Dispersion Studies of Agglomerates in Steady and Dynamic Flows of Polymeric Materials

2002 ◽  
Vol 75 (1) ◽  
pp. 119-132 ◽  
Author(s):  
P. Levresse ◽  
I. Manas-Zloczower ◽  
D. L. Feke
Keyword(s):  
Shear Flow ◽  
Polymeric Materials ◽  
Oscillatory Shear ◽  
Hydrodynamic Dispersion ◽  
Low Density ◽  
Flow Conditions ◽  
Erosion Rates ◽  
Oscillatory Shear Flow ◽  
Steady Shear Flow ◽  
Dynamic Flows

Abstract The hydrodynamic dispersion of spherical calcium carbonate agglomerates was studied under both steady and oscillatory shear-flow conditions. For a given intensity of steady shear flow, erosion rates were strongly influenced by the cohesive strength of the agglomerates with less cohesive, low-density agglomerates exhibiting faster erosion than high-density agglomerates. The dispersion kinetics were also affected by the extent of matrix infiltration within the agglomerate, with more infiltration resulting in reduced erosion rates. Experiments conducted in oscillatory shear flow fields provided new insights on local mechanisms of erosion.

ON THE EXTENDED RUTGERS–DELAWARE RULE FOR MR SUSPENSIONS UNDER MAGNETIC FIELDS

2006 ◽  
Vol 20 (05) ◽  
pp. 579-592 ◽  
Author(s):  
Y. B. YANG ◽  
G. CHEN ◽  
L. LI ◽  
W. H. LI
Keyword(s):  
Magnetic Fields ◽  
Shear Flow ◽  
Magnetic Particles ◽  
Volume Fraction ◽  
Complex Viscosity ◽  
Shift Factor ◽  
Oscillatory Shear ◽  
Oscillatory Shear Flow ◽  
Steady Shear Flow ◽  
Series Of Experiments

The interrelation between apparent viscosity in steady shear flow and complex viscosity in oscillatory shear flow for magnetorheological (MR) suspensions is investigated. Series of experiments have been conducted using a MR rheometer. An extended Rutgers–Delaware rule is proposed, in which an effective shear rate for oscillatory shear flow is defined as ωΔh. Here ωΔh is the shift factor dependent on strain amplitude (γ0), which was found to be similar for different MR suspensions under different magnetic fields. At high strain amplitudes (γ0≥100%), Δh≈γ0, the Rutgers–Delaware rule is approximately obeyed. At low strain amplitudes (γ0<100%), the curves of Δh fall between the line of the Cox–Merz rule and that of the Rutgers–Delaware rule. The curve of Δh at low strain amplitudes depends on the ingredients of the MR suspension. For samples with the same ingredients, a unified curve of Δh can be identified in a range of magnetic fields and/or for a range of volume fraction of magnetic particles.

The first normal stress difference of non-Brownian hard-sphere suspensions in the oscillatory shear flow near the liquid and crystal coexistence region

Soft Matter ◽  
2020 ◽  
Vol 16 (43) ◽  
pp. 9864-9875
Author(s):  
Young Ki Lee ◽  
Kyu Hyun ◽  
Kyung Hyun Ahn
Keyword(s):  
Shear Flow ◽  
Normal Stress ◽  
Hard Sphere ◽  
Normal Stress Difference ◽  
Oscillatory Shear ◽  
Stress Difference ◽  
Large Amplitude Oscillatory Shear ◽  
First Normal Stress Difference ◽  
Oscillatory Shear Flow ◽  
Sphere Suspensions

The first normal stress difference (N1) as well as shear stress of non-Brownian hard-sphere suspensions in small to large amplitude oscillatory shear flow is investigated.

Dynamic simulations of individual macromolecules in oscillatory shear flow

2009 ◽  
Vol 53 (2) ◽  
pp. 275-291 ◽  
Author(s):  
Dennis G. Thomas ◽  
Ryan J. DePuit ◽  
Bamin Khomami
Keyword(s):  
Shear Flow ◽  
Oscillatory Shear ◽  
Dynamic Simulations ◽  
Oscillatory Shear Flow

Order in polymeric liquids under oscillatory shear flow

2019 ◽  
Vol 31 (3) ◽  
pp. 033103 ◽  
Author(s):  
Mona A. Kanso ◽  
L. Jbara ◽  
A. J. Giacomin ◽  
C. Saengow ◽  
P. H. Gilbert
Keyword(s):  
Shear Flow ◽  
Oscillatory Shear ◽  
Polymeric Liquids ◽  
Oscillatory Shear Flow

Pattern method for higher harmonics from macromolecular orientation in oscillatory shear flow

2020 ◽  
Vol 32 (1) ◽  
pp. 011703 ◽  
Author(s):  
A. J. Giacomin ◽  
L. M. Jbara ◽  
C. Saengow
Keyword(s):  
Shear Flow ◽  
Oscillatory Shear ◽  
Higher Harmonics ◽  
Oscillatory Shear Flow
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