11.2. Boundary Layer Theory

Try these first

1. 1.

   What is a boundary layer?

   Hint

   Think about where fluid and surface interaction occurs.

2. 2.

   How do you define shear stress?

   Hint

   Consider the forces acting parallel to a surface.

3. 3.

   What is the primary factor that characterizes fluid behavior near surfaces?

   • Viscosity
   • Density
   • Temperature

   Hint

   Consider what affects the friction between layers.

4. 4.

   The flow is considered laminar when the Reynolds number is:

   • Less than 100,000
   • Greater than 100,000

   Hint

   Reflect on the definitions of flow types.

5. 5.

   Analyze a vehicle's drag based on its shape and Reynolds number. Briefly explain how this impacts fuel efficiency.

   Hint

   Consider common vehicle shapes and their drag characteristics.

6. 6.

   Given a Reynolds number of 1,200, determine if the flow near a flat plate would be laminar or turbulent. Justify your answer.

   Hint

   Refer back to the critical Reynolds numbers for classification.