An approximate technique to determine elongation stresses in stagnation flow

M.E.Mackay M.E.MackayM.E.Mackay M.MackayM. E. (1995) An approximate technique to determine elongation stresses in stagnation flow. Journal of Rheology, 39 1: 1-14. doi:10.1122/1.550681

Author M.E.Mackay M.E.MackayM.E.Mackay M.MackayM. E.
Title An approximate technique to determine elongation stresses in stagnation flow
Journal name Journal of Rheology
ISSN 15208516 01486055
Publication date 1995-01-01
Sub-type Article (original research)
DOI 10.1122/1.550681
Volume 39
Issue 1
Start page 1
End page 14
Total pages 14
Language eng
Subject 2500 Materials Science
3104 Condensed Matter Physics
2211 Mechanics of Materials
2210 Mechanical Engineering
Abstract A technique is presented in which approximate values of the elongation stress can be measured at large elongation rates by using opposed orifices to generate a stagnation flow similar to uniaxial elongation. The elongation rate is related to the volumetric flow rate of fluid into the orifices and the apparatus geometry. The first law of thermodynamics is simplified to relate the pressure drop due to fluid entering the orifices with the first normal stress difference in uniaxial, elongation flow. Thus only the flow rate and pressure drop are needed to determine the elongation viscosity as a function of elongation rate. Results for elongation rates up to 1000 sfor three polymer melts, linear low-density polyethylene, low-density polyethylene, and polypropylene, are presented. The technique can also be used at low elongation rates and results are presented in which the elongation viscosity approaches 3 x the zero shear viscosity.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
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Citation counts: TR Web of Science Citation Count  Cited 24 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 23 times in Scopus Article | Citations
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