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Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union
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Volume 13, issue 1 | Copyright

Special issue: Nonlinear dynamics of Earth-Oceans-Space (EOS2005)

Nonlin. Processes Geophys., 13, 109-117, 2006
https://doi.org/10.5194/npg-13-109-2006
© Author(s) 2006. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

  24 Apr 2006

24 Apr 2006

Experimental detection of turbulent thermaldiffusion of aerosols in non-isothermal flows

A. Eidelman, T. Elperin, N. Kleeorin, A. Markovich, and I. Rogachevskii A. Eidelman et al.
  • The Pearlstone Center for Aeronautical Engineering, Studies, Department of MechanicalEngineering, The Ben-Gurion University of the Negev, POB 653, Beer-Sheva 84 105, Israel

Abstract. 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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