13.2. Introduction to Boundary Layer Approximations

Try these first

1. 1.

   Define boundary layer.

   Hint

   Think about where flow velocity changes near a surface.

2. 2.

   What does displacement thickness represent?

   Hint

   Consider the concept of deflected streamlines.

3. 3.

   What do boundary layer equations help analyze?

   • Pressure distribution
   • Fluid flow behavior near surfaces
   • Viscosity only

   Hint

   Consider where viscous forces have significant impacts.

4. 4.

   True or False: Displacement thickness is concerned with velocity deflection in fluid layers.

   • True
   • False

   Hint

   Think of it in terms of deflected flow.

5. 5.

   Analyze the flow over a flat plate at varying speeds and calculate the displacement thickness for Reynolds numbers of 5 x 10^4 and 1 x 10^5.

   Hint

   Use your understanding of boundary layer equations.

6. 6.

   Discuss how the introduction of turbulence affects boundary layer thickness compared to laminar flow.

   Hint

   Think about the nature of turbulent flows compared to laminar ones.