Applications of Bernoulli’s Principle

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Applications of Bernoullis Principle
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P ?gy ½ ?v2 constant
If no change in height P ½?v2 constant
slower speed
faster speed
more pressure
less pressure
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As the speed of a fluid increases, the pressure
in the fluid decreases.
P a 1/v
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energy
kinetic
Motion of fluid
Pressure in fluid
energy
potential
KE PE is constant
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v
d/4
d
If incompressible fluid (density ?), change in
pressure?
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Bernoulli Flight

• Bernoullis Principle is what allows birds and
  planes to fly.
• The secret behind flight is under the wings.

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AIRFOIL
On top greater air speed and less air pressure
On bottom less air speed and more air pressure
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LIFT
THRUST
DRAG
GRAVITY
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v2
v1
Net force on wing?
½ A?(v22 v12)
?air 1.29 kg/m3
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Spoiler airfoil reversed
less air speed more pressure
greater air speed less pressure
net force downward
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Racecar
Spoiler provides better traction and avoids lift
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Wind over a roof
Patm Proof ½ ?v2
v
proof
v 0 patm
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slow air speed
fast air speed
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Curve Ball
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Golf ball dimples
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Winds over a mountain
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Shower Curtain
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Atomizer As air passes at top of tube, the
pressure decreases and fluid is drawn up the tube.