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| Titel |
Experimental detection of turbulent thermaldiffusion of aerosols in non-isothermal flows |
| VerfasserIn |
A. Eidelman, T. Elperin, N. Kleeorin, A. Markovich, I. Rogachevskii |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 13, no. 1 ; Nr. 13, no. 1 (2006-04-24), S.109-117 |
| Datensatznummer |
250011708
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| Publikation (Nr.) |
 copernicus.org/npg-13-109-2006.pdf |
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| Zusammenfassung |
| We studied experimentally a new phenomenon of turbulent thermal
diffusion of particles which can cause formation of the large-scale
aerosol layers in the vicinity of the atmospheric temperature
inversions. This phenomenon was detected experimentally in
oscillating grids turbulence in air flow. Three measurement
techniques were used to study turbulent thermal diffusion in
strongly inhomogeneous temperature fields, namely Particle Image
Velocimetry to determine the turbulent velocity field, an image
processing technique to determine the spatial distribution of
aerosols, and an array of thermocouples for the temperature field.
Experiments are presented for both, stably and unstably stratified
fluid flows, by using both directions of the imposed mean vertical
temperature gradient. We demonstrated that even in strongly
inhomogeneous temperature fields particles in turbulent fluid flow
accumulate at the regions with minimum of mean temperature of
surrounding fluids due to the phenomenon of turbulent thermal
diffusion. |
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