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Determination of the wall slip velocity in the flow of a SBR compound

โœ Scribed by Ph. Mourniac; J. F. Agassant; B. Vergnes

Publisher
Springer-Verlag
Year
1992
Tongue
English
Weight
822 KB
Volume
31
Category
Article
ISSN
0035-4511

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โœฆ Synopsis

Rubber compounds are known to exhibit slip at the wall in particular flow conditions. The slip velocity is usually determined by using the classical Mooney method. The rheological behavior of a styrene butadiene rubber (SBR) compound was studied with three different rheometers. Biconical rotational, capillary and slit die rheometers were used to define the true viscous behavior of the compound and the slip velocity. It was shown that it was impossible to apply the Mooney method to our experimental data. New characterizations were thus developed for both capillary and slit die experiments. They were based on the dependency of the slip velocity on the local flow gap. Contrarily to the Mooney method, they provided physically acceptable results and led to a powerlaw relationship between wall slip, wall shear stress and local geometry of the flow.

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