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Diffusion of passive scalar in a finite-scale random flow

Abstract:

A model of the decay of scalar variance in a single-scale random velocity field was considered. It was emphasized that in any laboratory experiment aiming to test the results, the stirring must be done at scales substantially smaller than the system size. The key factor was found to be the statistics of fluid displacements, which were integrals of velocity and were finite-time correlated even for a white-in-time velocity. A set up allows to show experimentally that the global mixing rate was ...

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Publisher copy:
10.1103/PhysRevE.70.046304
Journal:
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics More from this journal
Volume:
70
Issue:
4 2
Publication date:
2004-10-01
DOI:
ISSN:
1539-3755
Language:
English
Pubs id:
pubs:160747
UUID:
uuid:cc0f0576-4a20-4398-bbee-46f34039d0ee
Local pid:
pubs:160747
Source identifiers:
160747
Deposit date:
2013-02-20

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