12.3.1. Assumptions Behind Boundary Layer Equations

Try these first

1. 1.

   What is a boundary layer?

   Hint

   Think about the surface interaction with the liquid.

2. 2.

   What Reynolds number indicates laminar flow?

   Hint

   Consider the threshold values discussed.

3. 3.

   What happens to boundary layer thickness as Reynolds numbers increase?

   • Increases
   • Decreases
   • Stays the same

   Hint

   Focus on the relationship between flow nature and boundary layer characteristics.

4. 4.

   True or False: The pressure gradient in the y-direction is significant across the boundary layer.

   • True
   • False

   Hint

   Think back to how pressure gradients were analyzed.

5. 5.

   Given a flat plate with a flow of Reynolds number 500, calculate the boundary layer thickness. What changes occur as the Reynolds number increases to 1000?

   Hint

   Refer to how the boundary layer relates to Reynolds number.

6. 6.

   How would the estimation of wall shear stress change between laminar and turbulent boundary layer scenarios for a given flat plate configuration?

   Hint

   Consider how the transition affects flow behaviors.