Finite elements for thixotropic elasto-viscoplastic flows

Autores/as

  • Sérgio Frey
  • Fernanda B. Link
  • Márleson R. S. Ferreira
  • Mônica F. Naccache
  • Paulo R. de Souza Mendes

DOI:

https://doi.org/10.5540/03.2015.003.01.0242

Palabras clave:

Thixotropy, elasto-viscoplasticity, entry flow, multi-field GLS method.

Resumen

This work aims at performing finite element approximations for entry flows of thixo- tropic elasto-viscoplastic fluids, using the structured fluid model introduced in de Souza Mendes (2011). The constitutive equation is based on a modification of the Oldroyd-B viscoelastic equa- tion, with variable viscosity and relaxation time. According to this model, both the relaxation time and the viscosity are functions of a scalar parameter – denoted herein by structure parame- ter – that deals with microscopic changes in the material microstructure. All results are obtained using a four-field GLS-type method, aiming at determining the accurate morphology and position of the unyielded regions in entry flows of elasto-viscoplastic fluids through an one-to-four sudden expansion.

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Publicado

2015-08-25

Número

Sección

Mecânica dos Fluidos e Aplicações