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Proceedings Paper

Relative molecular diffusion and tracers' localization in 1D channel
Author(s): E. Z. Gribova; A. I. Saichev
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Paper Abstract

For particles of the passive floating admixture initially located in the same physically infinitesimal volume in incompressible flow the features of clot's density behavior are discussed. For analyses of density evolution we study both analytically and numerically the motion of admixture in the random velocity field taking molecular collisions into account. Using the one-dimensional model, we analyze the closely related effects of relative molecular diffusion and fluctuations of density of particles. One can show that in the beginning admixture is in the Brownian motion mainly and then an influence of turbulence becomes more considerable. It is found that because of asymmetry of chaotic compression and tension the clot of particles compresses more often than stretches. As a result the effect of localization of particles takes place in spite of molecular diffusion strives for scattering particles far away. This effect may explain in particular processes of clouds formation or localization of oil spots on ocean surface.

Paper Details

Date Published: 14 February 2008
PDF: 9 pages
Proc. SPIE 6936, Fourteenth International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics, 69360C (14 February 2008); doi: 10.1117/12.783053
Show Author Affiliations
E. Z. Gribova, Nizhni Novgorod State Univ. (Russia)
A. I. Saichev, Nizhni Novgorod State Univ. (Russia)


Published in SPIE Proceedings Vol. 6936:
Fourteenth International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics

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