4.2. Lamination to Turbulence Transition

Try these first

1. 1.

   What is the no-slip condition?

   Hint

   Consider what happens to fluid particles at the surface.

2. 2.

   What are the two regions identified in boundary layer theory?

   Hint

   Think about areas of flow affected by viscosity.

3. 3.

   What is the boundary layer thickness?

   Hint

   Think about where the velocity starts changing.

4. 4.

   The no-slip condition means that fluid velocity is ___ at the boundary.

   • Equal to free-stream velocity
   • Zero
   • Maximum

   Hint

   Consider what happens right at the surface.

5. 5.

   A fluid with a kinematic viscosity of 0.001 m²/s flows over a flat plate at a free stream velocity of 1 m/s. Determine the Reynolds number when the distance from the leading edge is 0.2 m. What can you infer about the flow state?

   Hint

   Apply the formula Re = Ux/ν.

6. 6.

   Discuss how the principles of the boundary layer theory can be applied in environmental contexts, such as pollutant dispersal in rivers.

   Hint

   Think about the impact of flow regime on mixing efficiency.