Shear History Effects on Extensional Flow of Non-Newtonian Fluids in Filament Stretching Rheometers

2008 ◽  
Author(s):  
Minwu Yao ◽  
Gareth H. McKinley ◽  
Albert Co ◽  
Gary L. Leal ◽  
Ralph H. Colby ◽  
...  
Keyword(s):  
Extensional Flow ◽  
Newtonian Fluids ◽  
History Effects ◽  
Filament Stretching ◽  
Shear History

scholarly journals Using filament stretching rheometry to predict strand formation and "processability" in adhesives and other non-Newtonian fluids

2000 ◽  
Vol 39 (4) ◽  
pp. 321-337 ◽  
Author(s):  
Anubhar Tripathi ◽  
P. Whittingstall ◽  
Gareth H. McKinley
Keyword(s):  
Newtonian Fluids ◽  
Filament Stretching

scholarly journals Shear thinning and thickening of cemented paste backfill

2019 ◽  
Vol 29 (1) ◽  
pp. 80-93 ◽  
Author(s):  
Liuhua Yang ◽  
Hongjiang Wang ◽  
Aixiang Wu ◽  
Hong Li ◽  
Arlin Bruno Tchamba ◽  
...  
Keyword(s):  
Shear Rate ◽  
Rheological Properties ◽  
Yield Stress ◽  
Shear Thinning ◽  
High Shear ◽  
Cemented Paste Backfill ◽  
Concentrated Suspension ◽  
History Effects ◽  
Paste Backfill ◽  
Shear History

Abstract Cemented paste backfill (CPB) is considered to be a concentrated suspension in which tailings are bonded together by the hydraulic binder and water, and it has a high solid volume concentration (≥50 vol.%). Although the shear thinning and thickening of CPB has been extensively reported in literature, the shear history effects have been ignored in previous studies. In this paper, by using rheometer and Focused Beam Reflectance Measurement, the relationship between the rheological properties and microstructure of the paste under different shear histories was studied. The results have shown that at a low shear rate, CPB revealed shear thinning, low yield stress and low index parameters; while exhibited shear thickening, high yield stress and high consistency index when at high shear rates of shear history. This agreed with the general trends shown in the FBRM analysis. It was proposed that the action of shear is beneficial to particle dispersion, whereas a high shear rate history tends to promote the aggregation of particles. It was revealed that both shear thinning and thickening of paste are related to the situation of particles (flocculation, dispersion and aggregation), and shear history effects play an important role in rheological properties of CPB.

Some Storage and Shear History Effects on Polymeric Friction Reduction

1972 ◽  
Vol 6 (2) ◽  
pp. 66-69 ◽  
Author(s):  
A. T. ELLIS ◽  
R. Y. TING ◽  
R. H. NADOLINK
Keyword(s):  
Friction Reduction ◽  
History Effects ◽  
Shear History

Extensional flow-induced crystallization of isotactic poly-1-butene using a filament stretching rheometer

2011 ◽  
Vol 55 (4) ◽  
pp. 901-920 ◽  
Author(s):  
Manojkumar Chellamuthu ◽  
Deepak Arora ◽  
H. Henning Winter ◽  
Jonathan P. Rothstein
Keyword(s):  
Extensional Flow ◽  
Filament Stretching ◽  
Induced Crystallization ◽  
Flow Induced Crystallization

Shear history effects in the spinning of polymers

AIChE Journal ◽  
1982 ◽  
Vol 28 (6) ◽  
pp. 900-907 ◽  
Author(s):  
Jan Mewis ◽  
Guido De Cleyn
Keyword(s):  
History Effects ◽  
Shear History

Shear History Effects in Associative Thickener Solutions

1998 ◽  
Vol 31 (22) ◽  
pp. 7691-7697 ◽  
Author(s):  
Sean T. Vittadello ◽  
Simon Biggs
Keyword(s):  
History Effects ◽  
Associative Thickener ◽  
Shear History

scholarly journals Towards a universal shear correction factor in filament stretching rheometry

2021 ◽  
Author(s):  
F. P. A. van Berlo ◽  
R. Cardinaels ◽  
G. W. M. Peters ◽  
P. D. Anderson
Keyword(s):  
Correction Factor ◽  
Extensional Flow ◽  
Rheological Behaviour ◽  
Extension Rate ◽  
Systematic Analysis ◽  
Shear Correction Factor ◽  
Aspect Ratios ◽  
Filament Stretching ◽  
Non Linear ◽  
Linear Viscoelastic

AbstractFilament stretching rheometry is a prominent experimental method to determine rheological properties in extensional flow whereby the separating plates determine the extension rate. In literature, several correction factors that can compensate for the errors introduced by the shear contribution near the plates have been introduced and validated in the linear viscoelastic regime. In this work, a systematic analysis is conducted to determine if a material-independent correction factor can be found for non-linear viscoelastic polymers. To this end, a finite element model is presented to describe the flow and resulting stresses in the filament stretching rheometer. The model incorporates non-linear viscoelasticity and a radius-based controller for the plate speed is added to mimic the typical extensional flow in filament stretching rheometry. The model is validated by comparing force simulations with analytical solutions. The effects of the end-plates on the extensional flow and resulting force measurements are investigated, and a modification of the shear correction factor is proposed for the non-linear viscoelastic flow regime. This shows good agreement with simulations performed at multiple initial aspect ratios and strain rates and is shown to be valid for a range of polymers with non-linear rheological behaviour.

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