The influence of the entry region on the instability of a coflowing injector device

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...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2018-07, Vol.30 (28), p.284003-284003
Main Authors: Augello, L, Fani, A, Gallaire, F
Format: Article
Language:English
Subjects:
coflowing jet
dripping/jetting
Rayleigh-Plateau instability
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Summary: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.
ISSN:0953-8984
1361-648X
DOI:10.1088/1361-648X/aac790