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

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  • #1
daniscp
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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?
 

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  • #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?
 
  • #3
Mech_Engineer
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I recognize your name now... Isn't this basically a repost of your previous thread?
 
  • #4
daniscp
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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?

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:
 
  • #5
brewnog
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How about some strain gauges?
 
  • #6
jaap de vries
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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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