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Simulations of pendant drop formation of a viscoelastic liquid
Davidson Malcolm R.,Harvie Dalton J.E.,Cooper-White Justin J. The Korean Society of Rheology 2006 Korea-Australia rheology journal Vol.18 No.2
A modified Volume-of-Fluid (VOF) numerical method is used to predict the dynamics of a liquid drop of a low viscosity dilute polymer solution, forming in air from a circular nozzle. Viscoelastic effects are rep-resented using an Oldroyd-B model. Predicted drop shapes are compared with experimental observations. The main features, including the timing of the shape evolution and the 'bead-on-a-string' effect, are well reproduced by the simulations. The results confirm published conclusions of the third author, that the deformation is effectively Newtonian until near the time of Newtonian pinch-off and that the elastic stress becomes large in the pinch region due to the higher extensional flow there.
Simulations of pendant drop formation of a viscoelastic liquid
Malcolm R. Davidson,Dalton J.E. Harvie,Justin J. Cooper-White 한국유변학회 2006 Korea-Australia rheology journal Vol.18 No.2
A modified Volume-of-Fluid (VOF) numerical method is used to predict the dynamics of a liquid drop of a low viscosity dilute polymer solution, forming in air from a circular nozzle. Viscoelastic effects are represented using an Oldroyd-B model. Predicted drop shapes are compared with experimental observations. The main features, including the timing of the shape evolution and the "bead-on-a-string" effect, are well reproduced by the simulations. The results confirm published conclusions of the third author, that the deformation is effectively Newtonian until near the time of Newtonian pinch-off and that the elastic stress becomes large in the pinch region due to the higher extensional flow there.