22.2.2. Wall Shear Stress Computation

Try these first

1. 1.

   What is Wall Shear Stress?

   Hint

   Think about the force exerted by fluid against pipe walls.

2. 2.

   Define Hydraulic Diameter.

   Hint

   Consider the two key components: area and wetted perimeter.

3. 3.

   What is the function of wall shear stress?

   • To cause turbulence in a fluid
   • To exert force on walls of a conduit
   • To predict flow rate

   Hint

   Think about the interaction between fluid and surfaces.

4. 4.

   The Moody chart is used to find what?

   • Density of fluids
   • Friction factors based on Reynolds number
   • Velocity of water flow

   Hint

   Consider its application to flow regimes.

5. 5.

   A rectangular channel with a width of 4m and depth of 3m is in use. Calculate the hydraulic diameter and the expected wall shear stress if the flow exhibits turbulent characteristics with a Reynolds number of 15,000.

   Hint

   Ensure to consider how turbulent flow affects shear stress predictions.

6. 6.

   A pipe with a diameter of 0.1m has a flow rate of 0.01m³/s. Calculate the wall shear stress if the viscosity of the fluid is 1cP and the Reynolds number indicates turbulent flow.

   Hint

   Pay attention to the flow regime to select the correct friction factor.