1448 逆圧力こう配乱流境界層における速度場と温度場の関連について

概要

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Characteristics of turbulent boundary layer flows with adverse pressure gradients (APG) differ significantly from those of canonical boundary layers. We have investigated the effects of APG on the velocity and temperature fluctuations in a thermal boundary layer developing on the uniformly heated plate. It is found that, in the APG boundary layer, the turbulent Prandtl number decreases in the outer layer. This is due to that in APG flow the eddy diffusivity for momentum decreases rapidly, though the corresponding thermal diffusivity changes quite slightly. Moreover, the quadrant splitting analysis reveals that the ejection motions whose durations become larger in the APG flow contribute significantly to the heat transport, whereas the sweep motions whose durations become shorter are the main contributors to the momentum transfer.
一般社団法人日本機械学会の論文
2003-08-05