Small Amplitude Oscillatory Extensional Rheometry for Viscoelastic Filaments

We revise a method of simultaneously characterizing multiple fluid parameters for a Newtonian filament by extending to viscoelastic filaments. We use oscillatory deformation that avoids breakup and imposes an external timescale. When combined with image processing to determine the free surface at various phases, this procedure can simultaneously determine the dimensionless surface tension, viscosity, relaxation and retardation times. We consider parametric strategies to determine an optimal regime for measurement under conditions of full and limited resolution.