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Homework Statement
I am working on making a small wind tunnel using a 20" fan. What i want to figure out is the force generated by the movement of air. I want to make the size of the tunnel shrink to help induce more velocity in the air (see picture).
Homework Equations
Bernoulli's Equation-
p1*v1=p2*v2
p being the air pressure in the tube
v being the air velocity in the tube
air friction equation (from http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html" )-
F=(-1/2)*C*p*A*v^2
F= force
C=numerical drag coefficient
p=density
A=area
v=velocity
Newtons second law(duh..)-
F=ma
F=force
m=mass
a-acceleration
The Attempt at a Solution
The equation that will help the most with this is the second equation- F=(-1/2)*C*p*A*v^2
F= force
C=numerical drag coefficient
p=density
A=area
v=velocity
First off, HyperPhysics doesn't tell me any of the units for F, C, p, A and v. Second, what is the numerical drag coefficient? Since this is a fan moving air at a distance, I'm going to suspect that there will be some inverse square law to add to this equation. Not to mention that because the shape of the tube narrows down, it will likely alter the equation.
Thanks for helping out
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