Practice Displacement Thickness (13.6) - Boundary Layer Approximation III

Practice: Displacement Thickness

Lesson 13.6Boundary Layer Approximation III

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9 questions

Flashcard drill
2 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
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Quiz
3 questions · about 2 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
Define displacement thickness.
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Think about how flow behaves near a surface.
Question 2.
What does the term boundary layer refer to?
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Consider what happens to flow as it moves close to a wall.
3Question 3.
What is the primary effect of displacement thickness?
- A shift in streamlines
- An increase in pressure
- A decrease in fluid density
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Consider how the fluid's path changes near solid surfaces.
4Question 4.
True or False: Displacement thickness is always greater than momentum thickness.
- True
- False
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Think about the definitions of each type of thickness.
Question 5.
For a laminar flow over a flat plate with the upper velocity of 10 m/s, calculate the displacement thickness at a position where the Reynolds number is 50,000, assuming constant viscosity.
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You might need to use the relationships provided in the lecture.
Question 6.
How does an increase in flow velocity impact the displacement thickness and what implications does this have on drag for an aerodynamic surface?
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Consider the relationship between Reynolds number and boundary layer characteristics.

5 more questions in this section. Enroll free to practise them all.