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Upstream effect on fluid thread

  1. Aug 21, 2015 #1
    I adjust my tap to produce a thread of water about 2 mm in diameter. It breaks up into droplets about 10 cm below the spout. I touch the thread near the spout with the tip of a single hair (from my head). I see ripples (standing, not travelling) on the thread 1-2 cm below the hair. The strange thing is, there are also ripples 1-2 cm ABOVE the hair.

    I Googled up
    Break-up dynamics of fluctuating liquid threads.

    Just reading the abstract tells me that this is not simple.

    Can the upstream ripples be explained on general principles without getting into these complications?

    (This was inspired by a question by 23scurtu on http://.com/questions/200815/why-does-a-continuous-water-stream-form-ripples-when-colliding-with-a-surface/200943#200943 [Broken] with videos of the effect. )
    Last edited by a moderator: May 7, 2017
  2. jcsd
  3. Aug 21, 2015 #2

    Andy Resnick

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  4. Aug 21, 2015 #3
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