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3 cards from this section. Quick, good the night before a test.
What is the formula for calculating the local coefficient of drag, C D star?
Remember it involves wall shear stress.
Define boundary layer thickness.
Think about the transition in flow velocity.
What is the definition of the local coefficient of drag?
Recall the formula for C D star.
True or False: The boundary layer thickness for turbulent flow increases faster than for laminar flow.
Think about the growth rates provided in the lecture.
You have a flat plate in a fluid with a free stream velocity of 2 m/s. Calculate the local coefficient of drag if the wall shear stress is found to be 0.15 N/m². Assume water density is 1000 kg/m³.
Don't forget to calculate the dynamic pressure correctly.
Given a boundary layer thickness of 5 mm for water flowing at 0.1 m/s, calculate τw and C D star, knowing the dynamic viscosity is 1.0 × 10^-3 N·s/m² and density is 1000 kg/m³.
Ensure you understand the relationship between shear stress and boundary layer thickness.
6 more questions in this section. Enroll free to practise them all.
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