Please use this identifier to cite or link to this item:
https://hdl.handle.net/20.500.14279/15785
Title: | A nonequilibrium thermodynamics perspective of thixotropy | Authors: | Stephanou, Pavlos S. Georgiou, Georgios G. |
Major Field of Science: | Engineering and Technology | Field Category: | Chemical Engineering | Keywords: | Blood;Constitutive equations;Shear deformation;Shear flow;Viscoplasticity;Yield stress | Issue Date: | 28-Dec-2018 | Source: | Journal of Chemical Physics, 2018, vol. 149, no. 24 | Volume: | 149 | Issue: | 24 | Journal: | Journal of Chemical Physics | Abstract: | 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 |
Appears in Collections: | Άρθρα/Articles |
Files in This Item:
File | Description | Size | Format | |
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stephanou a nonequilibrium.pdf | Open access | 2.46 MB | Adobe PDF | View/Open |
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