DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf
ISBN Print: 978-1-56700-229-4
ISSN: 2377-2816
Prandtl number Effect on Turbulence Quantities through High Spatial Resolution DNS of Turbulent Heat Transfer in a Channel Flow
SINOPSIS
Direct numerical simulation (DNS, hereafter) of turbulent heat transfer in a channel flow through high spatial resolution has been carried out for a Reynolds number of 180, which is based on the friction velocity and the channel half width. The thermal boundary condition is uniform heat flux heating from both the walls. The molecular Prandtl numbers are set to be 0.71, 1.0, 2.0 and 10.0. The Prandtl number effect on the turbulence quantities such as the mean temperature, the time scale ratio, the skewness and flatness factors of temperature derivatives and the turbulent Prandtl number are examined. Moreover, the one-dimensional pre-multiplied energy spectrum of temperature fluctuations at large wavenumbers is investigated.