Equibiaxial extensional flow of polymer melts via lubricated squeezing flow. II. Flow modeling

2000 ◽  
Vol 39 (6) ◽  
pp. 574-582 ◽  
Author(s):  
David C. Venerus ◽  
M. Kompani ◽  
B. Bernstein
Keyword(s):  
Polymer Melts ◽  
Extensional Flow ◽  
Squeezing Flow ◽  
Flow Modeling ◽  
Lubricated Squeezing Flow

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

scholarly journals Reliability Engineering. Measurement of Biaxial Elongational Viscosity of Polymer Melts Using Lubricated Squeezing Flow Method.

1998 ◽  
Vol 47 (12) ◽  
pp. 1296-1300 ◽  
Author(s):  
Akihiro NISHIOKA ◽  
Yasuyuki TAKAGI ◽  
Tatsuhiro TAKAHASHI ◽  
Yuichi MASUBUCHI ◽  
Jun-ichi TAKIMOTO ◽  
...  
Keyword(s):  
Polymer Melts ◽  
Elongational Viscosity ◽  
Squeezing Flow ◽  
Reliability Engineering ◽  
Flow Method ◽  
Engineering Measurement ◽  
Lubricated Squeezing Flow

Suspensions of monodisperse spheres in polymer melts: particle size effects in extensional flow

2002 ◽  
Vol 42 (1-2) ◽  
pp. 184-190 ◽  
Author(s):  
Jean-François Le Meins ◽  
Paula Moldenaers ◽  
Jan Mewis
Keyword(s):  
Particle Size ◽  
Size Effects ◽  
Polymer Melts ◽  
Extensional Flow ◽  
Particle Size Effects ◽  
Monodisperse Spheres

Particle Fluid Separation in Shear Flow of Dense Suspensions: Experimental Measurements on Squeezed Clay Pastes

2004 ◽  
Vol 14 (5) ◽  
pp. 256-265 ◽  
Author(s):  
Nicolas Roussel ◽  
Christophe Lanos
Keyword(s):  
Extensional Flow ◽  
Fluid Pressure ◽  
Squeezing Flow ◽  
Compression Load ◽  
Permeability Function ◽  
Dense Suspensions ◽  
Simple Compression ◽  
Clay Suspensions ◽  
Fluid Separation ◽  
Water Amount

AbstractParticle fluid separation is studied in the case of slow squeezing flow of dense clay suspensions. The fluid pressure gradient generated by the test induces heterogeneity in the sample. Experimental water content measurements at different time points through the test allow the quantification of this separation phenomenon. The problem equations are written in the case of purely extensional flow. Based on Terzaghi principle, Darcy’s law and a Cam Clay type constitutive equation, the influence of the permeability function on the predicted void ratio evolution is studied. It is then shown that a certain water amount is strongly linked to the grains and cannot be extracted from the sample using simple compression. This critical water amount is then taken in account in the permeability function in order to predict the compression load through the test.

scholarly journals Recoverable Extensional Flow of Polymer Melts and Its Relevance for Processing

Polymers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1512
Author(s):  
Helmut Münstedt
Keyword(s):  
Polymer Melts ◽  
Extensional Flow ◽  
Elongational Flow ◽  
Fused Deposition Modelling ◽  
Extrudate Swell ◽  
Fused Deposition ◽  
Rigid Particles ◽  
Experimental Parameters ◽  
Slit Die

While the uniaxial elongational viscosity is widely investigated, and its relevance for processing is described in the literature, much less has been published on the recoverable extensional flow of polymer melts. This paper presents a short overview of the dependencies of the recoverable elongation on the molecular structure of a polymer, and on some experimental parameters. Its main focus lies on the discussion of processing operations and applications that are largely affected by the elastic components of elongational flow. The recoverable portions of stretched films are considered, and the exploitation of the shrinkage of films, due to the recovery of frozen recoverable deformations, and its role for applications are addressed. The analysis of measurements of velocity fields in the entry region of a slit die and results on the determination of the recoverable elongation from uniaxial experiments, according to the literature, lead to the conclusion of dominant elastic extensions. Considering these facts, the assumptions for Cogswell’s widely used method of determining elongational viscosities under processing conditions from entrance flow are not realistic. As examples of a direct application of extrudate swell from short dies for processing, pelletizing and fused deposition modelling within additive manufacturing are addressed. The special features of extrudate swell from short dies, and uniaxial recoverable elongation for a polymer filled with rigid particles in comparison to an immiscible polymer blend, are presented and discussed.

Imperfect lubricated squeezing flow viscometry for foods

1997 ◽  
Vol 36 (6) ◽  
pp. 686-693
Author(s):  
Bernhard Hoffner ◽  
Christian Gerhards ◽  
M. Peleg
Keyword(s):  
Squeezing Flow ◽  
Lubricated Squeezing Flow
Sign in / Sign up

Export Citation Format

Share Document