Capillary Instabilities Induced by Temperature Gradients
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Control of the sharkskin instability in the extrusion of polymer melts using induced temperature gradients
Flow instabilities occur in a variety of commercial polymer processing operations including extrusion, film blowing, fiber spinning and coating. During the extrusion of molten polymer through capillary or slit die geometries, a transition from a smooth surface to a nearly periodic ridge-like surface distortion has been observed at a critical shear rate or wall shear stress (Petrie and Denn 1976...
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