Geometry of reaction interfaces in chaotic flows.
The analysis of transport-controlled reactions in chaotic flows provides a physical frame to extend the concept of the intermaterial contact area (ICA)--introduced in the purely kinematic case--to mixing systems with diffusion, where the ICA is identified through the reaction interface between segregated reactants. We show that the dynamics of the ICA undergoes a crossover from kinematics-dominated exponential growth to a persistent oscillatory regime resulting from the intertwined action of advection and diffusion. The scaling of the crossover length versus the Peclet number is analyzed.
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Dipartimento di Ingegneria Chimica, Centro Interuniversitario sui Sistemi Disordinati e sui Frattali nell'Ingegneria Chimica, Universitá di Roma La Sapienza, via Eudossiana 18, 00184 Roma, Italy.
Cerbelli
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Adrover
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