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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/5257

Title: Chaotic mixing in a bounded three-dimensional flow
Authors: FOUNTAIN, GO
KHAKHAR, DV
MEZIC, I
OTTINO, JM
Keywords: volume-preserving flows
stokes flows
2-dimensional maps
transfer enhancement
laminar-flow
transport
streamlines
advection
steady
symmetry
Issue Date: 2000
Publisher: CAMBRIDGE UNIV PRESS
Citation: JOURNAL OF FLUID MECHANICS, 417(), 265-301
Abstract: Even though the first theoretical example of chaotic advection was a three-dimensional flow (HE:non 1966), the number of theoretical studies addressing chaos and mixing in three-dimensional flows is small. One problem is that an experimentally tractable three-dimensional system that allows detailed experimental and computational investigation had not been available. A prototypical, bounded, three-dimensional, moderate-Reynolds-number flow is presented; this system lends itself to detailed experimental observation and allows high-precision computational inspection of geometrical and dynamical effects. The how structure, captured by means of cuts with a laser sheet (experimental Poincare section), is visualized via continuously injected fluorescent dye streams, and reveals detailed chaotic structures and chains of high-period islands. Numerical experiments are performed and compared with particle image velocimetry (PIV) and flow visualization results. Predictions of existing theories for chaotic advection in three-dimensional volume-preserving flows are tested. The ratio of two frequencies of particle motion - the frequency of motion around the vertical axis and the frequency of recirculation in the plane containing the axis-is identified as the crucial parameter. Using this parameter, the number of islands in the chain can be predicted. The same parameter-using as a base-case the integrable motion-allows the identification of operating conditions where small perturbations lead to nearly complete mixing.
URI: http://dx.doi.org/10.1017/S002211200000118X
http://dspace.library.iitb.ac.in/xmlui/handle/10054/5257
http://hdl.handle.net/10054/5257
ISSN: 0022-1120
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