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Bernoulli friction?

  1. Jul 19, 2009 #1
    Is nothing of the Bernoulli effect due to friction? Passing fluid trying to lift away a slower interface?
  2. jcsd
  3. Jul 19, 2009 #2


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    Welcome to PF!

    Hi John! Welcome to PF! :smile:
    "Friction" in fluids is viscosity (the difference being that friction involves one material leaving the other material behind, while viscosity involves one material dragging some of the other material along with it).

    The Bernoulli effect (or Bernoulli's equation or the Bernoulli principle) applies only to non-viscous flow …

    see eg http://en.wikipedia.org/wiki/Bernoulli_effect :smile:
  4. Jul 19, 2009 #3
    Thank you, tiny-tim, for doing my home work. And I struggled through the link you provided.

    OK, no friction because wrong word, and no viscous effects because not allowed. So, what sort of Bernoulli pressure sensor doesn't have viscous contamination exactly at its business end?

    Can anybody give a link to a report of measurement of bubble size variation as the bubbles pass through a venturi? A YouTube video would be even better.

    Another guy staggered by Bernoulli and lift among other aspects of the physical universe - John
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