Abstract
The dependence of the chaotic mixing of fluids on the Reynolds number Re in a partitioned-pipe mixer (PPM), composed of alternately placed horizontal and vertical plates in a rotating cylinder, is studied. By numerical simulations of the velocity field and fluid mixing, tubular transport barriers extending in the axial direction are observed. Some of them expand in their cross-sectional area with increasing R e . We find that the barriers exist within the regions where the flow is locally symmetric, that is, nearly two-dimensional, and that the expansion of the barriers occurs in accordance with the expansion of the regions where the flow is symmetric with increasing R e .
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