# Air Velocity vs generated Pressure

1. Sep 11, 2007

### Farid

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. Sep 11, 2007

### Staff: Mentor

Sounds like homework. Do you have any idea how you might find the answer?

3. Sep 11, 2007

### Farid

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

4. Sep 12, 2007

### Staff: Mentor

You are correct. A flat plate in a uniform airstream essentially converts all velocity pressure to static pressure via Bernoulli's eq.

5. Sep 12, 2007

### Farid

Thank you.

Farid

6. Sep 21, 2007

### stewartcs

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

7. Sep 21, 2007

### Staff: Mentor

D'oh. Missed that, thanks.