Direct numerical simulation of turbulent heat transfer in pipe flows: Effect of Prandtl number
作者： L. Redjem-Saad , M. Ould-Rouiss , G. Lauriat
DOI: 10.1016/J.IJHEATFLUIDFLOW.2007.02.003
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摘要: Abstract Direct numerical simulations of heat transfer in a fully developed turbulent pipe flow with isoflux condition imposed at the wall are performed for Reynolds number based on radius Re = 5500. Main emphasis is placed Prandtl effects flow. The scaling mean temperature profiles investigated order to derive correct logarithmic law various Pr . rms fluctuations and fluxes found increase when increasing number. number, t , almost independent molecular ⩾ 0.2. radial distributions higher statistics (skewness flatness) confirm intermittent behaviour close vicinity wall; this more pronounced an Nusselt good agreement findings literature. Probability density functions joint probability velocity used describe characteristics transfer. instantaneous thermal fields plotted analyse structures. To explore impact curvature transfer, predictions were compared available results channel These comparisons show slightly intense
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