Abonnement à la biblothèque: Guest
Third Symposium on Turbulence and Shear Flow Phenomena
June, 25-27, 2003, International Center, Sendai, Japan

DOI: 10.1615/TSFP3

TURBULENT STATISTICS OF RAREFIED FLOWS IN A MICROCHANNEL

pages 763-768
DOI: 10.1615/TSFP3.1290
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RÉSUMÉ

Direct Numerical Simulation (DNS) has been carried out to investigate the effect of weak rarefaction on turbulent flow characteristics in microchannels. Knudsen numbers of the simulated flow are selected to be O.O(un-rarefied), 0.001, 0.005, 0.01 and 0.02 respectively. Validity of the calculation is demonstrated by the combination of presenting the data of two-point correlation functions and one-dimensional power spectra and comparing the results with available reported results. Turbulent statistics including mean streamwise velocity, turbulent intensities and Reynolds shear stress are investigated under the rarefied conditions. It can be concluded that the weakly rarefied turbulent flow has higher streamwise velocity over the whole channel width. Rarefaction can also lead to higher turbulent intensities and higher Reynolds shear stress in the vicinity ofthe wall.

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