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Sixth International Symposium on Turbulence and Shear Flow Phenomena
June, 22-24, 2009 , Seoul National University, Seoul, Korea

DOI: 10.1615/TSFP6

Stirring, folding and mixing in electromagnetically driven flows of controlled geometry and acceleration (experiments and numerical simulations)

pages 87-92
DOI: 10.1615/TSFP6.130
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RESUMO

Prior to study mixing via the temporal evolution of passive scalars, the authors attempt to isolate the key mechanisms to stir flows of controlled geometries. The stretching properties of these flows are studied using a strain rate approach. The folding and lamination rate properties are them quantified and explored using a new approach proposed by (Rossi 2009) which is based on the spatial variation of the Lagrangian angular velocity. The main emphasis of this paper is set on the determination of folding and lamination rate of multi- and one-scale flows using this novel approach. Such results are complemented by the description of these flows, including: visualisations, velocity, acceleration and strain rate fields. This quantification of folding and lamination rates is found to highlight subtle and important flow properties for both multi- and one-scale flows. It permits to identify scales and rates of lamination. Also, the good agreement between visualisation based on the deformation of a mesh and Lagrangian averaging of folding and lamination rate intensity is striking. This is extremely encouraging to pursue the exploration of this laminating approach and its offspring for mixing studies in complex flows.

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