Time evolution of mixing in the staggered herringbone microchannel

Citation data:

Modern Physics Letters B, ISSN: 0217-9849, Vol: 25, Issue: 12-13, Page: 1111-1125

Publication Year:
Usage 201
Abstract Views 162
Full Text Views 38
Link-outs 1
Captures 7
Exports-Saves 4
Readers 3
Citations 5
Citation Indexes 5
Repository URL:
https://works.bepress.com/petru_fodor/4; https://engagedscholarship.csuohio.edu/sciphysics_facpub/169; https://works.bepress.com/miron_kaufman/35
Fodor, Petru S.; Kaufman, Miron
World Scientific Pub Co Pte Lt
Physics and Astronomy; Microchannels; staggered herringbone mixer; mixing entropy; Physics
conference paper description
Patterning ridges on the surface of microchannels has been found to be a viable strategy to induce mixing in straight channels, despite their characteristically small Reynolds numbers. In order to identify the fundamental characteristics of the advection process, we evaluate the time evolution of the Rényi entropy associated with the spatial distribution of tracers carried by an incompressible fluid moving through such channels. It is found that independent of the channel surface geometry and of the Reynolds number, the time evolution of the Rényi distributive entropy follows a universal behavior described by a logarithmic increase with time, with a slope close to unity. On the other hand, an analysis of the Shannon mixing entropy evaluated from the time evolution of the position of two tracer species moving through the channel, reveals a cross-over between two different mixing mechanisms: one dominated by the stretching of the interface between the flow regions containing different tracers, and the other dominated by chaotic mixing induced by counter-rotating transversal flows. © 2011 World Scientific Publishing Company.