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Combined dye-streak and hydrogen-bubble visual observations of a turbulent boundary layer

Published online by Cambridge University Press:  29 March 2006

G. R. Offen  and
S. J. Kline
G. R. Offen
Affiliation:
Department of Mechanical Engineering, Stanford University, California
S. J. Kline
Affiliation:
Department of Mechanical Engineering, Stanford University, California
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Abstract

The turbulent boundary layer over a flat plate was observed visually using two dye injectors and a normal bubble wire. One dye injector was a standard wall slot; the other one was a small Pitot probe which could be placed anywhere in the flow. The purpose of these experiments was to improve understanding of the relationships between the bursting of low-speed streaks near the wall and the flow field farther away from the wall.

On the basis of these observations, it seems that (i) each lift-up is associated with a disturbance which originates in the logarithmic region and is characterized by a mean motion towards the wall, and that (ii) such disturbances are generated by the interaction of an earlier burst from further upstream with the fluid motion in the logarithmic region.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 62 , Issue 2 , 23 January 1974 , pp. 223 - 239
Copyright
© 1974 Cambridge University Press

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References

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