[Zurück]

S. Radel, A.J. McLoughlin, W.T. Coakley, M. Gröschl, E. Benes:
"Turbulence influencing ultrasonically enhanced settling of yeast in water-rich ethanol mixtures";
in: "Proc. 1st Congress of Alps Adria Acoustics Association / 3rd Congress of Slovenian Acoustical Society", M. Cudina (Hrg.); Slovenian Acoustical Society, Portoroz/Slowenien, 2003, ISBN: 961-6238-73-6, S. 321 - 328.

Ultrasonically Enhanced Settling is a principle successfully applied for the separation of
suspended particles, e.g. as cells filters in biotechnology. The devices utilize radiation forces
spatially re-arranging particles in the pressure nodal planes of a quasi-stationary ultrasonic
wave field.
However, suspensions of yeast in water-rich ethanol mixtures showed an unexpected
breakdown of this spatial distribution. Further examinations of this turbulence in the
separation system yielded the development of mass density and speed of sound of waterethanol
mixtures over the concentration of ethanol as a possible explanation. For certain
percentages of ethanol the ordering effect of the radiation forces exerted by the quasi-standing
wave might be too small.
This work was supported in part by the European Commission, TMR Network Contract No.
ERBFMRXCT97-0156 (EuroUltraSonoSep).

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