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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is shear stress?
💡 Hint: Consider the force acting along the surface!
Question 2
Easy
List the four layers of turbulent flow.
💡 Hint: Think about the flow's proximity to the boundary.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What does τ not represent in turbulent flow?
- Average velocity
- Shear stress at the wall
- Viscous force
💡 Hint: Think about the definition of τ not and its significance.
Question 2
The viscous sublayer has a linear velocity profile.
- True
- False
💡 Hint: Remember what characterizes this specific layer!
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
A 0.1 m diameter pipe carries water at a velocity of 3 m/s. If the shear stress on the wall is given as 5 N/m², calculate the friction velocity and determine if the boundary is smooth, transitional, or rough using k = 0.1 mm.
💡 Hint: Don’t forget to convert units appropriately and use known values for kinematic viscosity to find Re*.
Question 2
Calculate the velocity defect for water at a pipe wall using the velocity at the center and the velocity 1 cm from the wall. If the center velocity is 5 m/s and the velocity at 1 cm is 2.5 m/s, what is the defect?
💡 Hint: Remember that the velocity defect measures the difference in velocities within the turbulent flow!
Challenge and get performance evaluation