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https://hdl.handle.net/20.500.14279/15792
Τίτλος: | Communication: Appearance of undershoots in start-up shear: Experimental findings captured by tumbling-snake dynamics | Συγγραφείς: | Stephanou, Pavlos S. Schweizer, Thomas Kröger, Martin |
Major Field of Science: | Engineering and Technology | Field Category: | Chemical Engineering | Λέξεις-κλειδιά: | Chains;Polymer melts | Ημερομηνία Έκδοσης: | 28-Απρ-2017 | Πηγή: | Journal of Chemical Physics, 2017, vol. 146, no. 16 | Volume: | 146 | Issue: | 16 | Περιοδικό: | Journal of Chemical Physics | Περίληψη: | Our experimental data unambiguously show (i) a damping behavior (the appearance of an undershoot following the overshoot) in the transient shear viscosity of a concentrated polymeric solution, and (ii) the absence of a corresponding behavior in the transient normal stress coefficients. Both trends are shown to be quantitatively captured by the bead-link chain kinetic theory for concentrated polymer solutions and entangled polymer melts proposed by Curtiss and Bird, supplemented by a non-constant link tension coefficient that we relate to the nematic order parameter. The observed phenomena are attributed to the tumbling behavior of the links, triggered by rotational fluctuations, on top of reptation. Using model parameters deduced from stationary data, we calculate the transient behavior of the stress tensor for this “tumbling-snake” model after startup of shear flow efficiently via simple Brownian dynamics. The unaltered method is capable of handling arbitrary homogeneous flows and has the promising capacity to improve our understanding of the transient behavior of concentrated polymer solutions. | URI: | https://hdl.handle.net/20.500.14279/15792 | ISSN: | 00219606 | DOI: | 10.1063/1.4982228 | Rights: | © Author(s) | Type: | Article | Affiliation: | University of Cyprus Polymer Physics Cyprus University of Technology |
Εμφανίζεται στις συλλογές: | Άρθρα/Articles |
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stephanou pavlos communication.pdf | Full text | 2.28 MB | Adobe PDF | Δείτε/ Ανοίξτε |
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