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Elongational viscosity of LDPEs and polystyrenes using entrance loss data
Author(s) -
Walczak K.,
Gupta M.,
Koppi K.A.,
Dooley J.,
Spalding M.A.
Publication year - 2008
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.20818
Subject(s) - materials science , viscosity , rheometer , capillary action , thermodynamics , experimental data , mechanics , range (aeronautics) , composite material , rheology , physics , mathematics , statistics
For two low‐density polyethylenes and two polystyrenes, axisymmetric and planar elongational viscosities are estimated using entrance loss data from capillary and slit rheometers, respectively. The elongational viscosity is estimated by optimizing the values of various parameters in the Sarkar–Gupta elongational viscosity model such that the entrance loss predicted by a finite element simulation agrees with the corresponding experimental data. The predicted entrance loss is in good agreement with the experimental data at high flow rates. The difference in the experimental and predicted entrance loss at lower flow rates might have been caused by large error in the experimental data in this range. POLYM. ENG. SCI., 2008. © 2007 Society of Plastics Engineers