Avaliação da distribuição e dinâmica de bolhas de ar em um tanque de flotação submetido a diferentes soluções utilizando CFD
Resumen
In the present graduation work, the objective was to evaluate the influence of different
surface tensions, viscosities and densities in the process of formation of air bubbles in a
flotation tank, using computational fluid dynamics (Computational Fluid Dynamics - CFD).
The input data for the simulations, as well as the geometry of the simulated equipment, were
based on data obtained experimentally. The simulations were conducted using the
FLUENT® 19.3 software. To verify the proposed model, the simulated velocity and bubble
diameter data were compared to the experimental results, both quantitatively and
qualitatively. In addition to diameter and velocity data, the terminal velocity of the bubbles
formed was analyzed, morphologically characterizing the air bubbles simulated according
to Clift's Abacus. Through the CFD it was possible to infer the behavior and dynamics of
the bubbles for the different conditions evaluated, with maximum deviations of 14.28% and
13.36%, respectively, between the bubble velocity and bubble diameter data obtained
experimentally and by simulations. The simulated terminal velocity results were consistent
with those obtained from theoretical models, with a maximum deviation of 19.05%. The
analysis of the results indicated that the simulated bubbles present the ellipsoidal oblate
shape. The mathematical model VOF (Volume of Fluid) was able to represent the
experimental condition, even explaining the phenomenon of coalescence of air bubbles.
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