Behaviour of a simple crystallisation model in tube and channel flow |
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Authors: | Roger I. Tanner Chitiur Hadinata Duane LeeWo |
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Affiliation: | (1) School of Aerospace, Mechanical and Mechatronic Engineering, University of Sydney, Sydney, 2006, Australia;(2) Moldflow Pty Ltd, Kilsyth, Vic, 3137, Australia |
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Abstract: | A formulation describing the rheology of crystallising polymers is discussed. For some semi-crystalline polymers where spherulites form as part of the crystallisation process, the use of a suspension-type model is appropriate. Whilst it is possible to so describe simple shearing and elongational rheology during on-going crystallisation with such models, the flow through a capillary tube is much more complex and numerical solution is usually necessary. To give some insight into this complex flow, a ‘step function’ or ‘amorphous-frozen’ model of the viscosity changes due to crystallisation has been devised so that a semi-analytical approach is feasible. We use this simple model and compare the results with recently published experiments in tubes and channels at high (O(103 s − 1)) shear rates using poly(butene-1). A direct correlation between simple shear and tube flow crystallisation onset times is found. |
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Keywords: | Shear-induced crystallisation Tube flow Poly(butene-1) Amorphous-frozen model |
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