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Determination of pressure drop for concentrated suspension in a capillary flow

✍ Scribed by Zhi Ying Wang; Yee Cheong Lam; Sunil C. Joshi; Xing Chen

Publisher
Society for Plastic Engineers
Year
2009
Tongue
English
Weight
186 KB
Volume
31
Category
Article
ISSN
0272-8397

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✦ Synopsis

Abstract

The rheological behavior of concentrated suspension melts in a capillary die is investigated. Particle migration and wall slip are two major factors affecting the flow behavior. A numerical model is proposed to describe the coupling effect of particle migration and wall slip in a capillary tube flow, incorporating a power‐law model for binder viscosity and a concentrated suspension viscosity model proposed by Krieger. Wall slip of a non‐Newtonian concentrated suspension is characterized by a modified Mooney method for which the conventional Mooney method is not applicable. We characterized the flow behavior of a concentrated suspension of a non‐Newtonian binder, EVA 460 (ethylene vinyl acetate), mixed with spherical glass beads of 40% by volume. Predicted results were compared with experimental observations, with good agreement. POLYM. COMPOS., 2010. Β© 2009 Society of Plastics Engineers

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Viscosity corrections for concentrated s
Viscosity corrections for concentrated suspension in capillary flow with wall slip
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## Abstract Corrections for viscosity measurements of concentrated suspension with capillary rheometer experiments were investigated. These corrections include end effects, Rabinowitsch effect, and wall slip. The effects of temperature, particle concentration, and contraction ratio on the end effec

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The effects of wall slip of concentrated suspension melts in capillary flows were investigated at elevated temperature. The modeled material is a mixture of polymer EVA (Ethylene Vinyl Acetate) and non-colloidal spherical powder (glass microspheres) with mean particle size within 53∼63 μm. The effec