Prandtl number for most of dry gases is about________________?
Correct answer: B. 0.72
- A. 0.001
- B. 0.72
- C. 70
- D. 150
Explanation
For dry gases, the Prandtl number, Pr = Cpμ/k, is usually close to 0.7 because momentum and thermal diffusivities are of similar magnitude. The value 0.72 is therefore the appropriate estimate.
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