Dustinsfl
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Watch Amazing Water Flow Visualizations - From brusspup!
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Jameson
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Interesting video! I don't quite get the set up though. Is the speaker only to the side or is it below as well? I don't see how they get the reverse flow effect. 
Opalg
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MHB
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Presumably the camera takes images at the rate of 24Hz. The speaker somehow induces the water to form drops at the same rate, so that the flow appears to become stationary. If the rate is reduced to 23Hz then the flow appears to go into reverse.Jameson said:Interesting video! I don't quite get the set up though. Is the speaker only to the side or is it below as well? I don't see how they get the reverse flow effect.