Azevedo, Bruno Nieckele; Carvalho, Márcio da Silveira (Advisor). Flow of two drops through a straight microcapillary. Rio de Janeiro, 2014. 68p. MSc. Dissertation -Departamento de Engenharia Mecânica, Pontifícia Universidade Católica do Rio de Janeiro.Emulsions can be used as mobility control agent in enhanced oil recovery methods in order to achieve a more efficient sweep of the reservoir. The application of such technique requires full understanding of how emulsions flow in a porous material. The macroscopic flow behavior can be determined based on the pore scale flow, at which emulsions cannot be treated as a single phase non Newtonian liquid, since the drop diameters are in the same order of magnitude of the pore throats. Experiments by Cobos et al.(1) of flow of emulsions through constricted micro capillaries, wich served as a model to the geometry of a pore throat connecting two adjacent pore bodies, have shown the effect of the dispersed phase on the pressure drop for different flow conditions and emulsions characteristics. In order to widen the range of capillary number and drop size explored in the experiments and to determine the effect of interfacial tension, viscosity ratio, capillary geometry and determine the characteristics of the flow with more the one drop, we study the flow of a drops suspended in a continuous phase flowing through a constricted micro capillary. The evolution of the drop interface is determined by the level set method which is incorporated to a fully coupled implicit Navier Stokes solver based finite element method. We investigate the effect of an initial distance between the two drops, as well as the effects of the interfacial tension on the drops speed. The results provide a more detailed description of the flow of emulsions through pore throats.
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