2.2. Velocity Profile for Turbulent Boundary Layer

Try these first

1. 1.

   What is the one-seventh power law?

   Hint

   Think about how velocity changes with respect to distance in a boundary layer.

2. 2.

   Define drag force.

   Hint

   It’s related to how the fluid interacts with the surface.

3. 3.

   What does the one-seventh power law describe?

   • Turbulent velocity profiles
   • Laminar flow
   • Pressure gradients

   Hint

   Think about which profile is being discussed.

4. 4.

   True or False: Higher Reynolds numbers lead to thicker boundary layers.

   • True
   • False

   Hint

   Reflect on the relation between flow speed and thickness.

5. 5.

   Given a plate with a turbulent boundary layer, calculate the drag force when U = 10 m/s, δ = 0.1 m, and L = 2 m.

   Hint

   First, calculate Reynolds number for proper τ₀.

6. 6.

   Describe a real-world example where controlling boundary layer separation is crucial.

   Hint

   Consider the effects of airflow in aviation.