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Multiphase Science and Technology
SJR: 0.183 SNIP: 0.483 CiteScore™: 0.5

ISSN Druckformat: 0276-1459
ISSN Online: 1943-6181

Multiphase Science and Technology

DOI: 10.1615/MultScienTechn.v21.i1-2.40
pages 37-50

CFD SIMULATIONS OF THE TURBULENT LIQUID-LIQUID FLOW IN A KENICS STATIC MIXER

Zdzislaw Jaworski
Szczecin University of Technology, Al. Piastow 42, 71-065 Szczecin, Poland
Halina Murasiewicz
Szczecin University of Technology, Al. Piastow 42, 71-065 Szczecin, Poland

ABSTRAKT

The study is a continuation of an earlier work presented at the previous MFIP conference, where initial modelling results of the turbulent flow of a two-phase, liquid-liquid mixture in a Kenics static mixer were reported. Since then, more advanced transient simulations have been performed using the large eddy simulation (LES) approach. The numerical modelling for the mixer comprised of 10 mixing inserts was carried out using the commercial Fluent 6.2.16 code, while the mixer geometry and the respective block-structured grid with about 900 K cells were generated in Gambit 2.0.4. The two-phase flow was modelled employing the Eulerian approach in the version of the "mixture model" available in the code. The simulations were performed for a Reynolds number of 10,000, with a volumetric ratio of 99% water to 1% oil. Three cases were considered, which differed by the density of the two phases. The numerical analysis led to determination of the local fluctuating velocities, vorticity, helicity of the mixture, and the distribution of the dispersed phase ratio in cross sections of the mixer. The mixture ratio and velocity distributions along the mixer length were averaged in time and compared to those obtained in the RANS approach. Significant changes were noticed and less centrifugal effect on the phase separation was simulated using LES.

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