Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Numerical investigation of viscoelastic liquid curtain breakup
Submission Author:
marisa bazzi , RJ
Co-Authors:
Marcio CARVALHO, marisa bazzi
Presenter: marisa bazzi
doi://10.26678/ABCM.COBEM2017.COB17-0916
Abstract
The stability of thin liquid sheets is crucial for the success of many industrial processes, such as curtain coating applications. This stability is influenced by the type of disturbance that might emerge in the sheet and the properties of the fluid used. Previous experimental studies have shown that non-Newtonian fluids create more stable thin liquid sheets, however, the physical phenomenon responsible for this stability is not fully understood. This work addresses a numerical study of the influence of non-Newtonian properties on the stability of a thin liquid sheet. Using the Oldroyd-B model to describe a viscoelastic fluid on the influence of planar and axisymmetric perturbations, it was possible to observe that the viscoelastic properties, given by the number of Deborah and viscosity ratio of the polymer to the solvent, slow down the growth rate of perturbation leading to greater rupture time. We also investigated the influence of the perturbation type on liquid curtain stability through a linear stability analysis for a Newtonian fluid under an axisymmetric perturbation and compared to the numerical solution.The results suggest a lower stability criterion but higher growth rates for the axisymmetric perturbation compared with a planar perturbation.
Keywords
Viscoelastic flow, Numerical simulation, Curtain coating, Lubrication Theory
