Alexander Zerwas

CFD SIMULATION OF TWO-PHASE FLOW IN A VENTURI SCRUBBER: VALIDATION AND COMPARISON OF SECONDARY ATOMIZATION MODELS (SINGLE BLANK LINE SIZE 14) Alexander Ariyoshi Zerwas University of São Paulo, Dep. Chemical Engineering alexander.zerwas@usp.br (S José Luís de Paiva University of São Paulo, Dep. Chemical Engineering jolpaiva@usp.br (S 10) Abstract. In order to study the two-phase flow dynamics inside an industrial Venturi scrubber, the present work compares numerical simulations employing the standard k-ε turbulence model and the Eulerian-Lagrangian method with different droplet breakup models, as implemented in ANSYS CFX 15.0, with experimental data. It is also compared the influence of liquid injection in the droplet dispersion inside the Venturi scrubber, which was achieved by comparing injecting droplets with the same diameter and injecting droplets with a size-distribution (Rosin-Rammler). A better liquid dispersion was achieved using CAB model. (single space line, size 10)

Metal working fluids (MWF) used in machining processes are typically formulated as oil-in-water emulsions, consisting of an aqueous base with an emulsified oleous phase and additives. These emulsions degenerate over their lifetime leading to changed physical attributes, for instance increased droplet size or concentration. This temporal change may be monitored via optical measurement techniques, which require knowledge of the refractive index of the aqueous and oleous phases for the droplet size measurement. The optical dispersion of the aqueous phase is widely documented in the literature; however, there are no proper references available for the oleous phase for MWF. Thus, in this study the dependence of refractive indices on the wavelength of light of oils that are typically used for the formulation of MWF was determined. The measurements were performed using an Abbe refractometer at room temperature (22 ± 2 °C) in the visible light range at wavelengths between 430 and 680 nm. The results were fitted to the Cauchy dispersion equation describing the optical dispersion of the systems.