The influence of the entry region on the instability of a coflowing injector device. (22nd June 2018)

• Record Type: Journal Article
• Authors: Augello, L; Fani, A; Gallaire, F
• Is Part Of: Journal of physics. Volume 30:Number 28(2018)
• Publication Date: 2018-06-22
• Subjects: Rayleigh–Plateau instability -- coflowing jet -- dripping/jetting; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/aac790
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: The occurrence of dripping and jetting regimes in a microfluidic coflowing injector device has been related recently to the spatio-temporal stability properties of the developed velocity profile. Dripping corresponds to an absolutely unstable flow while jetting is observed when the Rayleigh–Plateau instability of the core-annular jet is convective. In this work we take into account the effect of the entry region on the dripping to jetting transition by carrying out a global stability analysis of the steady two-phase base flow. We show that, depending on the flow parameters, the entry region can affect significantly the transition between the two regimes.