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Air Velocity vs generated Pressure

  1. Sep 11, 2007 #1
    I have a simple question, can any one please help. It goes something like this:
    if wind is blowing at a velocity of 80 mph against a 2" X 2" plate, how much pressure (or force) is brought upon the plate?
    would appreciate the formula, if any.
    Thank you.


    Farid
     
  2. jcsd
  3. Sep 11, 2007 #2

    russ_watters

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    Staff: Mentor

    Sounds like homework. Do you have any idea how you might find the answer?
     
  4. Sep 11, 2007 #3
    Hi Russ,
    No, it is not really homework. It is my project at work. However, the surface is area is more complex than I proposed above (2"x2"). Once I know, what method to use, then I can plug in the real "area".
    I was going to find Pressure from the Bernoulie Eq. :
    dynamic pressure = q= (roh*V^2)/2 or, q=.000256*V^2 [psf]
    Once I know the pressure, then I can find the F=p/a, that my surface will be subjected to.
    Right?


    Farid
     
  5. Sep 12, 2007 #4

    russ_watters

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    You are correct. A flat plate in a uniform airstream essentially converts all velocity pressure to static pressure via Bernoulli's eq.
     
  6. Sep 12, 2007 #5
    Thank you.

    Farid
     
  7. Sep 21, 2007 #6

    stewartcs

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    Science Advisor

    NO, Force does not equal Pressure divided by Area. Force is equal to Pressure times Area.

    P = F/A which gives F = P*A

    CS
     
  8. Sep 21, 2007 #7

    russ_watters

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    D'oh. Missed that, thanks.
     
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