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Article Dans Une Revue Desalination and Water Treatment Année : 2022

Large eddy simulation of turbulent flow of pseudoplastic and dilatant fluids: rheological and hydrodynamic behaviour

Résumé

A fully developed turbulent pipe flow of non-Newtonian fluids was investigated numerically using the large eddy simulation (LES) method. The present investigation mainly focuses on the rheological and hydrodynamic behaviour of the pseudoplastic (shear-thinning) and dilatant (shear-thickening) fluids over a wide range of flow behaviour indexes 0.75, 0.8, 1, 1.2, 1.4, and 1.6 at a simulation Reynolds number of 12,000. The computations are based on a finite difference scheme, secondorder accurate in space and time. The numeric resolution is 65 3 grid points in r, θ and z directions, respectively. According to the results, the shear rate profiles of the pseudoplastic decreased while the dilatant fluid improved with a higher flow index along the pipe radius. Additionally, the elevated flow index caused a rise in the fluid viscosity close to the wall, which raised the friction factor.
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Dates et versions

hal-04075461 , version 1 (07-06-2023)

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Mohamed Abdi, Khaled Chaib, Meryem Ould-Rouiss, Slimane Benferhat. Large eddy simulation of turbulent flow of pseudoplastic and dilatant fluids: rheological and hydrodynamic behaviour. Desalination and Water Treatment, 2022, 279, pp.85 - 89. ⟨10.5004/dwt.2022.29073⟩. ⟨hal-04075461⟩
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