MULTI-SCALE SIMULATIONS OF STIRRED LIQUID -- LIQUID DISPERSIONS

Direct numerical simulations (DNS) of liquid -liquid dispersions in a three-dimensional periodic domain have been performed by means of the lattice -Boltzmann method. The dis- persion was agitated by a random force field such as to produce isotropic turbulence. The turbu- lence levels and its history were based on a fluid parcel in a turbulently stirred tank traversing the impeller swept region. The DNS provide detailed insight in the coalescence and break-up events brought about by the turbulent flow, the evolution of the drop size distribution in time, and the interaction of the small-scale flow and the droplets as witnessed in terms of the spectral charac- teristics of the turbulence.

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