22.7.4 - Viscous Sublayer in High Reynolds Number Flows
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Practice Questions
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What is the viscous sublayer?
💡 Hint: Think of where friction most affects the flow near surfaces.
What does the Reynolds number indicate?
💡 Hint: Recall the factor that determines whether flow is laminar or turbulent.
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Interactive Quizzes
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What is the viscous sublayer?
💡 Hint: Consider where viscous effects are most significant.
True or False: The Moody chart is only useful for laminar flow.
💡 Hint: Think about what flow types the chart encompasses.
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Challenge Problems
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Given a pipe with a diameter of 0.5 m flowing at a Reynolds number of 400,000, calculate the wall shear stress if the fluid has a viscosity of 0.001 Pa.s.
💡 Hint: Utilize wall shear stress formulas and the relationships from Nikuradse’s experiments.
If the flow in a non-circular conduit reaches a Reynolds number of 3 million, how might the viscous sublayer behave differently than in a lower Reynolds flow? Describe the consequences.
💡 Hint: Discuss the transitions observed in behavior as the Reynolds number increases.
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