2.1 INTRO TO FLUID FLOW Flashcards

1
Q

What is Newton’s first law of motion?

A

Unless a force acts on a body, its velocity will not change.

If F=0, then change in u=0

Provides intuitive meaning of force: that agent which CHANGES the velocity of a body

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2
Q

What is Newton’s second law of motion?

A

The rate of change of momentum (mu) of a body, is proportional to the force that acts on it.

F = m.a

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3
Q

What is Newton’s third law of motion?

A

For any force exerted, there is an equal force in the opposite direction.

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4
Q

What is viscosity?

A

A measure of the resistance of a fluid to deformation e.g. shearing or extension.
(Simply, the resistance of a fluid to flow)

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5
Q

How do you obtain the kinematic viscosity v (nu)?

A

Divide the dynamic viscosity by density.

L^2T^-1 (L^2/T)

It is the ratio of dynamic viscosity to fluid density.

SI base units: kg m^-1 s^-1

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6
Q

What is the Bernoulli effect?

A
  • Fluid velocity varies inversely with fluid pressure
  • Demonstration with balloons; U2 > U1, P2>P1
  • The sum of a pressure term, a velocity term and a gravitational/height term remain constant
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