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3 cards from this section. Quick, good the night before a test.
Define wall shear stress.
Think about what causes friction in fluid flow.
What shape does the velocity profile take in laminar flow?
Consider how layers of fluid move smoothly in laminar conditions.
What does wall shear stress represent in fluid flow?
Consider what resistance the fluid faces against the pipe walls.
True or False: The Moody chart is only applicable to circular pipes.
Think about how we can apply concepts from circular flows to other shapes.
If a turbulent flow in a pipe has a Reynolds number of 4 million, and the relative roughness is 0.01, what is the friction factor using the Moody chart?
Study the chart closely; you will observe different zones.
For a non-circular duct with a hydraulic diameter of 0.2m, if the flowing viscosity is 0.001 Pa.s at a velocity of 3m/s, calculate the wall shear stress.
Remember to find the density first and adjust for the hydraulic diameter.
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