Premium
Effect of hydrodynamics on reactive mixing in laminar flows
Author(s) -
Szalai E. S.,
Kukura J.,
Arratia P. E.,
Muzzio F. J.
Publication year - 2003
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690490115
Subject(s) - laminar flow , convection , mixing (physics) , chaotic mixing , chaotic , mechanics , diffusion , flow (mathematics) , convective mixing , classical mechanics , chemistry , physics , statistical physics , thermodynamics , quantum mechanics , artificial intelligence , computer science
The effects of diffusion and convection on the evolution of reactions in chaotic flows are examined. Direct numerical simulations are applied to compute the evolution of the mixing structure, describe the stretching field, and solve the convection‐reaction‐diffusion material balance in a periodic, 2‐D chaotic flow with an instantaneous, bimolecular reaction: A + B → 2P. These computations demonstrate that the location of the reactive zones in the flow can be predicted from the stretching field. The time‐evolution of the concentration profiles approaches an invariant shape when the time scale of the convective and diffusive mixing processes are comparable. Under such conditions, exponential stretching and its consequence, asymptotic directionality, are the mechanisms controlling the evolution of chaotic reactive systems.