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The Measurement of the Elongational Viscosity of Polymer Solutions Using a Viscometer of Novel Design
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1974
Year
EngineeringFluid MechanicsMechanical EngineeringNovel DesignBiomedical EngineeringRheological MeasurementMechanicsPrototype ViscometerElongational ViscosityExperimental MechanicRheologyPolymer ChemistryMaterials SciencePolymer SolutionsFilament RadiusThread TensionRheological Constitutive EquationViscoplastic FluidPolymer SolutionPolymer ScienceRheological PropertyPolymer CharacterizationPolymer PropertyMechanics Of Materials
A prototype viscometer of novel design is described. Experiments using the viscometer with solutions of polybutadiene in decalin were carried out, and measurements were taken of thread tension and filament radius. Using a force-balance equation, these results were used to evaluate the axial stresses in the filament. The effects of gravity, inertia, aerodynamic drag, and stress history on the elongational viscosity are shown. The results are discussed in the light of previous experimental results and theoretical predictions of the elongational viscosity.