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Experimental work to prove that the Drag Coefficient of a sphere is 0.5

  1. Apr 25, 2008 #1
    Is there any experiments I could do to prove that the Drag Coefficient of a Sphere is more or less 0.5 depending on the roughness of the sphere?
     
  2. jcsd
  3. Apr 25, 2008 #2

    Mech_Engineer

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    The obvious question- do you have access to a wind tunnel?

    Other than that, it might be possible to levitate the sphere in a vertical tube with air blowing through at its terminal velocity, or perhaps drop the sphere a long distance and measure its fall time very precisely, and compare that time to a calculated fall times with and without drag?
     
  4. Apr 25, 2008 #3

    Mech_Engineer

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    I recognize your name now... Isn't this basically a repost of your previous thread?
     
  5. Apr 25, 2008 #4
    Yeah I have access to a wind tunnel...

    It's not a repost since I've decided now to focus on proving that the drag coefficient of a sphere is 0.5. The only thing I need to think of is an experiment to measure the drag force...but can't come up with one :mad:
     
  6. Apr 25, 2008 #5

    brewnog

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    How about some strain gauges?
     
  7. Apr 26, 2008 #6
    You can measure the flow velocity behind the ball using a pitot at several locations that you can calculate the momentum change which is equal to the drag force so you divide that by D*rho*V^2*0.5 and you will probably get a value near 0.5 (plus or minus 0.5).
     
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