The dynamics of a single Newtonian drop immersed in a Newtonian matrix subjected to large-amplitude oscillatory shear flow is investigated. The ratio of the drop and matrix viscosity is above criticality, and thus break-up is absent under const. shear flow. At small forcing amplitudes the drop shape follows a "regular" oscillation. As the forcing amplitude increases, multipeaked oscillations of drop shape and orientation are obsd. Exptl. results are compared with predictions obtained with a phenomenol. model. Model predictions are in qual. good agreement with exptl. data. The model suggests that the appearance of higher harmonics in the drop response is mainly due to flow nonaffinity.

Newtonian drop in a Newtonian matrix subjected to large amplitude oscillatory shear flows

GUIDO, STEFANO;MAFFETTONE, PIER LUCA
2004

Abstract

The dynamics of a single Newtonian drop immersed in a Newtonian matrix subjected to large-amplitude oscillatory shear flow is investigated. The ratio of the drop and matrix viscosity is above criticality, and thus break-up is absent under const. shear flow. At small forcing amplitudes the drop shape follows a "regular" oscillation. As the forcing amplitude increases, multipeaked oscillations of drop shape and orientation are obsd. Exptl. results are compared with predictions obtained with a phenomenol. model. Model predictions are in qual. good agreement with exptl. data. The model suggests that the appearance of higher harmonics in the drop response is mainly due to flow nonaffinity.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11588/300998
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