Drop Dispensing From Non-Circular Nozzles

The paper investigates the drop formation process in the case of nozzles having non-circular cross-sections. The drops are created in a viscous Newtonian immiscible outer liquid, the injected fluids being either Newtonian or viscoelastic. We investigate the influence of nozzle geometry on the frequency of drop generation. We find no alteration of the frequency of drop generation when cross-sections have the same hydraulic diameter and when Newtonian fluids are injected. We also propose a simple model of the advance velocity of the apex of the drop based on experimental observations regarding the final stages of drop formation.