 |
| Titel |
Turbulent thermal diffusion of aerosols in geophysics and in laboratory experiments |
| VerfasserIn |
A. Eidelman, T. Elperin, N. Kleeorin, A. Krein, I. Rogachevskii, J. Buchholz, G. Grünefeld |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1023-5809
|
| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 11, no. 3 ; Nr. 11, no. 3 (2004-07-27), S.343-350 |
| Datensatznummer |
250009239
|
| Publikation (Nr.) |
 copernicus.org/npg-11-343-2004.pdf |
|
|
|
|
|
| Zusammenfassung |
| 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. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|