Experimental evidence of reaction-driven miscible viscous fingering

Luis Atilio Riolfo, Yuichiro Nagatsu, Shuji Iwata, Renaud Maes, Philip Trevelyan, Anne De Wit

Research output: Contribution to journalArticlepeer-review


An experimental demonstration of reaction-driven viscous fingering developing when a more viscous solution of a reactant A displaces a less viscous miscible solution of another reactant B is presented. In the absence of reaction, such a displacement of one fluid by another less mobile one is classically stable. However, a simple A+ B→ C reaction can destabilize this interface if the product C is either more or less viscous than both reactant solutions. Using the pH dependence of the viscosity of some polymer solutions, we provide experimental evidence of both scenarios. We demonstrate quantitatively that reactive viscous fingering results from the buildup in time of nonmonotonic viscosity profiles with patterns behind or ahead of the reaction zone, depending on whether the product is more or less viscous than the reactants. The experimental findings are backed up by numerical simulations.
Original languageEnglish
Article number015304
Number of pages4
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Issue number1
Publication statusE-pub ahead of print - 30 Jan 2012

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Copyright © 2012 American Physical Society.


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