Linear and nonlinear shear flow behavior of monodisperse polyisoprene melts with a large range of molecular weights

2008 ◽  
Vol 52 (3) ◽  
pp. 801-835 ◽  
Author(s):  
Dietmar Auhl ◽  
Jorge Ramirez ◽  
Alexei E. Likhtman ◽  
Pierre Chambon ◽  
Christine Fernyhough
Keyword(s):  
Shear Flow ◽  
Large Range ◽  
Flow Behavior ◽  
Molecular Weights ◽  
Linear And Nonlinear ◽  
Nonlinear Shear

scholarly journals Shear flow behavior and dynamic viscosity of few-layer graphene nanofluids based on propylene glycol-water mixture

2020 ◽  
Vol 316 ◽  
pp. 113875 ◽  
Author(s):  
Samah Hamze ◽  
David Cabaleiro ◽  
Thierry Maré ◽  
Brigitte Vigolo ◽  
Patrice Estellé
Keyword(s):  
Shear Flow ◽  
Propylene Glycol ◽  
Dynamic Viscosity ◽  
Flow Behavior ◽  
Water Mixture ◽  
Layer Graphene ◽  
Few Layer Graphene

Comparison of three rheological models of shear flow behavior studied on blood samples from post-infarction patients

2007 ◽  
Vol 45 (9) ◽  
pp. 837-844 ◽  
Author(s):  
Anna Marcinkowska-Gapińska ◽  
Jacek Gapinski ◽  
Waldemar Elikowski ◽  
Feliks Jaroszyk ◽  
Leszek Kubisz
Keyword(s):  
Shear Flow ◽  
Flow Behavior ◽  
Rheological Models ◽  
Blood Samples

Shear flow behavior of a dynamically symmetric polymeric bicontinuous microemulsion

2007 ◽  
Vol 51 (5) ◽  
pp. 1027-1046 ◽  
Author(s):  
Ning Zhou ◽  
Frank S. Bates ◽  
Timothy P. Lodge ◽  
Wesley R. Burghardt
Keyword(s):  
Shear Flow ◽  
Flow Behavior ◽  
Bicontinuous Microemulsion

Shear Flow Analysis of Nanosize Particle Flow Behavior Using Kinetic Theory

2005 ◽  
Vol 277-279 ◽  
pp. 939-944
Author(s):  
Hae Ryung Kim ◽  
Jaihyun Seu ◽  
Hamid Arastoopour
Keyword(s):  
Shear Flow ◽  
Kinetic Theory ◽  
Flow Behavior ◽  
Flow Analysis ◽  
Particle Diameter ◽  
Particle Flow ◽  
Particle Collision ◽  
Simple Shear Flow ◽  
Particle Force ◽  
Nanosize Particle

Nanosize particle flow is significantly affected by inter-particle force. Due to the inter-particle force, the most significant characteristic of nanosize particle flow may become the formation of agglomerates or clusters which considerably affects the flow patterns. The formation of agglomerates or clusters results in a reduction in the number and an increase in the size of particles, both of which directly affect the frequency of inter-particle collisions and, in turn, the particle phase properties such as viscosity and pressure, as well as gas/particle drag force in gas/particle flow systems. In this present work, we focus our attention on the verification of nanosize particle flow behavior due to the formation of agglomerates or clusters under different fluctuation of flow and inelasticity of particle collision. By extending the application of the cohesive model using kinetic theory to nanosize particle flow system, we performed the homogeneous simple shear flow analysis using various fluctuation energy and restitution coefficient. The predicted flow properties, such as particle diameter growth, agreed well with the expected trends.

WALL SLIPPAGE IN HIGH-PRESSURE CAPILLARY VISCOMETRY: EFFECTS OF MOLECULAR WEIGHT, COMPOUND COMPOSITION, AND CAPILLARY SURFACE COATING

2019 ◽  
Vol 92 (1) ◽  
pp. 186-197
Author(s):  
Katja Putzig ◽  
E. Haberstroh ◽  
B. Klie ◽  
U. Giese
Keyword(s):  
High Pressure ◽  
Shear Stress ◽  
Wall Shear Stress ◽  
Flow Behavior ◽  
Polymer Melt ◽  
Capillary Viscometer ◽  
Molecular Weights ◽  
Rubber Compounds ◽  
Wall Shear ◽  
Wall Slippage

ABSTRACT Flow behavior is of major importance in the extrusion processing of rubber compounds. It is evaluated by means of a series of tests on a high-pressure capillary viscometer (HCV). Adhesion between the polymer melt and the capillary wall is assumed in all current calculation models, although such adhesion does not always pertain to the case of rubber compounds. To date, no uniform model discussed in the literature on the topic extensively describes the wall slippage behavior of rubber compounds. The phenomenon of wall slippage is analyzed by determining the power-law parameters n (flow exponent) and K (consistency factor) from the flow curve in the subcritical flow range. This makes it possible to explicitly calculate first the slip velocity and then the slippage ratio relative to the total volume flow as a function of the given shear rate and temperature. The work is based on the testing of EPDM raw polymers of different molecular weights in the HCV. In addition, EPDM compounds containing either a carbon black or a softener were analyzed with regard to their flow behavior. The rheological analysis was carried out on three variously coated flow channels. It was observed that with attainment of a critical wall shear stress, the wall slippage effect becomes more pronounced; thus, occurrences of flow anomalies such as slip-stick or shark-skin significantly influence processing and flow behavior. Wall slippage effects are noticeable, however, even before the critical wall shear stress is attained.

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