1. PO 2430 Applied Fluid MEchanics
QUIZ #3 Review

2. Quiz #3 Review Increases A Decreases B Remains the same C
When velocity goes up, the Reynolds number….
Increases
Decreases
Remains the same A B
The answer is: A
Have TCs read and write their choice of best answer and vote using the red, yellow, green cards. They then turn to their partners and or tell their partner. C

3. Quiz #3 Review Increases A Decreases B Remains the same C
When the density of the fluid goes up, the Reynolds number….
Increases
Decreases
Remains the same A B
The answer is: A
Have TCs read and write their choice of best answer and vote using the red, yellow, green cards. They then turn to their partners and or tell their partner. C

4. Quiz #3 Review Increases A Decreases B Remains the same C
When dynamic viscosity goes up, the Reynolds number….
Increases
Decreases
Remains the same A B
The answer is: A
Have TCs read and write their choice of best answer and vote using the red, yellow, green cards. They then turn to their partners and or tell their partner. C

5. Quiz #3 Review Increases A Decreases B Remains the same C
When the diameter of the pipe goes up, the Reynolds number….
Increases
Decreases
Remains the same A B
The answer is: A
Have TCs read and write their choice of best answer and vote using the red, yellow, green cards. They then turn to their partners and or tell their partner. C

6. Quiz #3 Review
In the diagram shown, which number shows ideal flow? 1 2 3 A B
The answer is: A
Have TCs read and write their choice of best answer and vote using the red, yellow, green cards. They then turn to their partners and or tell their partner. C

7. Quiz #3 Review Turbulent flow A Laminar flow B
Darcy’s Equation can be used for
Turbulent flow
Laminar flow
Laminar and turbulent flow A B
The answer is: A
Have TCs read and write their choice of best answer and vote using the red, yellow, green cards. They then turn to their partners and or tell their partner. C

8. Quiz #3 Review Relative roughness A Friction factor B
The following is not an example of a dimensionless number
Relative roughness
Friction factor
Dynamic viscosity divided by density A B
The answer is: A
Have TCs read and write their choice of best answer and vote using the red, yellow, green cards. They then turn to their partners and or tell their partner. C

9. Quiz #3 Review Turbulent flow A Laminar flow B Transitional flow C
Viscous forces are more important in the case of
Turbulent flow
Laminar flow
Transitional flow A B
The answer is: A
Have TCs read and write their choice of best answer and vote using the red, yellow, green cards. They then turn to their partners and or tell their partner. C

10. Recommended Problems
Reynolds numbers Energy losses

11. Quiz #3 Review The wetted perimeter divide by the flow area A
Hydraulic radius is defined as
The wetted perimeter divide by the flow area
The flow area divided by the wetter perimeter
The flow area times the wetter perimeter A B
The answer is: A
Have TCs read and write their choice of best answer and vote using the red, yellow, green cards. They then turn to their partners and or tell their partner. C

12. Quiz #3 Review Four times the hydraulic radius A
In order to calculate Reynolds Number or use Darcy’s Equation, the diameter term is replaced by
Four times the hydraulic radius
Two times the hydraulic radius
The hydraulic radius A B
The answer is: A
Have TCs read and write their choice of best answer and vote using the red, yellow, green cards. They then turn to their partners and or tell their partner. C

13. Quiz #3 – Hydraulic Radius
Determine the pressure drop for a 50-m length of a horizontal duct with the cross-sectional area shown below. Ethylene glycol at 25ºC is flowing at a rate of 0.16 m3/s. The inside dimension of the square is 250 mm and the outside dimension of the tube is 150 mm. Use 𝜀=3 × 10 −5 m. We calculated the following last class: A = m2 V = 3.57 m/s R = m (hydraulic radius) NR = 2.96x104