Numerical simulation of the transition of a Newtonian fluid to a viscoplastic state in a turbulent flow
Pakhomov M.A. Zhapbasbayev U.K. Zh. Bossinov D.
February 2023Elsevier B.V.
Journal of King Saud University - Science
2023#35Issue 2
The non-isothermal turbulent flow and transition to a viscoplastic state of high-viscosity oil with physical and chemical properties depending on fluid temperature is numerically studied. The turbulence of fluid flow in a pipe is described using the Reynolds stress, Reynolds algebraic stress, and two-parameter isotropic models. The simulations show the boundaries of the region of the manifestation of Newtonian behavior and fluid transition to a viscoplastic state. The Reynolds stress model and the algebraic Reynolds stress model show significant anisotropy in the velocity fluctuation profiles of Newtonian and non-Newtonian fluids. The shift of the locus of maximal magnitudes of turbulent pulsations, Reynolds stress, and turbulent kinetic energy towards a flow core region is observed. The height of the zone with a completely stopped fluid is predicted and determined numerically. The appearance of a stagnation zone near the wall causes a significant decrease in wall friction and heat transfer due to a decrease in the environment temperature.
Bingham-Schwedoff model , Heat transfer , High-viscosity oil , Non-isothermal flow , Reynolds stress model , Turbulence
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Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Science, Lavrentev Ave., 1, Novosibirsk, 630090, Russian Federation
Satbayev University, 050013, Satpaev str, 22a, Almaty, Kazakhstan
Kutateladze Institute of Thermophysics
Satbayev University
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