Measurement of Stresses Developed in Steady Laminar Shearing Flows of Viscoelastic Media
作者:
R. F. Ginn,
A. B. Metzner,
期刊:
Transactions of the Society of Rheology
(AIP Available online 1969)
卷期:
Volume 13,
issue 4
页码: 429-453
ISSN:0148-6055
年代: 1969
DOI:10.1122/1.549138
出版商: The Society of Rheology
数据来源: AIP
摘要:
The shearing stress and both normal stress differences are reported for three solutions of polyisobutylene in decalin. The ratio of the second normal stress difference to the first,(P22−P33)/(P11−P22),is seen to be negative and to vary between −0.1 and −0.4 under the conditions studied for these media. The statistical significance and the precision of these data is considered in some detail; the results are believed to be definitive at the error levels specified. Previous measurements of this normal stress ratio, which may be shown to be free of all the major known errors, are seen to have yielded the same sign as obtained herein, for similar fluids.
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