Abstract
In this work, the characteristics of the breakup in simple shear flow of double emulsion drops, suspended in a continuous immiscible, Newtonian phase, are studied. Double emulsions have been proposed as a medium for extraction but the breakup of drops reduces the efficiency of the extraction. Double emulsion drop breakup due to viscous forces was studied in a transparent cone-and-plate viscometer. The deformation or breakup parameter is the ratio of the applied viscous force when the drop ruptures to the surface tension force. This parameter can be correlated with the ratio of the apparent viscosity of the double emulsion drop to the viscosity of the continuous phase to yield a breakup curve. Although mechanistically double emulsion drops break up similarly to homogeneous Newtonian drops, the breakup curves for these two systems are different. It is shown that the elasticity of the double emulsion drops is in part responsible for this behavior.
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