Discussion
Assertion (A): Water tunnels are favoured for studying delta-wing vortex behaviour.
Reason (R): The same Reynolds number is reached at a far lower speed in water than in air.
Select the correct answer from the options below.
Answer: D
Both are true and the second explains the first. Roughly eighteen times lower speed for the same Reynolds number means the flow evolves slowly enough to film and interpret, and dye injection gives a clarity that smoke in air cannot match.
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