Abstract
Fluid motions in a turbulent combined-convection boundary layer along a vertical heated plate in air have been experimentally investigated by using a particle image velocimetory (PIV). For instantaneous velocity vectors, large-scale fluid motions moving from the maximum mean velocity location to the edge of the boundary layer intermittently appear. Such fluid motions contribute to the generation of turbulent energy, since the Reynolds stress uv takes a large positive value for the negative gradient of mean velocity.
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