Which has the lowest Prandtl number ?
Correct answer: A. Liquid metal
- A. Liquid metal
- B. Aqueous solution
- C. Water
- D. Lube oil
Explanation
Prandtl number is the ratio of momentum diffusivity to thermal diffusivity, and liquid metals have exceptionally high thermal diffusivity. Their Prandtl numbers are therefore much lower than those of water, aqueous solutions, and oils.
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