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International Heat Transfer Conference 11

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

DIRECT NUMERICAL SIMULATION OF A TURBULENT CHANNEL FLOW WITH A LINEAR SPANWISE NON-UNIFORMITY OF TIME-MEAN TEMPERATURE (EXAMINATION ON THE TURBULENCE STATISTICS)

Koji Matsubara
Graduate School of Science and Technology, Niigata University Ikarashi 2-nocho 8050, Niigata 950-21, Japan

Mutsuo Kobayashi
Faculty of Engineering, Niigata University Ikarashi 2-nocho 8050, Niigata 950-21, Japan

Hiroshi Maekawa
Department of Mechanical Engineering and Intelligent Systems, the University of Electro-Communications 182-8585 Tokyo; Graduate School of Engineering, Hiroshima University 1-4-1 Kagamiyama, Higashi-Hiroshima-shi, 739-8527 Hiroshima, Japan

Kenjiro Suzuki
Department of Mechanical Engineering, Kyoto University, Kyoto; Department of Machinery and Control Systems, Shibaura Institute of Technology, 307 Fukasaku, Saitama, 337-8570, Japan

DOI: 10.1615/IHTC11.3910
pages 337-342

Abstrakt

Direct numerical simulation(DNS) was performed for a turbulent channel flow with time-mean temperature linearly varying in the spanwise direction. With this simple flow case, spanwise transfer of heat in wall turbulence was explored. The computed flow field was confirmed to be in good agreement with the existing DNS result for a channel flow obtained by Kasagi et al.(1992a). General trend of the presently calculated spanwise eddy diffusivity of heal shows similarity to the experimental data reported by Maekawa et al.(1991). However, there is remarkable discrepancy between both results in the vicinity of the wall. The numerical result demonstrates that the spanwise turbulent heat flux is nearly in the local equilibrium over the whole channel width excluding the viscous sublayer.

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