4.1 - Hydrodynamically Rough and Smooth Boundaries
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Practice Questions
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Define shear stress in fluid dynamics.
💡 Hint: Think about the forces acting on a wall.
What is the significance of the viscous sublayer?
💡 Hint: Consider how this relates to flow characteristics.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is the shear stress formula?
💡 Hint: Think of the relationship between stress and velocity.
A smooth boundary has k/δ < 0.25. Is this true or false?
💡 Hint: Recall the definitions we just talked about.
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Challenge Problems
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A pipe flowing with oil has surface irregularities height k = 0.2 mm, τ₀ = 3 N/m², and ν = 0.005 Stokes. Classify the boundary and discuss the implications.
💡 Hint: Remember to perform each calculation step by step.
If the viscous sublayer is significantly thinner than the irregularities present, what is likely the effect on frictional losses in a system with turbulent flow?
💡 Hint: Consider how turbulence affects energy loss.
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