Visualization of Generation Process of a Turbulent Spot
At a later stage of transition in a flat plate boundary layer, the relation between spikes in wave forms of velocity fluctuations and hair-pin eddies in flow visualization was investigated in a water flow by applying hot wire and hydrogen bubble techniques simultaneously. It was shown that spikes in wave forms are caused by hair-pin eddies which were formed through the secondary instability in a high shear layer.
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