Hydraulics: Reynolds and Flow - Concept and Example

Situation 3: Oil with a sp.gr of 0.85 has a kinematic viscosity of 1.243 x 10-6 m2/s.
7. How many stokes is equivalent to 1.243 x 10-6 m2/s?
a. 0.001243 c. 0.1243
b. 0.01243 d. 1.243
8. What is the value of viscosity in Pa-s?
a. 0.000994 c. 0.001057
b. 0.001068 d. 0.001243
9. What is the absolute viscosity in Poise?
a. 0.00994 c. 0.01057
b. 0.01068 d. 0.01243
Situation 4: A fluid flow at 0.001 m3/s through a 100 mm diameter pipe.
10. Determine the velocity
a. 0.042 m/s c. 0.095 m/s
b. 0.064 m/s d. 0.127 m/s
11. Determine the Reynolds Number and Flow of Air: υ=1.51 10^(-5) m2/s
a. 843, Turbulent c. 31361, Turbulent
b. 843, Laminar d. 31361, Laminar
12. Determine the Reynolds Number and Flow of Gasoline: υ=4.06 10^(-7) m2/s
a. 843, Turbulent c. 31361, Turbulent
b. 843, Laminar d. 31361, Laminar
Situation 5: A pipe has a diameter of 20 mm and a length of 80 m. A liquid having a kinematic viscosity of 4 x 10-5 m2/s is flowing thru the pipe at a velocity of 3m/s. ε=0.0018
13. Compute the Reynolds Number
a. 1,500, Turbulent c. 3,000, Turbulent
b. 1,500, Laminar d. 3,000, Laminar
14. Compute the friction factor
a. 0.0427 c. 0.0213
b. 0.0671 d. 0.0667
15. Compute the head loss of the pipe
a. 39.08 m c. 78.29 m
b. 122.39 m d. 123.12 m

Situation 6: Oil with υ= 0.000025 m2/s flows through a 50-cm ϕ pipe 100 m long at 4 m/s. ε=0.00194
16. What is the Reynolds number?
a. 65,000 , Turbulent c. 80,000 , Turbulent
b. 65,000 , Laminar d. 80,000 , Laminar
17. What is the friction factor?
a. 0.0592 c. 0.00952
b. 0.0952 d. 0.0295
18. What is the total head loss?
a. 3.88 m c. 24.14 m
b. 12.04 m d. 38.82 m