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https://hdl.handle.net/20.500.14279/15785
Τίτλος: | A nonequilibrium thermodynamics perspective of thixotropy | Συγγραφείς: | Stephanou, Pavlos S. Georgiou, Georgios G. |
Major Field of Science: | Engineering and Technology | Field Category: | Chemical Engineering | Λέξεις-κλειδιά: | Blood;Constitutive equations;Shear deformation;Shear flow;Viscoplasticity;Yield stress | Ημερομηνία Έκδοσης: | 28-Δεκ-2018 | Πηγή: | Journal of Chemical Physics, 2018, vol. 149, no. 24 | Volume: | 149 | Issue: | 24 | Περιοδικό: | Journal of Chemical Physics | Περίληψη: | We propose a new description of elasto-viscoplastic fluids by relating the notion of thixotropy directly to internal viscoelasticity and network structures through a general, thermodynamically consistent approach. By means of non-equilibrium thermodynamics, a thermodynamically admissible elasto-viscoplastic model is derived which introduces self-consistently and effortlessly thixotropic effects and reproduces at both low and high shear rates experimental data usually fitted with empirical constitutive equations, such as the Bingham and Herschel-Bulkley models. The predictions of the new model are in very good agreement with available steady-state shear rheological data for soft colloidal pastes and blood, i.e., systems exhibiting a yield stress, and with time-dependent rheological data for blood, i.e., during a triangular time-dependent change in the shear rate, exhibiting a hysteresis. The proposed approach is expected to provide the means to improve our understanding of thixotropic fluids. | URI: | https://hdl.handle.net/20.500.14279/15785 | ISSN: | 00219606 | DOI: | 10.1063/1.5049397 | Rights: | © Author(s). | Type: | Article | Affiliation: | University of Cyprus University of Patras Cyprus University of Technology |
Publication Type: | Peer Reviewed |
Εμφανίζεται στις συλλογές: | Άρθρα/Articles |
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stephanou a nonequilibrium.pdf | Open access | 2.46 MB | Adobe PDF | Δείτε/ Ανοίξτε |
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