NDLI: Computations with viscoplastic and viscoelastoplastic fluids

Content Provider	Springer Nature Link
Author	Belblidia, Fawzi Tamaddon Jahromi, Hamid Reza Webster, Michael Francis Walters, Ken
Copyright Year	2010
Abstract	This numerical study focuses on regularised Bingham-type and viscoelastoplastic fluids, performing simulations for 4:1:4 contraction–expansion flow with a hybrid finite element–finite volume subcell scheme. The work explores the viscoplastic regime, via the Bingham–Papanastasiou model, and extends this into the viscoelastoplastic regime through the Papanastasiou–Oldroyd model. Our findings reveal the significant impact that elevation has in yield stress parameters, and in sharpening of the stress singularity from that of the Oldroyd/Newtonian models to the ideal Bingham form. Such aspects are covered in field response via vortex behaviour, pressure-drops, stress field structures and yielded–unyielded zones. With rising yield stress parameters, vortex trends reflect suppression in both upstream and downstream vortices. Viscoelastoplasticity, with its additional elasticity properties, tends to disturb upstream–downstream vortex symmetry balance, with knock-on effects according to solvent-fraction and level of elasticity. Yield fronts are traced with increasing yield stress influences, revealing locations where relatively unyielded material aggregates. Analysis of pressure drop data reveals significant increases in the viscoplastic Bingham–Papanastasiou case, O (12%) above the equivalent Newtonian fluid, that are reduced to 8% total contribution increase in the viscoelastoplastic Papanastasiou–Oldroyd case. This may be argued to be a consequence of strengthening in first normal stress effects.
Starting Page	343
Ending Page	360
Page Count	18
File Format	PDF
ISSN	00354511
Journal	Rheologica Acta
Volume Number	50
Issue Number	4
e-ISSN	14351528
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-10-19
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Viscoplastic Viscoelastoplastic Yield stress Bingham Papanastasiou models Characterization and Evaluation of Materials Food Science Soft and Granular Matter, Complex Fluids and Microfluidics Mechanical Engineering Polymer Sciences
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Condensed Matter Physics Materials Science

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