1.1. Boundary Layer Theory (Contd..)

Try these first

1. 1.

   Define the term 'boundary layer'.

   Hint

   Think about the effect of viscosity near surfaces.

2. 2.

   What does the Reynolds number indicate in fluid flow?

   Hint

   Consider its formula and significance.

3. 3.

   What is the main factor determining the flow type in boundary layer theory?

   • Pressure gradient
   • Reynolds number
   • Shear stress

   Hint

   Recall how the flow behaves under different Reynolds numbers.

4. 4.

   True or False: A negative du/dy value at the wall indicates that flow has separated.

   • True
   • False

   Hint

   Think about the consequences of separation.

5. 5.

   A fluid with a viscosity of 0.001 Ns/m² flows over a flat plate of 2m length. If the velocity at the edge of the boundary layer is 0.2 m/s, calculate the boundary layer thickness at this point, and discuss how changing viscosity would affect separation.

   Hint

   Calculate Re before using thickness formula.

6. 6.

   You have two flow profiles: one with higher velocities and high adverse pressure gradients; the other with lower velocities and favorable gradients. Explain how each affects boundary layer separation.

   Hint

   Focus on pressure gradient effects on flow behavior.