鉛直平板上自由対流境界層の遷移域近傍の特性

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  • Characteristic of Free-Convection Boundary Layer in Transition Region along Vertical Plate.
  • エンチョク ヘイバンジョウ ジユウ タイリュウ キョウカイソウ ノ センイイキ

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The temperature and the streamwise and normal velocities in the free-convection boundary layer along the vertical plate with uniform heat generation in air were measured along with the surface temperature on the plate. The downstream growth of the temperature and velocity disturbances from the end of the laminar to the beginning of the fully turbulent region were investigated, considering the initial disturbance level. When the initial disturbance level was relatively low, the intensity profiles of the velosities in the transition region had two peaks, which were previously found by Gebhart et al. in the streamwise velocity intensity profiles using water. However, when the downstream growth of the disturbances was compared using X*(=Gγ*1/4x) as a streamwise dimensionless distance, the present growth rates of the temperature and velocity disturbances were found to be 5∼6 times larger than those for the previous case of water.

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