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3 cards from this section. Quick, good the night before a test.
What is the equation for calculating the thickness of the viscous sublayer?
Look for the relationship between viscosity and friction velocity.
Define wall shear stress.
It is crucial for the calculation of head loss.
What governs the shear stress in the viscous sublayer?
Think about where viscosity plays its role in flow.
True or False: The equation for head loss is only applicable in laminar flow.
Recall our discussion regarding flow characteristics.
A fluid has a dynamic viscosity of 1.005 x 10^-3 Pa.s and a density of 1000 kg/m³. Calculate the wall shear stress, assuming a pressure gradient of 2000 Pa/m, for a pipe of diameter 0.05 m.
Remember to relate shear stress to the pressure gradient and pipe diameter.
Given the calculated wall shear stress and a kinematic viscosity of 1.004 x 10^-6 m²/s, determine the thickness of the viscous sublayer.
Ensure you're using the correct equation for thickness with all constants converted.
5 more questions in this section. Enroll free to practise them all.
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