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Article: Pinch-off of microfluidic droplets with oscillatory velocity of inner phase flow

TitlePinch-off of microfluidic droplets with oscillatory velocity of inner phase flow
Authors
Keywordsacceleration
behavior
liquid
neck
oscillation
Issue Date2016
PublisherNature Research (part of Springer Nature): Fully open access journals. The Journal's web site is located at http://www.nature.com/srep/index.html
Citation
Scientific Reports, 2016, v. 6, p. article no. 31436 How to Cite?
AbstractWhen one liquid is introduced into another immiscible one, it ultimately fragments due to hydrodynamic instability. In contrast to neck pinch-off without external actuation, the viscous two-fluid system subjected to an oscillatory flow demonstrates higher efficiency in breaking fluid threads. However, the underlying dynamics of this process is less well understood. Here we show that the neck-thinning rate is accelerated by the amplitude of oscillation. By simply evaluating the momentum transfer from external actuation, we derive a dimensionless pre-factor to quantify the accelerated pinch-off. Our data ascribes the acceleration to the non-negligible inner fluid inertia, which neutralizes the inner phase viscous stress that retards the pinch-off. Moreover, we characterize an equivalent neck-thinning behavior between an actuated system and its unactuated counterpart with decreased viscosity ratio. Finally, we demonstrate that oscillation is capable of modulating satellite droplet formation by shifting the pinch-off location. Our study would be useful for manipulating fluids at microscale by external forcing.
Persistent Identifierhttp://hdl.handle.net/10722/272918
ISSN
2017 Impact Factor: 4.122
2015 SCImago Journal Rankings: 2.073
PubMed Central ID

 

DC FieldValueLanguage
dc.contributor.authorZhu, P-
dc.contributor.authorTang, X-
dc.contributor.authorTian, Y-
dc.contributor.authorWang, L-
dc.date.accessioned2019-08-06T09:19:02Z-
dc.date.available2019-08-06T09:19:02Z-
dc.date.issued2016-
dc.identifier.citationScientific Reports, 2016, v. 6, p. article no. 31436-
dc.identifier.issn2045-2322-
dc.identifier.urihttp://hdl.handle.net/10722/272918-
dc.description.abstractWhen one liquid is introduced into another immiscible one, it ultimately fragments due to hydrodynamic instability. In contrast to neck pinch-off without external actuation, the viscous two-fluid system subjected to an oscillatory flow demonstrates higher efficiency in breaking fluid threads. However, the underlying dynamics of this process is less well understood. Here we show that the neck-thinning rate is accelerated by the amplitude of oscillation. By simply evaluating the momentum transfer from external actuation, we derive a dimensionless pre-factor to quantify the accelerated pinch-off. Our data ascribes the acceleration to the non-negligible inner fluid inertia, which neutralizes the inner phase viscous stress that retards the pinch-off. Moreover, we characterize an equivalent neck-thinning behavior between an actuated system and its unactuated counterpart with decreased viscosity ratio. Finally, we demonstrate that oscillation is capable of modulating satellite droplet formation by shifting the pinch-off location. Our study would be useful for manipulating fluids at microscale by external forcing.-
dc.languageeng-
dc.publisherNature Research (part of Springer Nature): Fully open access journals. The Journal's web site is located at http://www.nature.com/srep/index.html-
dc.relation.ispartofScientific Reports-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectacceleration-
dc.subjectbehavior-
dc.subjectliquid-
dc.subjectneck-
dc.subjectoscillation-
dc.titlePinch-off of microfluidic droplets with oscillatory velocity of inner phase flow-
dc.typeArticle-
dc.identifier.emailWang, L: lqwang@hku.hk-
dc.identifier.authorityWang, L=rp00184-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1038/srep31436-
dc.identifier.pmid27511300-
dc.identifier.pmcidPMC4980598-
dc.identifier.scopuseid_2-s2.0-84982082402-
dc.identifier.hkuros300436-
dc.identifier.volume6-
dc.identifier.spagearticle no. 31436-
dc.identifier.epagearticle no. 31436-
dc.publisher.placeUnited Kingdom-

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