Dynamic hysteresis in the rheology of complex fluids

A Puisto, M Mohtaschemi, MJ Alava, X Illa

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)
25 Downloads (Pure)

Abstract

Recently, rheological hysteresis has been studied systematically in a wide range of complex fluids combining global rheology and time-resolved velocimetry. In this paper we present an analysis of the roles of the three most fundamental mechanisms in simple-yield-stress fluids: structure dynamics, viscoelastic response, and spatial flow heterogeneities, i.e., time-dependent shear bands. Dynamical hysteresis simulations are done analogously to rheological ramp-up and -down experiments on a coupled model which incorporates viscoelasticity and time-dependent structure evolution. Based on experimental data, a coupling between hysteresis measured from the local velocity profiles and that measured from the global flow curve has been suggested. According to the present model, even if transient shear banding appears during the shear ramps, in typical narrow-gap devices, only a small part of the hysteretic response can be attributed to heterogeneous flow. This results in decoupling of the hysteresis measured from the local velocity profiles and the global flow curve, demonstrating that for an arbitrary time-dependent rheological response this proposed coupling can be very weak.
Original languageEnglish
Article number042314
Pages (from-to)1-8
JournalPhysical Review E
Volume91
Issue number4
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

Fingerprint Dive into the research topics of 'Dynamic hysteresis in the rheology of complex fluids'. Together they form a unique fingerprint.

Cite this