Part 6: Pressure Variation

Question 1

Causes of Pressure Variation

Answer 1

Gravity, Acceleration, Viscous Resistance

Question 2

What is Viscous Resistance

Answer 2

• A property of all real fluid

- as a response to viscous resistance, shear stress acts in the opposite direction to a fluid motion

Question 3

The four assumptions of Bernoulli’s Equation

Answer 3

• ISIS
• the fluid is Inviscid
• the flow is along a Streamline
• the fluid is Incompressible
• the flow is Steady

Question 4

What are the two assumptions of the Euler’s Equation?

Answer 4

• consider the motion of a cylindrical fluid element along a streamline
• Consider the fluid to be inviscid (without viscosity)
• Flow is Steady
• Density is independent of Pressure

Question 5

An Ideal fluid is one that is….

Answer 5

Incompressible and inviscid

Question 6

Pressure Head

Answer 6

results from flow work, which is the amount of work required to move an element of fluid along a streamline

Question 7

Elevation Head

Answer 7

is related to the potential energy of the flow or energy of position (i.e. The energy required to lift the fluid element a height z)

Question 8

Velocity Head

Answer 8

Represents the kinetic energy associated with the motion of the fluid

Question 9

Total Head

Answer 9

Represents the amount of energy available to do work

Question 10

Irrotational

Answer 10

• face of the object stays facing same direction
• eg. Outside of a tornado
• Does not posses vorticity

Question 11

Rotational

Answer 11

• posses vorticity

- spins like a merry go round