Linear stability analysis for plane-Poiseuille flow of an elastoviscoplastic fluid with internal microstructure for large Reynolds numbers |
| |
Authors: | Miguel Moyers-Gonzalez Teodor I Burghelea Julian Mak |
| |
Institution: | 1. CEFT/FEUP, Universidade do Porto, Rua Dr. Roberto Frias, Porto 4200-465, Portugal;2. INEGI, Campus da FEUP, Rua Dr. Roberto Frias, Porto 4200-465, Portugal;3. LAETA, IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal |
| |
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 (A.M.V. Putz, T.I. Burghelea, Rheol. Acta 48 (2009) 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. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|