Fluid Mechanics Seminar: Miguel Moyers-Gonzalez

Viscoplastic materials such as Bingham or Herschel Bulkley fluids have a yield stress which must be exceeded before they flow. Their behaviour lies somewhere between liquids and solids. In this talk I will first present a microscopic Gibbs field model that mimics the macroscopic yielding behaviour of a viscoplastic fluid, as a means to qualitatively validate our constitutive model. In the second part of the talk we look at laminar unsteady pipe flow of a Carbopol gel, which is a model viscoplastic fluid. By looking in detail at the solid-fluid transition of this material, we find a strong coupling between the irreversible deformation states and the phenomenon of wall slip (where the fluid behaves as if it is sliding along the wall).

 

 

 

Bio:

Dr. Miguel Moyers-Gonzalez completed his B.Sc. at the Instituto Tecnológico Autónomo de México and his M.Sc and Ph.D. at the University of British Columbia. He was a postdoctoral fellow at the Université de Montréal before joining the University of Durham as a Lecturer in Applied Mathematics. He is presently a Senior Lecturer in the School of Mathematics & Statistics at the University of Canterbury.