Díaz Maldonado, Misael

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Dynamics and rheology of Janus drops
(2015) Díaz Maldonado, Misael; Córdova Figueroa, Ubaldo M.; College of Engineering; Acevedo Rullán, Aldo; Bogere, Moses N.; Almodóvar Montañez, Jorge L.; Department of Chemical Engineering; Valentín Rullán, Ricky
This dissertation sheds some light on the dynamics and rheological properties of compound multiphase drops in the creeping motion limit of the fluid phases from a fundamental standpoint. A compound multiphase drop can exhibit a fully engulfing configuration, as in the case of a drop encapsulating a smaller one, or a partly engulfed configuration, in which a pair of drops in contact resemble a snowman. A particular of the latter type that is under active research is the Janus drop due to its anisotropic properties. The term Janus, which takes after the god of two faces of Roman mythology, highlights that the drop consists of two parts of equal geometry but of different properties (anisotropic). It is found that the dynamics of such Janus drop in an external flow is similar to that of a spheroid of revolution. Interestingly, the effective viscosity of Janus drops that corresponds to the minimum dissipation energy has an analogous form to the expression derived by Taylor (1932) Proc. R. Soc. A 138, 41–48 for a single-phase drop in a steady shear flow.