MET308 Practice for Quiz 3

MET308 Practice for Quiz 3

Fill in the Blanks

To determine the flow regime, we first calculate the

number.

Turbulent vs Laminar

The classification of the flow as turbulent or laminar depends on the Reynolds number.

Multiple Choice

You can use an easy formula like f=64/Re to find the friction factor if the flow is what type?

• Laminar

• Turbulent

Multiple Select

Which of the following do we use to find the friction factor if the flow is turbulent? Check all that apply.

• 64/Re

• Colebrook equation or simplified approximation

• Read it off a chart

• Assume it's 1

Darcy friction factor f

• We need this to determine the pump's power requirements to keep the flow going

• Recall that we need the pressure drop to find out how much power the pump needs

Multiple Choice

Power is work divided by what?

• Area

• Time

• Force

• Efficiency

Power

We determine the power a pump needs based on the pressure losses.

Multiple Choice

What is the critical Reynolds number?

• $2\cdot10^5$

• $5\cdot10^5$

• $3\cdot10^6$

• It depends

Fill in the Blanks

The drag coefficient $C_D$   accounts for form or pressure drag and

drag.

Open Ended

How does having flaps on an airplane change its aerodynamics?