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Erschienen in:
2021 | OriginalPaper | Buchkapitel
Large Eddy Simulation of Turbulent Heat Transfer in Pipe Flows of Temperature Dependent Power-Law Fluids
verfasst von : Paulin Sourou Ganmbode, Meryem Ould-Rouiss, Xavier Nicolas, Paolo Orlandi
Erschienen in: Turbulence and Interactions
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Abstract
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 (\(0\!\le \!Pn\!\le \!5\)), for two power law indices (\(n\!=\!0.75\) and 1), at Reynolds and Prandtl numbers \(Re_s\!=\!4000\) and \(Pr_s\!=\!1\). 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.