The effect of oscillation on the drainage of an elastico-viscous liquid

Abstract

The oscillatory drainage of liquids simulated by the Oldroyd four-constant model is investigated using a numerical time-marching technique. The drainage of constant-viscosity elastic liquids is not significantly affected by the oscillatory motion whether applied parallel or orthogonal to the direction of the main flow. During the oscillatory drainage of shear-dependent elastic liquids, there is evidence of drainage enhancement and elastic recoil on applying the vibration parallel to the direction of the main flow. The recoil has the effect of thickening parts of the liquid film. On applying the vibration orthogonal to the direction of the main flow, for such liquids, enhancement is obtained for all film thicknesses.