A Spatially Advancing Turbulent Flow and Heat Transfer in a Curved Channel(Thermal Engineering)

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  • 空間的に発展する曲がりチャネル内乱流熱伝達(熱工学,内燃機関,動力など)
  • 空間的に発展する曲がりチャネル内乱流熱伝達
  • クウカンテキ ニ ハッテン スル マガリ チャネル ナイランリュウ ネツ デンタツ

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Direct numerical simulation was performed for a spatially advancing turbulent flow and heat transfer in a two-dimensional curved channel, where one wall was heated at the constant temperature and another wall was cooled similarly. In the simulation, fully developed flow and temperature computed by the straight-channel driver was given to the inlet of curved channel domain. The frictional Reynolds number was assigned 150, and the Prandtl number was given 0.71. Since the flow field was examined in the previous paper, thermal features are mainly targeted in the present paper. Turbulent heat flux showed trends consistent with growing process of large-scale vortices. In the curved part, the wall-normal component of the turbulent heat flux was twice as large as the counterpart in the straight part, suggesting active heat transport of large-scale vortices. In the inner side of the same part, temperature fluctuation was abnormally large when compared with modest fluctuation of wall-normal velocity. This was caused by the combined effect of the large-scale motion of the vortices and the monotonous variation of the mean temperature; in such a temperature distribution, large-scale ejection of the hot fluid near the outer, which is transported into the near inner-wall region, should made large impact on thermal boundary layer near the inner wall. Wave number decomposition was made for various statistics, and such effort showed that contribution of the large-scale vortex to the total turbulent heat flux normal to the wall was roughly 80 percent at the channel center of 130° downstream from the curved-channel inlet.

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