4.2. Velocity Deficit

Try these first

1. 1.

   Define the transition zone.

   Hint

   Think of the area marking a change in flow behavior.

2. 2.

   What is the velocity deficit?

   Hint

   Consider what happens when fluid flows past a surface.

3. 3.

   What happens in the transition zone?

   • Flow becomes laminar
   • Flow becomes turbulent
   • Flow remains steady

   Hint

   Recall the types of flow and when they change.

4. 4.

   True or False: The laminar sub-layer is independent of viscosity.

   • True
   • False

   Hint

   Think about what dominates at small scales.

5. 5.

   A fluid flows over a flat plate. Calculate the velocity deficit at a point where the local velocity is 0.3 U and U is the free stream velocity.

   Hint

   Consider how local velocities compare to free stream.

6. 6.

   Discuss how an increase in plate length would affect the boundary layer development and velocity deficit.

   Hint

   Think of how distance changes interactions in flowing fluids.