4.3. Turbulent flow in rough pipes

Try these first

1. 1.

   What is the definition of turbulent flow?

   Hint

   Think about how fluids behave at high speeds.

2. 2.

   Define Reynolds number.

   Hint

   It relates inertial forces to viscous forces.

3. 3.

   What happens to the velocity of fluid near the wall of a rough pipe?

   • It remains constant
   • It decreases to zero
   • It increases

   Hint

   Consider what it means for a fluid to 'stick' to a surface.

4. 4.

   True or False: The roughness of a pipe has no effect on turbulent flow.

   • True
   • False

   Hint

   Think about how smooth and rough surfaces interact with fluids.

5. 5.

   Given a rough pipe with a diameter of 15 cm, determine the average roughness if the velocity at 5 cm height from the wall is 50% more than at 2 cm.

   Hint

   Refer to the logarithmic relationships discussed.

6. 6.

   You have two pipes: one smooth and one rough. How would you experimentally determine if the flow is turbulent in each?

   Hint

   Visualizing the velocity distribution will provide insights.