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From droplets to waves: periodic instability patterns in highly viscous microfluidic flows

Published online by Cambridge University Press:  28 January 2020

Xiaoyi Hu Open the ORCID record for Xiaoyi Hu [Opens in a new window]  and
Thomas Cubaud Open the ORCID record for Thomas Cubaud [Opens in a new window]
Xiaoyi Hu
Affiliation:
Department of Mechanical Engineering, Stony Brook University, Stony Brook, NY11794, USA
Thomas Cubaud*
Affiliation:
Department of Mechanical Engineering, Stony Brook University, Stony Brook, NY11794, USA
*
†Email address for correspondence: [email protected]
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Abstract

We experimentally study the transition from droplet to wave regimes in microfluidic liquid–liquid multiphase flows having large differences in viscosity. A unified approach based on periodic pattern analysis is employed to study relationships between dispersed and separated flow regimes, including dripping, jetting, capillary waves, inertial waves and core–annular flows over a wide range of flow rates and viscosity contrasts. We examine the morphology and dynamics of each flow regime based on wavelength, frequency and velocity of repeating unit cells to elucidate their connections and to develop predictive capabilities based on dimensionless control parameters. We demonstrate in particular that pattern selection is contingent upon the propagation velocity of droplets and waves at the transition. We also investigate microfluidic wave breaking phenomena with the formation of ligaments and droplets from wave crests in both capillary and inertial wave regimes. This work expands conventional multiphase flow regimes observed in microchannels and shows new routes to disperse highly viscous materials using interfacial waves dynamics in confined microsystems.

JFM classification

Drops and Bubbles: Drops Micro-/Nano-fluid dynamics: Microfluidics
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 887 , 25 March 2020 , A27
Copyright
© 2020 Cambridge University Press

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