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Abstract
Jet flow of a 19% liquid-crystalline solution of poly-(p-phenylene terephthalamide) is modeled with a viscoelastic medium with the same relaxation time and viscous flow obeying a power law. Equations are reported for calculating the jet flow rate profile in the case of a power or logarithmic dependence of the modulus of hyperelasticity on the tensile stress. It is shown that the change in the viscosity along the length of the jet is extremal in character with a high jet draw ratio. A hypothesis is advanced concerning the dependence of stabilization of flow on the resonance in drawing of the jet with the conditions of appearance of the extremal character of the viscosity dependence along the length of the jet.
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