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2 cards from this section. Quick, good the night before a test.
What is shear stress in fluids?
Think about forces acting on a flat surface.
What does viscosity measure?
Consider thicker liquids like honey.
What is the formula for Reynolds number?
Remember it’s a ratio involving forces.
True or False: An increase in viscosity leads to a lower Reynolds number.
Think about what happens when a fluid becomes thicker.
Calculate the forces acting on a model car in a wind tunnel if the drag coefficient is 0.3, frontal area is 2m², and air density is 1.225 kg/m³ at a velocity of 15 m/s.
Use the drag force formula to calculate.
For water flowing over a sphere with a diameter of 0.2m at a velocity of 1m/s, calculate the Reynolds number given water's density is 1000 kg/m³ and viscosity is 0.001 Pa.s. Is the flow laminar or turbulent?
Remember the flow type depends on the value of the Reynolds number.
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