The influence of dispersed-phase viscosity on droplet
breakup in a pump-mixer was determined using a direct measurement
approach, which was performed using a high-speed online camera. The
experimental results show that the interfacial stress and internal
viscous stress can be applied to characterize the influence of the
interfacial tension and dispersed-phase viscosity on drop breakup,
respectively. The daughter droplet size presents a bell-shaped distribution
and is slightly dependent on the drop restoring stress. An empirical
correlation of the drop breakup frequency function is established
to include the influence of the dispersed-phase viscosity. Moreover,
the new correlation reveals a clear physical relationship between
the variables of physical properties and hydraulic parameters, which
strengthens its extensibility when applied to other systems or equipment.
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