Effects of Internal Flow and Viscosity Ratio on Measurements of Dynamic Forces between Deformable Drops
Scott A Edwards, Steven L Carnie, Ofer Manor, Derek YC Chan
LANGMUIR | AMER CHEMICAL SOC | Published : 2009
A model that has been shown to give very accurate predictions of dynamic forces between deformable emulsion drops and bubbles is used to quantify the effects of internal flow and viscosity ratio on the hydrodynamic interaction in such systems. The results demonstrate that direct force measurement using an atomic force microscope can readily differentiate whether the interfaces of drops of different viscosities respond as immobile (no-slip) or fully mobile (no tangential shear stress) boundaries.
This work is supported in part by Australian Research Council (ARC) funding through the Particulate Fluids Processing Centre, a Special Research Centre of the ARC, and through the Australian Minerals Science Research Institute, which also receives support from AMIRA International and State Governments of Victoria and South Australia. O.M. is supported by a University of Melbourne Postgraduate Research Scholarship. D.Y.C.C. is an Adjunct Professor at the National University of Singapore.