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Effect of micobubbles on the structure of turbulence in a turbulent boundary layer

机译:微气泡对湍流边界层湍流结构的影响

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摘要

The time-averaged velocity and turbulence inten- sity distributions were measured by a laser Doppler veloci- meter in a turbulent boundary layer filled with microbubbles. The void fraction distribution was also measured using a fiber- Optic probe. The velocity decreased in the region below 100 Wall units with an increase in bubble density. This led to a Decrease in the velocity gradient at the wall, which was Consistent with a decrease in shearing stress on the wall.
机译:时均速度和湍流强度分布是通过激光多普勒测速仪在充满微气泡的湍流边界层中测量的。还使用光纤探针测量空隙分数分布。随着气泡密度的增加,速度在100个Wall单位以下的区域降低。这导致壁上的速度梯度减小,这与壁上的剪应力减小一致。

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