17.6.3 - Impact of Reynolds Number and Surface Roughness
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Practice Questions
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What is the formula for calculating Reynolds number?
💡 Hint: Identify the terms involved in the equation.
What does a high Reynolds number indicate about flow?
💡 Hint: Think about flow characteristics.
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Interactive Quizzes
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What does a Reynolds number greater than 4000 indicate?
💡 Hint: Relate the number to flow regime definitions.
True or False: A higher surface roughness always increases drag.
💡 Hint: Think of examples in design contexts.
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Challenge Problems
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Evaluate the drag force on an object with Cd = 0.7, A = 2 m², ρ = 1.225 kg/m³, and v = 30 m/s.
💡 Hint: Use the drag force formula correctly.
A smooth sphere has a Reynolds number of 2500. Discuss flow characteristics and if you expect high or low drag.
💡 Hint: Relate Re values back to flow characteristics.
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