Drop - Drop Behaviour for Periodic Drive Profiles
by Chu Wu
Abstract: Interactions of bubbles and drops are very difficult to predict due to the complicated relationship between film drainage and drop deformation. When two surfaces separated by a thin film are pushed together they experience hydrodynamic pressure from film drainage and disjoining pressure due to surface chemistry. This causes the deformable surfaces to undergo shape changes which in turn influence film drainage. The Stokes Reynolds Young Laplace model is used to describe such interactions and has been successful in modelling data from AFM experiments where drops are pushed together using the cantilever and the force is obtained from the deflection. This presentation will focus on the case where two drops are pushed and pulled apart repeatedly with different retraction speeds to determine whether retraction velocities will influence coalescence.