Abstract
We assess some of the main parameters affecting the performance of Centrifugal Spinning (CS), a method for making nanofibres, using laboratory experiments and modelling. Rheologically characterized polymer solutions of various concentrations are propelled into curved jet trajectories by an in-house CS device and they are visualized via high speed imaging, while final dried fibre morphology diameter distributions are characterized by scanning electron microscopy. Our experiments provide validations of a comprehensive string model, based on the viscoelastic upper convected Maxwell (UCM) constitutive equation for the polymer, allowing us to examine dependence of the CS process on the key dimensionless numbers. We experimentally analyze the effects of the polymer concentration, rotation speed, nozzle diameter, spinneret radius and nozzle angle, and correspondingly use the model to analyze the effects of the Weissenberg number (Wi), Rossby number (Rb), nozzle diameter ratio (ϵa0), spinneret radius ratio (ϵs0), and nozzle angle (α0) on the fibre trajectory and radius. Finally, we use a simple scaling analysis to classify the flow regimes into stable and unstable with respect to jet instabilities and breakup. The results of this analysis agree with the experiments in finding fibres stable at large capillary and Weissenberg numbers.
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