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Accueil du site > Publications > Archives 2004-2010 > 2007 > Stability of a Jet in Confined Pressure-Driven Biphasic Flows at Low Reynolds Numbers

Stability of a Jet in Confined Pressure-Driven Biphasic Flows at Low Reynolds Numbers

P. Guillot, A. Colin, A. S. Utada, and A. Ajdari — Phys. Rev. Lett. 99, 104502 (2007)

27 septembre 2007

Motivated by its importance for microfluidic applications, we study the stability of jets formed by pressure-driven concentric biphasic flows in cylindrical capillaries. The specificity of this variant of the classical Rayleigh-Plateau instability is the role of the geometry which imposes confinement and Poiseuille flow profiles. We experimentally evidence a transition between situations where the flow takes the form of a jet and regimes where drops are produced. We describe this as the transition from convective to absolute instability, within a simple linear analysis using lubrication theory for flows at low Reynolds number, and reach remarkable agreement with the data.

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