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Updated: Jun 5, 2026

Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure
Published on: April 17, 2018
Suppression of viscous fluid fingering: a piecewise-constant injection process
Eduardo O Dias1, Fernando Parisio, José A Miranda
1Departamento de Física, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil.
Abstract:
The injection of a fluid into another of larger viscosity in a Hele-Shaw cell usually results in the formation of highly branched patterns. Despite the richness of these structures, in many practical situations such convoluted shapes are quite undesirable. In this Brief Report, we propose an efficient and easily reproducible way to restrain these instabilities based on a simple piecewise-constant pumping protocol. It results in a reduction in the size of the viscous fingers by one order of magnitude.
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