Discussion
Consider the following statements about raising the Reynolds number in a tunnel:
1. Pressurising the circuit raises it in proportion to the density.
2. Cooling the gas raises it by increasing density and reducing viscosity together.
3. Increasing the test speed raises it without any other consequence.
Which of the statements given above is or are correct?
Answer: D
The first two describe the two practical routes. The third ignores the consequence that matters: raising the speed also raises the Mach number, which is exactly the conflict that makes pressurised and cryogenic tunnels worth their cost.
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