Measurement and modeling of uniaxial and planar extensional viscosities for linear isotactic polypropylenes
In this work, novel rectangular and circular orifice (zero-length) dies were used to measure planar and uniaxial extensional viscosities as a function of strain rate for various linear isotactic polypropylene melts by using Cogswell methodology. The obtained experimental data were combined with shea...
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Published in | Physics of fluids (1994) Vol. 35; no. 1 |
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Format | Journal Article |
Language | English |
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American Institute of Physics
01.01.2023
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Abstract | In this work, novel rectangular and circular orifice (zero-length) dies were used to measure planar and uniaxial extensional viscosities as a function of strain rate for various linear isotactic polypropylene melts by using Cogswell methodology. The obtained experimental data were combined with shear and uniaxial extensional viscosity data determined at very high strain rates. The ability of the molecularized generalized Newtonian fluid (mGNF) [M. Zatloukal and J. Drabek, “Generalized Newtonian fluid constitutive equation for polymer liquids considering chain stretch and monomeric friction reduction for very fast flows modeling,” Phys. Fluids 33(8), 083106 (2021)], Giesekus, and explicit Yao constitutive equations to describe the measured data was tested. It has been shown that including the effect of the chemical environment (i.e., the role of the oligomeric solvent) using a simplified version of the mGNF constitutive equation (instead of the commonly used Newton's law) can significantly improve the ability of the Giesekus and Yao viscoelastic constitutive equations to describe the measured experimental data, especially at very high strain rates with using adjustable parameters with a clear physical meaning. |
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AbstractList | In this work, novel rectangular and circular orifice (zero-length) dies were used to measure planar and uniaxial extensional viscosities as a function of strain rate for various linear isotactic polypropylene melts by using Cogswell methodology. The obtained experimental data were combined with shear and uniaxial extensional viscosity data determined at very high strain rates. The ability of the molecularized generalized Newtonian fluid (mGNF) [M. Zatloukal and J. Drabek, “Generalized Newtonian fluid constitutive equation for polymer liquids considering chain stretch and monomeric friction reduction for very fast flows modeling,” Phys. Fluids 33(8), 083106 (2021)], Giesekus, and explicit Yao constitutive equations to describe the measured data was tested. It has been shown that including the effect of the chemical environment (i.e., the role of the oligomeric solvent) using a simplified version of the mGNF constitutive equation (instead of the commonly used Newton's law) can significantly improve the ability of the Giesekus and Yao viscoelastic constitutive equations to describe the measured experimental data, especially at very high strain rates with using adjustable parameters with a clear physical meaning. |
Author | Zatloukal, Martin Drabek, Jiri |
Author_xml | – sequence: 1 givenname: Jiri surname: Drabek fullname: Drabek, Jiri organization: Polymer Centre, Faculty of Technology, Tomas Bata University in Zlin, Vavreckova 5669, 760 01 Zlin, Czech Republic – sequence: 2 givenname: Martin surname: Zatloukal fullname: Zatloukal, Martin organization: Polymer Centre, Faculty of Technology, Tomas Bata University in Zlin, Vavreckova 5669, 760 01 Zlin, Czech Republic |
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SubjectTerms | Constitutive equations Constitutive relationships Friction reduction High strain rate Isotacticity Mathematical models Modelling Newton Theory Newtonian fluids Orifices Polypropylene |
Title | Measurement and modeling of uniaxial and planar extensional viscosities for linear isotactic polypropylenes |
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