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Rheology of thixotropic dispersions. Transient phenomena with increasing shear rate
- Authors: Matveenko V.N.1,2, Kirsanov E.A.1,3
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Affiliations:
- M. V. Lomonosov Moscow State University, Department of Chemistry
- State Social and Humanitarian University
- State Social and Humanitarian University, Kolomna
- Issue: Vol 99, No 4 (2025)
- Pages: 595-604
- Section: STRUCTURE OF MATTER AND QUANTUM CHEMISTRY
- Submitted: 22.08.2025
- Published: 15.04.2025
- URL: https://bakhtiniada.ru/0044-4537/article/view/305551
- DOI: https://doi.org/10.31857/S0044453725040086
- EDN: https://elibrary.ru/fpbolq
- ID: 305551
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Abstract
A structural rheological model is used to describe the thixotropic dispersed system of silicon dioxide in oil. The model includes a kinetic equation of the processes of formation and destruction of particle aggregates and a rheological equation containing a structural parameter (the number of aggregated particles in a unit volume). The case of an equilibrium plastic flow, which corresponds to experimental flow curves, is considered. The coefficients of the rheological equation are calculated. For a stepwise increase in the shear rate from γ1 to γ2, the transient process is considered as a transition from one equilibrium state of the flow to another equilibrium state through a certain nonequilibrium state of the flow. The coefficient of deviation from equilibrium is introduced, and its dependence ζ(t) is calculated using exponential functions; the limiting value ζ0 is determined. The transient dependences τ1/2(t) are approximated.
About the authors
V. N. Matveenko
M. V. Lomonosov Moscow State University, Department of Chemistry; State Social and Humanitarian University
Email: 13121946VNM@gmail.com
Moscow, Russia; Kolomna, Moscow Region, 140411 Russia
E. A. Kirsanov
M. V. Lomonosov Moscow State University, Department of Chemistry; State Social and Humanitarian University, Kolomna
Email: Kirsanov47@mail.ru
Moscow, Russia; Kolomna, Moscow Region, 140411 Russia
References
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- Кирсанов Е.А., Матвеенко В.Н. Вязкость и упругость структурированных жидкостей: монография М.: Техносфера, 2022. 284 с. [Kirsanov E.A., Matveenko V.N. Viscosity and elasticity of structured liquids. Moscow: Technosphere, 2022, 284 p. (in Russ.)].
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