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3 cards from this section. Quick, good the night before a test.
What is shear stress and how is it calculated?
Think of how forces are distributed over an area.
Define Reynolds number.
Remember the ratio it represents.
What is the definition of shear stress?
Think of how force is applied on surfaces.
True or False: The Reynolds number is used to predict both turbulence and viscosity in fluids.
Recall what Reynolds number measures.
A cylindrical object of radius 0.25 m is submerged in a fluid with a viscosity of 0.002 Pa.s and moving at 4 m/s. What is the Reynolds number, and how would you classify the flow?
Use given parameters to substitute into Reynolds number formula.
In a testing scenario, a model car has a frontal area of 0.02 m² and a drag coefficient of 0.3. If tested at a velocity of 25 m/s, how much drag force can we estimate on the full-scale car with a frontal area of 1.2 m²?
Don’t forget to scale the drag coefficient for practical use.
4 more questions in this section. Enroll free to practise them all.
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