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Applications of Bernoullis Principle
faster speed slower speed more pressureless pressure If no change in height: P + ½ρv 2 = constant P+ ρgy + ½ ρv 2 = constant
As the speed of a fluid increases, the pressure in the fluid decreases. P α 1/v
Motion of fluid energykinetic Pressure in fluidenergy potential KE + PE is constant
d d/4 v If incompressible fluid (density = ρ), change in pressure?
Bernoulli & Flight BernoullisBernoullis Principle is what allows birds and planes to fly. TheThe secret behind flight is under the wings.
AIRFOIL On top: greater air speed and less air pressure On bottom: less air speed and more air pressure
DRAG THRUST LIFT GRAVITY
v1v1 v2v2 Net force on wing? ½ Aρ(v 2 2 – v 1 2 ) ρ air = 1.29 kg/m 3
Spoiler – airfoil reversed greater air speed less pressure less air speed more pressure net force: downward
Racecar Spoiler provides better traction and avoids lift
Wind over a roof v v = 0 p atm p roof P atm = P roof + ½ ρv 2
slow air speed fast air speed
Golf ball dimples
Winds over a mountain
Atomizer – As air passes at top of tube, the pressure decreases and fluid is drawn up the tube.
Chapter 13 Fluid Pressure. Chapter 13 Water pressure increases as depth increases. The pressure is constant, and it is exerted equally in all directions.
There are all different types of planes like army planes, jets, planes that take people to different places, remote control planes and much more.
Forces act in pairs. Force engine = thrust friction = drag.
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In order to calculate pressure exerted on a surface, what quantity is divided by the surface area force.
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