We consider a nonlinear three-dimensional viscoelastic fiber jet that is generated during a
forcespinning process. We provide a particular case for such a rotating jet at a high rotation
rate. We use a viscoelastic constitutive model for the jet equations and then applying a
new slender body approach, we continue with proper scaling and perturbation technique to
develop a new model for such a jet system. We find that the profiles for jet quantities versus
arc length are notably different from all those in related studies reported before for either
high or low rotation rates. In particular, jet radius first rapidly decreases as the arc length
decreases and then reaches its macro- or nano-scale size not far away from its exit section.
The present model can predict a nano-fiber jet that is entirely based on proper scaling,
perturbation technique and full fluid mechanics laws and equations.
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