bubble preferring the side of the interface with the lower air-liquid surface tension. Once the intermediate film between the bubble and the interface has drained sufficiently, the bubble makes contact with the interface, forming a triple-line and producing strong capillary waves which travel around the bubble and can pinch off a satellite on the opposite side, akin to the dynamics in the coalescence cascade. We identify the critical Ohnesorge numbers where such satellites are produced and characterize their sizes. The total transition time scales with the bubble size and differential surface tension, while the satellite pinch-off time scales with the capillary-inertial time of the pool liquid, which originally surrounds the bubble. We also use high-speed video imaging to study the motion of the neck of the contact. For low viscosity we show that it grows in time with a power-law exponent between 0.44 and 0.50, with a prefactor modified by the net sum of the three interfacial tensions. Increasing the viscosity of the receiving liquid drop drastically slows down the motion of the triple-line, when the Ohnesorge number exceeds ${\sim }$0.08. This differs qualitatively from the coalescence of two miscible drops of different viscosities, where the lower viscosity sets the coalescence speed. We thereby propose a strong resistance from the triple-line. © 2014 Cambridge University Press.
KAUST Department:
Clean Combustion Research Center; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; High-Speed Fluids Imaging Laboratory
Publisher:
Cambridge University Press (CUP)
Journal:
Journal of Fluid Mechanics
Issue Date:
12-Mar-2014
DOI:
10.1017/jfm.2014.67
Type:
Article
ISSN:
00221120
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorLi, Erqiangen
dc.contributor.authorAl-Otaibi, S. A.en
dc.contributor.authorVakarelski, Ivan Urieven
dc.contributor.authorThoroddsen, Sigurdur T.en
dc.date.accessioned2015-08-03T11:51:34Zen
dc.date.available2015-08-03T11:51:34Zen
dc.date.issued2014-03-12en
dc.identifier.issn00221120en
dc.identifier.doi10.1017/jfm.2014.67en
dc.identifier.urihttp://hdl.handle.net/10754/563441en
dc.description.abstractWhen a bubble rises to an interface between two immiscible liquids, it can pass through the interface, if this is energetically favourable, i.e. The bubble preferring the side of the interface with the lower air-liquid surface tension. Once the intermediate film between the bubble and the interface has drained sufficiently, the bubble makes contact with the interface, forming a triple-line and producing strong capillary waves which travel around the bubble and can pinch off a satellite on the opposite side, akin to the dynamics in the coalescence cascade. We identify the critical Ohnesorge numbers where such satellites are produced and characterize their sizes. The total transition time scales with the bubble size and differential surface tension, while the satellite pinch-off time scales with the capillary-inertial time of the pool liquid, which originally surrounds the bubble. We also use high-speed video imaging to study the motion of the neck of the contact. For low viscosity we show that it grows in time with a power-law exponent between 0.44 and 0.50, with a prefactor modified by the net sum of the three interfacial tensions. Increasing the viscosity of the receiving liquid drop drastically slows down the motion of the triple-line, when the Ohnesorge number exceeds ${\sim }$0.08. This differs qualitatively from the coalescence of two miscible drops of different viscosities, where the lower viscosity sets the coalescence speed. We thereby propose a strong resistance from the triple-line. © 2014 Cambridge University Press.en
dc.publisherCambridge University Press (CUP)en
dc.subjectbreakup/coalescenceen
dc.subjectbubble dynamicsen
dc.subjectcapillary flowsen
dc.titleSatellite formation during bubble transition through an interface between immiscible liquidsen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentMechanical Engineering Programen
dc.contributor.departmentHigh-Speed Fluids Imaging Laboratoryen
dc.identifier.journalJournal of Fluid Mechanicsen
dc.contributor.institutionNorth Ghawar Producing Department, Saudi Arabian Oil Company (Saudi Aramco), Abqaiq, Saudi Arabiaen
kaust.authorLi, Erqiangen
kaust.authorVakarelski, Ivan Urieven
kaust.authorThoroddsen, Sigurdur T.en
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