Practice Summary Of The Problems (6.3) - Boundary Layer Theory (Contd.,)

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6 sample questions

Question 1.
Define displacement thickness.
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Think about how viscosity affects flow near surfaces.
Question 2.
What does momentum thickness measure?
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Relate it to uniform flow and viscosity.
3Question 3.
What is displacement thickness?
- The thickness of fluid in the boundary layer
- The distance a streamline is displaced
- The volume of fluid lost
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Consider what happens to a streamline due to viscous effects.
4Question 4.
True or False: Momentum Thickness is the same as Displacement Thickness.
- True
- False
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Recall the definitions of both concepts.
Question 5.
For a flat plate, given the velocity profile u/U = y^3/delta^3, derive the displacement thickness, momentum thickness, and energy thickness.
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Use integrals for each to find thickness values using given velocity profiles.
Question 6.
Discuss the effects of a turbulent boundary layer on the three thicknesses compared to a laminar boundary layer.
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Contrast between flow nature in laminar versus turbulent conditions.

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