NDLI: Capillary contributions to the dynamics of discrete slugs in microchannels

Content Provider	Springer Nature Link
Author	Ody, Cédric P.
Copyright Year	2009
Abstract	The dynamics of discrete slugs made of perfectly or partially wetting liquids is studied experimentally in microchannels with rectangular cross-sections. Two contributions to the applied pressure drop govern the observed steady motions during which the length and the speed of a slug remain constant. The first contribution is the viscous dissipation in the liquid column between the menisci of the slug and is approximated by the Hagen–Poiseuille’s law. The second contribution arises at the vicinity of the menisci and is deduced from the experimental data. Distinct regimes are observed for this contribution depending on the wetting properties of the liquid and on the capillary number Ca. In the dynamic regime, a typical visco-capillary scaling in Ca 2/3 is found for the wetting liquid whereas the contribution of the menisci in partial wetting tends towards the previous scaling as the capillary number increases. A quasi-static regime is observed in partial wetting at low driving pressures and the capillary number increases exponentially. This observation suggests the influence of friction on the motion of the contact line and leads us to discuss its effects in the dynamic regime. In particular, experimental results are compared to an empirical prediction involving the previous mechanism as well as dynamic contact angles.
Starting Page	397
Ending Page	410
Page Count	14
File Format	PDF
ISSN	16134982
Journal	Microfluidics and Nanofluidics
Volume Number	9
Issue Number	2-3
e-ISSN	16134990
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-12-29
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Slug Plug Two-phase flow Microchannel Wetting Contact angle Contact line Pinning Friction Biomedical Engineering Engineering Fluid Dynamics
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Materials Chemistry Condensed Matter Physics Electronic, Optical and Magnetic Materials

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