3.2. Velocity Profile Layers

Try these first

1. 1.

   What is shear stress and where is it considered constant?

   Hint

   Refer to the definition of shear stress.

2. 2.

   What is the relationship between velocity and distance from the wall in turbulent flow?

   Hint

   Think about how flow behaves close to surfaces.

3. 3.

   What is the shear stress at the wall denoted as?

   • tau_max
   • tau_not
   • tau_mean

   Hint

   It's related to walls and surfaces in flow analysis.

4. 4.

   True or False: The turbulent layer is dominated by viscous effects.

   • True
   • False

   Hint

   Consider what happens in turbulent flow.

5. 5.

   Given a pipe diameter of 0.1m and a center velocity of 5 m/s, calculate the wall shear stress if the water density is 1000 kg/m³.

   Hint

   Remember, u* relates to maximum velocity and the velocity gradient near the wall.

6. 6.

   A pipeline has an average height of irregularities of 0.3mm. Given the thickness of the viscous sublayer is 0.6mm, categorize the boundary.

   Hint

   Use the ratios we discussed on boundaries to evaluate.