An assessment of cogswell's method for measurement of extensional viscosity Journal Articles

abstract

• AbstractCogswell's method for measurement of extensional viscosity by determining the entry pressure loss in capillary viscometry is critically examined. Comparisons are made between extensional viscosity values introduced in finite element calculations as input data and predictions based on the calculated entry pressure losses for polymer melts. The calculated pressure losses are in good agreement with experimental data by Laun and Schuch. An equation proposed by Cogswell and another by Binding are used in the extensional viscosity comparisons. The slope of the extensional viscosity versus stretch rate is predicted rather well, but the calculations can shift the results above or below the true values.

authors

• Kwag, C
• Vlachopoulos, John

status

• published 

publication date

• July 1991

has subject area

• 0303 Macromolecular and Materials Chemistry (FoR)
• 0904 Chemical Engineering (FoR)
• 0912 Materials Engineering (FoR)
• Polymers (Science Metrix)

published in

• Polymer Engineering and Science  Journal

keywords

• BULK MOLDING COMPOUND
• CONTRACTION
• CONVERGING FLOW
• ELONGATIONAL VISCOSITY
• Engineering
• Engineering, Chemical
• NORMAL STRESSES
• POLYMER MELTS
• PRESSURE LOSSES
• Physical Sciences
• Polymer Science
• REINFORCED-PLASTICS
• SHEAR
• Science & Technology
• Technology
• VORTEX GROWTH

Digital Object Identifier (DOI)

• 10.1002/pen.760311404

start page

• 1015

end page

• 1021

volume

• 31

issue

• 14