Nonisothermal Elongational Flow of Polymeric Fluids According to the Leonov Model

1984 ◽  
Vol 28 (5) ◽  
pp. 581-599 ◽  
Author(s):  
R. K. Upadhyay ◽  
A. I. Isayev
Keyword(s):  
Elongational Flow ◽  
Polymeric Fluids ◽  
Leonov Model

Elongational flow behavior of polymeric fluids according to the Leonov model

1983 ◽  
Vol 22 (6) ◽  
pp. 557-568 ◽  
Author(s):  
R. K. Upadhyay ◽  
A. I. Isayev
Keyword(s):  
Flow Behavior ◽  
Elongational Flow ◽  
Polymeric Fluids ◽  
Leonov Model

Transient shear flow behavior of polymeric fluids according to the Leonov model

1981 ◽  
Vol 20 (5) ◽  
pp. 443-457 ◽  
Author(s):  
R. K. Upadhyay ◽  
A. I. Isayev ◽  
S. F. Shen
Keyword(s):  
Shear Flow ◽  
Flow Behavior ◽  
Polymeric Fluids ◽  
Leonov Model ◽  
Transient Shear Flow

Electrokinetics of polymeric fluids in narrow rectangular confinements

Soft Matter ◽  
2021 ◽  
Author(s):  
Aditya Natu ◽  
Uddipta Ghosh
Keyword(s):  
Cross Section ◽  
Rectangular Cross Section ◽  
Double Layers ◽  
Polymeric Fluids ◽  
Polymeric Liquids ◽  
Electrical Double Layers

Flow of polymeric liquids in narrow confinements of rectangular cross section, in the presence of electrical double layers is analyzed here. Our analysis is motivated by the fact that many...

A Continuous Lubricated Squeezing Flow Technique to Study the Rheological Behavior of Polymer Melts in Equibiaxial Elongational Flow

2008 ◽  
Author(s):  
David Venerus ◽  
Teresita Guadarrama-Medina ◽  
Tai-Yi Shiu ◽  
Albert Co ◽  
Gary L. Leal ◽  
...  
Keyword(s):  
Rheological Behavior ◽  
Polymer Melts ◽  
Elongational Flow ◽  
Squeezing Flow ◽  
Lubricated Squeezing Flow

Shear degradation resistance of star poly(ethyleneimine) - polyacrylamides during elongational flow

e-Polymers ◽  
2011 ◽  
Vol 11 (1) ◽  
Author(s):  
Ming Duan ◽  
Shenwen Fang ◽  
Liehui Zhang ◽  
Fuxiao Wang ◽  
Peng Zhang ◽  
...  
Keyword(s):  
Shear Rate ◽  
Aqueous Solutions ◽  
Relative Viscosity ◽  
Reduction Rate ◽  
Elongational Flow ◽  
Exponential Dependence ◽  
Distilled Water ◽  
Shear Stability ◽  
Low Viscosity ◽  
Shear Degradation

AbstractAn experimental study of the flow-induced scission behaviour of four star hydrolyzed polyacrylamides (HPMA) with different arms during planar elongational flow in a cross-slot flow cell is described. The results showed that the shear stability of linear HPAM in distilled water was not essentially different from star HPAM. Polymer scission was not observed in either system in a shear rate range from 20,000 to 100,000s-1, which can be attributed to the strong polyelectrolyte behaviour of HPAM in distilled water. However, at the same shear rate, the star HPAMs exhibited superior shear stability in comparison to the linear HPAMs in aqueous solutions containing NaCl (CNaCl=0.2-1.0%wt) and, in particular, the initial reduction rate of relative viscosity (R) decreased with the degree of branching of the HPAMs. In addition, it was found that the R of five HPAMs in NaCl aqueous solutions exhibited an exponential dependence on shear rate, in which the coefficient C1 can be used to quantitatively evaluate shear stability. In star HPAM NaCl aqueous solutions, the increase of R with shear rate is very likely due to the decrease of the hydrodynamic radius (Rh) of these HPAMs, while the increase of R with NaCl concentrations can be attributed to the relatively low viscosity of these polymers at high NaCl concentrations.

Extended kinetic theory of polymeric fluids

1996 ◽  
Vol 5 (6) ◽  
pp. 1121-1142 ◽  
Author(s):  
Miroslav Grmela ◽  
Bogdan Z. Dlugogorski ◽  
Georgy Lebon
Keyword(s):  
Kinetic Theory ◽  
Polymeric Fluids
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