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Turbulent Thermal Diffusion of Aerosols in Geophysics and in Laboratory Experiments : Volume 11, Issue 3 (27/07/2004)

By Eidelman, A.

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Book Id: WPLBN0004019610
Format Type: PDF Article :
File Size: Pages 8
Reproduction Date: 2015

Title: Turbulent Thermal Diffusion of Aerosols in Geophysics and in Laboratory Experiments : Volume 11, Issue 3 (27/07/2004)  
Author: Eidelman, A.
Volume: Vol. 11, Issue 3
Language: English
Subject: Science, Nonlinear, Processes
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2004
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Buchholz, J., Elperin, T., Kleeorin, N., Krein, A., Rogachevskii, I., Eidelman, A., & Grünefeld, G. (2004). Turbulent Thermal Diffusion of Aerosols in Geophysics and in Laboratory Experiments : Volume 11, Issue 3 (27/07/2004). Retrieved from http://cloud-library.org/


Description
Description: The Pearlstone Center for Aeronautical Engineering Studies, Department of Mechanical Engineering, The Ben-Gurion University of the Negev, POB 653, Beer-Sheva 84105, Israel. We discuss a new phenomenon of turbulent thermal diffusion associated with turbulent transport of aerosols in the atmosphere and in laboratory experiments. The essence of this phenomenon is the appearance of a nondiffusive mean flux of particles in the direction of the mean heat flux, which results in the formation of large-scale inhomogeneities in the spatial distribution of aerosols that accumulate in regions of minimum mean temperature of the surrounding fluid. This effect of turbulent thermal diffusion was detected experimentally. In experiments turbulence was generated by two oscillating grids in two directions of the imposed vertical mean temperature gradient. We used Particle Image Velocimetry to determine the turbulent velocity field, and an Image Processing Technique based on an analysis of the intensity of Mie scattering to determine the spatial distribution of aerosols. Analysis of the intensity of laser light Mie scattering by aerosols showed that aerosols accumulate in the vicinity of the minimum mean temperature due to the effect of turbulent thermal diffusion.

Summary
Turbulent thermal diffusion of aerosols in geophysics and in laboratory experiments


 

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