自然対流乱流境界層の時空間構造

概要

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The space-time structure of a turbulent natural convection boundary layer along a vertical flat plate in air has been examined using a thermocouple rake and a pair of hot-wire/cold-wire arrangements. The instantaneous temperature profile clearly indicates the evolution of a large-scale fluid motion originating in the outer region of the boundary layer. However, the space-time correlation measurements have not suggested any existence of quasi-coherent structures such as low-speed streaks and bursts. The convection velocity and characteristic length scales of turbulence have also been investigated. The convection velocity exceeds the local mean velocity in the near wall and outermost regions. The microscale of the thermal field shows a strongly anisotropic structure, and the integral scale indicates a large-scale structure normal to the wall.
一般社団法人日本機械学会の論文
1990-07-25