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DROP BREAK-UP AND COALESCENCE IN A STIRRED TANK

Abstract

It is shown in the paper that drop size distribution in liquid-liquid dispersions is affected by both the fine-scale and the large-scale inhomogeneity of turbulence. Fine-scale inhomogeneity is related to the phenomenon of local intermittency and described using a multifractal formalism. Largescale inhomogeneity is related to inhomogeneous distributions of the locally averaged properties of turbulence, including the rate of energy dissipation and the integral scale of turbulence. Large-scale distributions of the properties of turbulence in a stirred tank are considered with a network of wellmixed zones. CFD methods are used to compute the properties of turbulence in these zones. A model taking into account inhomogeneity of both types explains the effect of the system’s scale on drop size; it predicts smaller maximum stable drop sizes than the classic Kolmogorov theory of turbulence. The model predictions agree well with experimental data.

Keywords:

CFD, intermittence, large-scale inhomogeneity, small-scale inhomogeneity

Details

Issue
Vol. 7 No. 3 (2003)
Section
Research article
Published
2003-09-30
Licencja:
Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Author Biographies

WIOLETTA PODGÓRSKA ,
Warsaw University of Technology, Department of Chemical and Process Engineering



JERZY BAŁDYGA,
Warsaw University of Technology, Department of Chemical and Process Engineering



Authors

  • WIOLETTA PODGÓRSKA

    Warsaw University of Technology, Department of Chemical and Process Engineering
  • JERZY BAŁDYGA

    Warsaw University of Technology, Department of Chemical and Process Engineering

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