Rheological tests with a Boger fluid and a rough geometry

2018 ◽  
Author(s):  
Liana Pasqualina Paduano ◽  
Sergio Caserta ◽  
Mario Minale ◽  
Claudia Carotenuto
Keyword(s):  
Boger Fluid

Birefringence and computational studies of a polystyrene Boger fluid in axisymmetric stagnation flow

2000 ◽  
Vol 91 (2-3) ◽  
pp. 189-220 ◽  
Author(s):  
Ji-Ming Li ◽  
Wesley R. Burghardt ◽  
Bin Yang ◽  
Bamin Khomami
Keyword(s):  
Computational Studies ◽  
Stagnation Flow ◽  
Boger Fluid

Observations on the elastic instability in cone-and-plate and parallel-plate flows of a polyisobutylene Boger fluid

1991 ◽  
Vol 40 (2) ◽  
pp. 201-229 ◽  
Author(s):  
Gareth H. McKinley ◽  
Jeffrey A. Byars ◽  
Robert A. Brown ◽  
Robert C. Armstrong
Keyword(s):  
Parallel Plate ◽  
Elastic Instability ◽  
Boger Fluid

The motion of two spheres falling along their line of centres in a Boger fluid

1998 ◽  
Vol 79 (2-3) ◽  
pp. 191-212 ◽  
Author(s):  
E.T.G Bot ◽  
M.A Hulsen ◽  
B.H.A.A van den Brule
Keyword(s):  
Boger Fluid

Spreading of Boger fluid on horizontal surface

2013 ◽  
Vol 202 ◽  
pp. 120-130 ◽  
Author(s):  
Jeongin Han ◽  
Chongyoup Kim
Keyword(s):  
Horizontal Surface ◽  
Boger Fluid

scholarly journals Study of non-Newtonian polymer blends using large amplitude oscillatory shearing flow

2021 ◽  
Author(s):  
Isameldeen E. Daffallah ◽  
◽  
Abdulwahab S. Almusallam ◽  
Keyword(s):  
Molecular Weight ◽  
Polymer Blends ◽  
High Molecular Weight ◽  
Large Amplitude ◽  
Matrix Phase ◽  
Deformation Condition ◽  
Boger Fluid ◽  
Boger Fluids ◽  
Cv Model ◽  
Droplet Phase

Large amplitude oscillatory shear (LAOS) was performed on non-Newtonian minor phase in Newtonian matrix phase polymer blends as a first step toward understating more complex immiscible polymer blends under high deformation condition. The blend consists polybutadiene (PBD) as the droplet phase and polydimethylsiloxane (PDMS) as the matrix phase. The PBD droplet phase was an elastic “Boger” fluid prepared by dissolving a high-molecular-weight PBD into a low-molecular-weight Newtonian PBD. Different percentages of the high-molecular-weight PBD were used to prepare different types of Boger fluids that resulted in blends with different viscosity ratios from lower than unity, to unity and higher than unity. Furthermore, the LAOS results of the blends were analyzed by using the Fourier Transform (FT) technique. From a theoretical point of view, the constrained volume model (CV-model) for Newtonian components is adapted to the case of a Newtonian matrix phase and non-Newtonian Boger fluid droplet phase by taking into account stresses that arise in the Boger fluids. The adapted model and the Newtonian CV-model were compared to the experimental results of FT-LAOS for checking the predictability of the model against the rheological properties. The adapted model shows some reasonable qualitative and quantitative agreements at high strain amplitude values.

A Study of the Sedimentation of a Sphere Near a Vertical Wall Using Three-Dimensional PIV

Volume 1 ◽  
2004 ◽  
Author(s):  
Graham M. Harrison ◽  
Jared A. Tatum ◽  
Nicholas J. Lawson
Keyword(s):  
Finite Element ◽  
Vertical Wall ◽  
Three Dimensional ◽  
Shear Thinning ◽  
Terminal Velocity ◽  
Velocity Fields ◽  
Boger Fluid ◽  
Numerical Predictions ◽  
Recirculation Zones ◽  
Adjacent Wall

The sedimentation of a sphere through a fluid is a standard testbed problem in non-Newtonian fluid mechanics. The experimentally determined velocity fields may be compared with numerical predictions obtained using finite element simulations. In this work, the influence of an adjacent wall, in addition to elastic and shear thinning effects, on the velocity field in the fluid surrounding the sphere is studied. Three different test fluids are employed: a Newtonian reference fluid, a constant shear viscosity (elastic) Boger fluid, and a shear thinning elastic fluid. All three fluids have similar zero shear viscosities. For all experiments, the terminal velocity is achieved before measurements begin. Significant differences in both the location and magnitude of the recirculation zones are observed for the different test fluids. In addition, the shape of the wake is qualitatively different for the various fluids.

scholarly journals Visualizations of Boger fluid flows in a 4:1 square-square contraction

AIChE Journal ◽  
2005 ◽  
Vol 51 (11) ◽  
pp. 2908-2922 ◽  
Author(s):  
M. A. Alves ◽  
F. T. Pinho ◽  
P. J. Oliveira
Keyword(s):  
Fluid Flows ◽  
Boger Fluid
Sign in / Sign up

Export Citation Format

Share Document