Oscillating grid turbulence and bulk mixing at high schmidt numbers

Authors

  • A. E. Kostazos,

    1. Chemical Engineering Department, Aristotle University of Thessaloniki, 54006 Thessaloniki, Greece
    Search for more papers by this author
  • P. S. Apikides,

    1. Chemical Engineering Department, Aristotle University of Thessaloniki, 54006 Thessaloniki, Greece
    Search for more papers by this author
  • E. G. Kastrinakis,

    Corresponding author
    1. Chemical Engineering Department, Aristotle University of Thessaloniki, 54006 Thessaloniki, Greece
    • Chemical Engineering Department, Aristotle University of Thessaloniki, 54006 Thessaloniki, Greece
    Search for more papers by this author
  • S. G. Nychas

    Corresponding author
    1. Chemical Engineering Department, Aristotle University of Thessaloniki, 54006 Thessaloniki, Greece
    • Chemical Engineering Department, Aristotle University of Thessaloniki, 54006 Thessaloniki, Greece
    Search for more papers by this author

Abstract

The mixing process of high Schmidt number (700-35000) aqueous solutions was investigated in an oscillating grid mixing vessel. The influence of the following variables on the mixing time was studied: Schmidt number, initial solution concentration, volume ratio of the liquids to be mixed and oscillating grid frequency. The measurements were compared with Corrsin's isotropic turbulent mixing theory. The data were correlated in the form of dimensionless groups, involving the aforementioned variables.

Abstract

On a étudié le procédé de mélange de solutions aqueuses ayant un nombre de Schmidt élevé (700-35000) dans une cuve de mélange à grille oscillatoire. On a analysé l'influence des variables suivantes sur le temps de mélange: le nombre de Schmidt, la concentration initiale de la solution, le rapport volumique des liquides à mélanger et la fréquence d'osillation de la grille. Les mesures ont été comparées à la théorie du mélange turbulent isotropique de Corrsin. Les données ont été corrélées sous la forme de groupes adimensionnels, faisant intervenir les variables susmentionnées.

Ancillary