For what value of Prandtl number, St = f/2 ?
Correct answer: B. 1
- A. 1.5
- B. 1
- C. > 1
- D. < 1
Explanation
The Reynolds analogy gives St = f/2 when the momentum and thermal diffusivities are equal, which corresponds to Pr = 1. For other Prandtl numbers, the velocity and temperature boundary layers do not have the same behavior.
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