Effect of Structure of Turbulence on Drop Breakage

Podgórska, W. and Baldyga, J. Effect of Structure of Turbulence on Drop Breakage Chemical Papers, Vol.56, No. 6, 2002, 412-417

Document type: ńĆl√°nok z ńćasopisu / Journal Article
Collection: Chemical papers  
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Author(s) Podgórska, W.
Baldyga, J.
Title Effect of Structure of Turbulence on Drop Breakage
Journal name Chemical Papers
Publication date 2002
Year available 2002
Volume number 56
Issue number 6
ISSN 0366-6352
Start page 412
End page 417
Place of publication Poland
Publisher Versita
Collection year 2002
Language english
Subject 290000 Engineering and Technology
290600 Chemical Engineering
290602 Process Control and Simulation
Abstract/Summary Possibilities of using several known models of microstructure of turbulence to model drop breakup rate are presented. The classical theory of turbulence neglects fine-scale intermittency. Here, intermittency is taken into account and modelled using multifractal formalism when applied to the inertial sub-range of turbulence. Maximum stable drop size, predicted by the classical theory of turbulence that neglects its intermittent character, is unequivocally determined by the mean energy dissipation rate and does not depend on the scale of the system provided that the mean energy dissipation rate is kept the same in each system. The breakage kinetics based on multifractal models of turbulence suggests a slow drift of the quasi-stable drop size to the stable drop size that is determined by the most vigorous turbulent events. Drop size distributions predicted by multifractal models are compared with predictions of the model based on the classical Kolmogorov theory of turbulence and with experimental data. All multifractal models predict the changes of the drop size in time better than the model based on the classical theory and are recommended to model the breakage processes.
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