22. Fluid Mechanics

Try these first

1. 1.

   What is the hydraulic diameter and how is it calculated?

   Hint

   Remember the formula: Hydraulic Diameter = 4A/P

2. 2.

   What does the Moody chart represent?

   Hint

   Think about how it helps with flow prediction.

3. 3.

   What is the primary purpose of Nikuradse's experiments?

   • To measure wall shear stress
   • To examine laminar flow
   • To design circular pipes

   Hint

   What was his main focus in experimental design?

4. 4.

   True or False: Turbulent flow is characterized by smooth, orderly flow.

   • True
   • False

   Hint

   Recall the definitions of laminar and turbulent flow.

5. 5.

   Given a turbulent flow with a Reynolds number of 3.5 million in a square duct with a side length of 0.5 m, calculate the hydraulic diameter and discuss the expected wall shear stress impact.

   Hint

   Calculate the areas and wetted perimeter for a square cross-section.

6. 6.

   Analyze the energy losses in a circular pipe versus a rectangular duct with the same flow area. Discuss how the shape affects friction losses.

   Hint

   Consider the formulas for hydraulic diameter and friction loss components.