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Chapitre D'ouvrage Année : 2021

Large eddy simulation of turbulent heat transfer in pipe flows of temperature dependent power-law fluids

Résumé

Heat transfer in turbulent forced convection of power-law fluids, in a heated horizontal pipe at isoflux conditions, is analyzed by large eddy simulations (LES), with an extended Smagorinsky model. A temperature dependent fluid is studied at various Pearson numbers (0 ≤ Pn ≤ 5), for two power law indices (n = 0.75 and 1), at Reynolds and Prandtl numbers Re=4000 and Pr=1. The LES predictions are validated through comparisons with the literature at Pn=0. They allow a better understanding of the physical mechanisms involved in the non-Newtonian temperature dependent fluid flows: with increasing Pn, the relative viscosity is reduced close to the wall and enhanced towards the pipe center, reducing the turbulent fluctuations and heat transfer in the bulk and, as a consequence, the friction factor and Nusselt number.
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Dates et versions

hal-02642264 , version 1 (28-05-2020)

Identifiants

  • HAL Id : hal-02642264 , version 1

Citer

Paulin Sourou Ganmbode, Meryem Ould-Rouiss, Xavier Nicolas, Paolo Orlandi. Large eddy simulation of turbulent heat transfer in pipe flows of temperature dependent power-law fluids. M. Deville et al. (eds). Turbulence and Interactions. TI2018, 149, Springer, pp.123-129, 2021, Notes in Numerical Fluid Mechanics and Multidiscipliary Design. ⟨hal-02642264⟩
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