13.5.2. Reynolds Number

Try these first

1. 1.

   What is Reynolds number used for?

   Hint

   Think about what affects flow.

2. 2.

   What does a Reynolds number less than 2000 indicate?

   Hint

   Consider flow characteristics.

3. 3.

   What is the critical Reynolds number that typically separates laminar from turbulent flow?

   • 1000
   • 2000
   • 4000

   Hint

   Think about the transition threshold.

4. 4.

   True or False: A higher Reynolds number indicates a more likely turbulent flow.

   • True
   • False

   Hint

   Consider flow characteristics.

5. 5.

   A cylindrical pipe has a diameter of 0.1 m, and water flows through it at a velocity of 3 m/s. If the dynamic viscosity is known to be 0.001 Pa·s, calculate the Reynolds number. Discuss if the flow is laminar or turbulent.

   Hint

   Use the formula and break down your calculations.

6. 6.

   Compare two scenarios: a thin oil flowing at low speed compared to water flowing rapidly through a pipe. Discuss how Reynolds number aids in predicting behavior in each case.

   Hint

   Reflect on how viscosity and velocity interact.