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Experiments on chaotic mixing in a screw channel flow
Author(s) -
Hwang W. R.,
Jun H. S.,
Kwon T. H.
Publication year - 2002
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.690480805
Subject(s) - mixing (physics) , mechanics , chaotic mixing , chaotic , flow (mathematics) , torus , invariant (physics) , physics , geometry , mathematics , quantum mechanics , artificial intelligence , computer science
Mixing patterns of a passive dye were investigated experimentally in an unwound screw channel flow with periodic barriers that serve to induce a chaotic flow. Continuous cross‐sectional and longitudinal mixing patterns were observed as a function of the barrier fraction and were interpreted in terms of dynamical systems theory, along with 3‐D numerical simulations. Observations include: periodically invariant cross‐sectional mixing patterns due to the resonance bands; pile‐up of dye streaks caused by stretching and folding of manifolds near hyperbolic points; unmixed zones due to KAM tori; longitudinal deformation patterns with exit time distributions; and effects of the barrier fraction on the size of unmixed islands, the thickness of the band of dye streaks, and the distribution of exit times.