22.2. Today's Contents

Try these first

1. 1.

   What is hydraulic diameter?

   Hint

   Think about how we characterize non-circular conduits.

2. 2.

   What does wall shear stress represent?

   Hint

   Consider the interaction between the fluid and the surface.

3. 3.

   What is the hydrolic diameter formula?

   • D_h = A/P
   • D_h = 4(A/P)
   • D_h = P/4A

   Hint

   Recall how we calculate equivalent diameters.

4. 4.

   Wall shear stress varies in laminar flow.

   • True
   • False

   Hint

   Think about how flow conditions affect stress distribution.

5. 5.

   You are tasked to design a non-circular conduit for a city water supply. How would you approach the determination of hydraulic diameter and wall shear stress?

   Hint

   Consider if the pipe will operate in laminar or turbulent conditions.

6. 6.

   A flow in a triangular pipe exhibits a non-uniform velocity profile. Explain how you would determine the wall shear stress for this scenario.

   Hint

   Relate back to the discussion on laminar vs turbulent flow.