Let us take a rubber (or plastic) pipe that discharges water into the atmosphere.
If we squeeze the pipe wall on two opposite sides a couple of diameters ahead of its free end, but without closing it (i.e. by letting the flow free to go), an instability phenomenon will occur.
At the squeezed site, the water pressure goes under the atmospheric one (because afterwards the cross section increases), so the pipe tends to close up and no flow occurs. But then, the pressure before the squeezed site builts up (because no flow is occurring) and the flow starts up again. This behaviour turns out to be recurring.
Therefore, the flow at the pipe exit keeps pulsating in an unsteady fashion.
I wonder if anyone studied this phenomenon.
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