Shear viscosity, extensional viscosity, and die swell of polypropylene in capillary flow with pressure dependency

2002 ◽  
Vol 84 (6) ◽  
pp. 1269-1276 ◽  
Author(s):  
Jan-Chan Huang ◽  
Kim-Sweet Leong
Keyword(s):  
Shear Viscosity ◽  
Capillary Flow ◽  
Extensional Viscosity ◽  
Die Swell ◽  
Pressure Dependency

scholarly journals Correlation between in-line measurements of tomato ketchup shear viscosity and extensional viscosity

2016 ◽  
Vol 173 ◽  
pp. 8-14 ◽  
Author(s):  
Marco Berta ◽  
Johan Wiklund ◽  
Reinhardt Kotzé ◽  
Mats Stading
Keyword(s):  
Shear Viscosity ◽  
Extensional Viscosity ◽  
Tomato Ketchup

Extensional Properties of Coating Colors at High Strain Rates

2003 ◽  
Author(s):  
Alfa Arzate ◽  
Gabriel Ascanio ◽  
Pierre J. Carreau ◽  
Philippe A. Tanguy
Keyword(s):  
Shear Viscosity ◽  
High Speed ◽  
High Strain ◽  
Newtonian Fluids ◽  
Extensional Viscosity ◽  
Strain Rates ◽  
High Strain Rates ◽  
Paper Coating ◽  
Trouton Ratio ◽  
The Relationship

Paper coating fluids also called colors are concentrated aqueous suspensions composed mainly of mineral pigments, thickeners, binders and dispersing agents. They are applied onto moving paper web for improving the optical and printing properties. Roll coating is one of the most used technologies for paper coating, however jet coating is currently a promising technology for high-speed processes. Coating colors are submitted to high strain rates in both roll or jet coaters, therefore the extensional viscosity plays a major role in the process. An orifice flowmeter was used for measuring the extensional properties of complex rheology fluids such as coating colors. The principle of this flowmeter is based on the relationship between pressure drop and the flow rate of fluid passing through a small orifice. The flowmeter was firstly calibrated in terms of a dimensionless Euler number as a function of the Reynolds number with Newtonian fluids. The calibration curve was then used to determine the apparent extensional viscosity of coating colors. Results of extensional properties of paper coating colors are presented and compared to shear viscosity. The ratio of extensional to shear viscosity (Trouton ratio) for some coating colors was shown to exceed considerably the theoretical value of 3 expected for Newtonian fluids.

scholarly journals Capillary Flow and Shear Viscosity of Ferroelectric Liquid Crystal

2018 ◽  
Vol 18 (4) ◽  
pp. 88-94
Author(s):  
D. V. Shmeliova ◽  
E. P. Pozhidaev ◽  
S. S. Kharlamov ◽  
S. V. Pasechnik ◽  
V. A. Barbashov ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Shear Viscosity ◽  
Capillary Flow ◽  
Ferroelectric Liquid Crystal

Effect of Shear Rate and Nanoclay Content on the Die Swell of Polypropylene Nanocomposites Extruded Under Capillary Flow

2010 ◽  
Author(s):  
Tripti Dixit ◽  
Vishal Das ◽  
Vineeta Nigam ◽  
A. K. Pandey ◽  
P. K. Giri ◽  
...  
Keyword(s):  
Shear Rate ◽  
Capillary Flow ◽  
Die Swell ◽  
Polypropylene Nanocomposites ◽  
Nanoclay Content

Polymer Melt Rheological Property Measurement in a Novel Composite-Geometry Flow Rheometer

1986 ◽  
Vol 200 (5) ◽  
pp. 325-334 ◽  
Author(s):  
C A M Humphries ◽  
J Parnaby
Keyword(s):  
Shear Viscosity ◽  
Measurement Errors ◽  
Flow Analysis ◽  
Polymer Melt ◽  
Extensional Viscosity ◽  
Significant Advance ◽  
Capillary Viscometer ◽  
Pressure Data ◽  
In Series ◽  
Shear Compliance

A novel rheometer is described, in which extensional viscosity and elastic shear compliance are determined simultaneously from pressure measurements taken on steady state polymer melt flows through an open-ended die with successive, similarly shaped, converging and diverging zones. Equations incorporating practically realistic simplifying approximations are developed for the calculation of extensional viscosity and shear compliance from the measured pressure data. The construction of a prototype rheometer is described, and results from its operation are presented. Agreement between these results and published melt elasticity data for a low-density polyethylene material gives evidence to confirm the basic rheometric principle and flow analysis. The implications of pressure measurement errors are discussed. Assembly of the new composite-geometry rheometer in series with a conventional capillary viscometer would give in-line shear viscosity characterization simultaneously and facilitate on-line processing of pressure data from the converging and diverging flows by microcomputer to provide complete characterizations for practical use in polymer process machinery design. The work represents a significant advance on the basic empirical power law modelling process used for many years by practising engineers to represent shear viscosity phenomena as a basis for design. No other methodology is currently available to suit the engineer.

Sign in / Sign up

Export Citation Format

Share Document