On the modeling of fluidity loss phenomena in Couette and Poiseuille flows of elastic liquids |
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Authors: | A I Leonov A Srinivasan |
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Institution: | (1) Institute of Polymer Engineering, The University of Akron, Akron, Ohio, USA;(2) Institute of Polymer Engineering, The University of Akron, 44325-0301 Akron, Ohio, USA |
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Abstract: | Some effects of the possible relaxation transition from viscoelastic liquid state to highly elastic solid state were theoretically and numerically investigated in the shear situations, within the approach proposed in papers 1, 2, 5, 16]. It was found that for a single Maxwellian model the constitutive equations developed in 1, 2, 5] are not valid at elevated shear stresses. Some new aspects of the possible rheological behavior of elastic liquids in subcritical (before transition) and supercritical (after transition) regimes were demonstrated. The mechanism of fluidity loss studied in this paper could serve as a possible trigger mechanism for the melt flow instabilities. |
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Keywords: | Fluidity loss melt fracture instability plane Couette flow Poiseuille flow |
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