RANS predictions of turbulent non-isothermal viscoplastic fluid in pipe with sudden expansion
Pakhomov M.A. Zhapbasbayev U.K.
December 2024Elsevier B.V.
Journal of Non-Newtonian Fluid Mechanics
2024#334
A transition of Newtonian turbulent fluid to viscoplastic non-Newtonian fluid by cooling in a pipe with a sudden expansion is numerically studied. A recirculation region with negative velocities appears for fluid velocity profiles corresponding to the zone of flow recirculation. A small corner eddy disappears for a non-Newtonian fluid. Significant anisotropy between axial and radial components of Reynolds stresses is numerically shown. The heat transfer distributions along the pipe surface for turbulent non- and Newtonian fluids are qualitatively similar. The peak of heat transfer is shifted upstream in the Schwedoff-Bingham fluid in comparison with the Newtonian one. Authors’ numerical predictions are compared with numerical simulations by other authors for turbulent Schwedoff-Bingham fluids.
Non-isothermal flow , RANS , Reynolds stress model , Sudden pipe expansion , Viscoplastic fluid , Yield stress
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Kutateladze Institute of Thermophysics SB RAS, Lavrentyev Ave., 1, Novosibirsk, 630090, Russian Federation
Satbayev University, Satbayev str, 22a, Almaty, 050013, Kazakhstan
Kutateladze Institute of Thermophysics SB RAS
Satbayev University
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