Practice Boundary Conditions And Solutions (13.5) - Boundary Layer Approximation III

Practice: Boundary Conditions and Solutions

Lesson 13.5Boundary Layer Approximation III

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9 questions

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3 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.
What is the definition of a boundary layer?
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Think about where water flows over a surface.
Question 2.
What condition does the no-slip boundary imply at the surface?
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Remember that the fluid cannot 'slip' across the surface.
3Question 3.
What does the term 'displacement thickness' refer to?
- A measure of the flow speed
- A shift in streamline position
- Layer depth in the fluid
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Think about how streamlines are affected when a boundary layer is present.
4Question 4.
True or False: Laminar flows are characterized by chaotic motions.
- True
- False
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Recall the definitions of laminar and turbulent flows.
Question 5.
A fluid flows past a flat plate with a length of 5m. If the free stream velocity is 10 m/s and the kinematic viscosity of the fluid is 0.001 m2/s, calculate the boundary layer thickness at the end of the plate.
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Remember to compute Reynolds number first!
Question 6.
Describe how the transition from laminar to turbulent flow can be experimentally determined, using examples from wind tunnel studies.
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Consider what techniques are often used in fluid dynamics experiments.

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