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4 cards from this section. Quick, good the night before a test.
What is shear stress?
Consider the force acting along the surface!
List the four layers of turbulent flow.
Think about the flow's proximity to the boundary.
What does τ not represent in turbulent flow?
Think about the definition of τ not and its significance.
The viscous sublayer has a linear velocity profile.
Remember what characterizes this specific layer!
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.
Don’t forget to convert units appropriately and use known values for kinematic viscosity to find Re*.
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?
Remember that the velocity defect measures the difference in velocities within the turbulent flow!
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