Laminar and Turbulent Flow: More Practice

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Presentation transcript:

Laminar and Turbulent Flow: More Practice

Bernoulli’s Principle: Student Success Criteria I can state Bernoulli's principle, explain some of its applications, and conduct an investigation to demonstrate it.

Bernoulli’s Principle SPH4C

Fluid Flow The speed at which a fluid flows depends on the diameter of the pipe. In the diagram below, the fluid must flow more quickly in section B than in section A.

Pressure Differences The water must accelerate as it moves from A to B. This acceleration must be caused by a force. This force is caused by the difference in pressure between the two regions.

Bernoulli’s Principle Where the speed of a fluid is low, the pressure is high. Where the speed of a fluid is high, the pressure is low.

Lift The upward force, or lift, on an airplane wing can be explained using Newton’s 3rd Law of Motion and Bernoulli’s Principle.

Lift and Newton As the wing moves forward, air deflects off the bottom of the wing: the wing pushes on the air. The air therefore pushes back (the reaction force).

Lift and Bernoulli The speed of the air near the deflection is less than the speed of the flow of air over the wing. Therefore the pressure under the wing is higher than the pressure over the wing.

More Practice Bernoulli’s Principle Lab Activity