Discussion
A model is tested at \( 40 \) m/s in water rather than air. Taking water as \( 1000 \) times denser and \( 55 \) times more viscous, the Reynolds number is multiplied by about
Answer: C
Reynolds number goes as density over viscosity, so the factor is \( 1000/55 = 18.2 \). The same Reynolds number is therefore reached at roughly one eighteenth of the speed, which is exactly what makes unsteady vortex behaviour observable in a water tunnel.
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