Modeling shear thickening in dilute polymer solutions: Temperature, concentration, and molecular weight dependencies

2003 ◽  
Vol 90 (11) ◽  
pp. 2997-3011 ◽  
Author(s):  
B. Jiang ◽  
D. J. Keffer ◽  
B. J. Edwards ◽  
J. N. Allred
2021 ◽  
Vol 5 (2) ◽  
pp. 22
Author(s):  
Karthik Nagarajan ◽  
Shing Bor Chen

Driven transport of dilute polymer solutions through porous media has been simulated using a recently proposed novel dissipative particle dynamics method satisfying the no-penetration and no-slip boundary conditions. The porous media is an array of overlapping spherical cavities arranged in a simple cubic lattice. Simulations were performed for linear, ring, and star polymers with 12 arms for two cases with the external force acting on (I) both polymer and solvent beads to model a pressure-driven flow; (II) polymer beads only, similar to electrophoresis. When the external force is in the direction of a principal axis, the extent of change in the polymers’ conformation and their alignment with the driving force is more significant for case I. These effects are most pronounced for linear chains, followed by rings and stars at the same molecular weight. Moreover, the polymer mean velocity is affected by its molecular weight and architecture as well as the direction and strength of the imposed force.


2005 ◽  
Vol 192 (1) ◽  
pp. 89-107 ◽  
Author(s):  
P. A. Kamerkar ◽  
B. J. Edwards ◽  
D. J. Keffer ◽  
C. W. Reneau

1989 ◽  
Vol 177 ◽  
Author(s):  
Yitzhak Rabin ◽  
H. C. Öttinger ◽  
K. Kawasaki

ABSTRACTWhile recent remrmalization group studies predict shear thickening in the limit of large Weissenberg numbers, scaling theories predict shear thinning. The ocntroversy is related to the question whether the Weissenberg number or the shear rate should be kept fixed when taking the limit of infinitely long polymers.


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