Discussion
Consider the following statements about the Reynolds number:
1. It compares inertial with viscous forces.
2. Matching it between model and full scale is a central difficulty in wind-tunnel testing.
3. Transition on a smooth flat plate occurs at a fixed value of about five hundred thousand.
Which of the statements given above is or are correct?
Answer: A
The first two are correct. The third treats a rough guide as a constant: the transition Reynolds number depends heavily on roughness, free-stream turbulence, noise and pressure gradient, and can vary by an order of magnitude.
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