Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
PURE ELASTIC INSTABILITY OF WORMLIKE MICELLES FLOW IN A CROSS-SLOT
Submission Author:
Francisco S. Forte Neto , PA
Co-Authors:
Francisco S. Forte Neto, Antônio da Cruz
Presenter: Francisco S. Forte Neto
doi://10.26678/ABCM.COBEM2019.COB2019-2026
Abstract
This work presents a numerical study of the elastic instability in a surfactant micellar solution when flowing through a cross-slot bifurcation. The elastic instability is characterized by the break of the symmetry of the flow. We adopt the two species VCM model for the wormlike micelles evolution in the flow. The model was implemented and solved in the finite element software COMSOL Multiphysics. Numerical simulations show that the symmetry breakage of the flow due to the elastic instability in micellar solutions occurs for a critical Deborah number. Further, we verify the influence of a source/sink terms presented in the balance equations for the number density of the chains, which have a strong influence on the total number density of the chains. This suggests that it should not be neglected in this type of analysis.
Keywords
Elastic instability, wormlike micelles, cross-slot bifurcation, Finite Elements
