Prof.
Karl-Heinz Raedler
(Astrophysical Institute Potsdam)
2/16/11, 2:00 PM
It is demonstrated that the total mean-field diffusivity for
passive scalar transport in a compressible fluid showing
isotropic turbulence may well be smaller than the molecular
diffusivity. This is in full analogy to the old finding
regarding the magnetic mean-field diffusivity in an
electrically conducting turbulently moving compressible
fluid (e.g. Krause and Rädler 1980). For both...