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Article Dans Une Revue Desalination and Water Treatment Année : 2022

Large eddy simulation investigation of Reynolds number effects on rheological behavior of Ostwald de Waele fluids

Résumé

A fully developed turbulent pipe flow of non-Newtonian fluids was investigated numerically using the large eddy simulation (LES) method. The rheological and hydrodynamic behaviour of the power-law fluids was a primary focus for flow behaviour indexes of 0.75, 1, and 1.4 and at simulation Reynolds numbers of 4,000; 8,000 and 12,000. The calculations utilised a finite difference method with a numerical resolution of 65 3 grid points in the r, θ and z dimensions, respectively. They were second-order accurate in space and time. According to the results, the shear rate profiles throughout the pipe radius for the pseudoplastic and dilatant fluids noticeably decreased and improved with a higher flow index. Additionally, the elevated flow index caused a notable rise in the fluid viscosity close to the wall, which raised the friction factor.
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Dates et versions

hal-04075443 , version 1 (07-06-2023)

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Mohamed Abdi, Meryem Ould-Rouiss, Manel Ait Yahia, Amina Ould Mohamed. Large eddy simulation investigation of Reynolds number effects on rheological behavior of Ostwald de Waele fluids. Desalination and Water Treatment, 2022, 279, pp.168 - 172. ⟨10.5004/dwt.2022.29104⟩. ⟨hal-04075443⟩
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