Linear Stability Analysis for Plane-Poiseuille Flow of an Elastoviscoplastic fluid with internal microstructure
arXiv:1007.2392 · doi:10.1016/j.jnnfm.2011.02.007
Abstract
We study the linear stability of Plane Poiseuille flow of an elastoviscoplastic fluid using a revised version of the model proposed by Putz and Burghelea (Rheol. Acta (2009)48:673-689). The evolution of the microstructure upon a gradual increase of the external forcing is governed by a structural variable (the concentration of solid material elements) which decays smoothly from unity to zero as the stresses are gradually increased beyond the yield point. Stability results are in close conformity with the ones of a pseudo-plastic fluid. Destabilizing effects are related to the presence of an intermediate transition zone where elastic solid elements coexist with fluid elements. This region brings an elastic contribution which does modify the stability of the flow.
References in corpus (1)
Cited by in corpus (5)
- Solid-fluid dynamics of yield-stress fluids
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- Linear Exponential Instability of the Hagen-Poiseuille Flow with Respect to Synchronous Bi-Periodic Disturbances
- A nonlinear dynamical system approach for the yielding behaviour of a viscoplastic fluid
- Unsteady laminar pipe flow of a Carbopol gel. Part I: experiment