Which of the following has the lowest Prandtl number ?
Correct answer: C. Molten sodium (a coolant used in fast breeder reactor)
- A. Transformer oil
- B. Water
- C. Molten sodium (a coolant used in fast breeder reactor)
- D. Dilute H2SO4
Explanation
The Prandtl number is the ratio of momentum diffusivity to thermal diffusivity. Molten sodium has exceptionally high thermal diffusivity, giving it a much lower Prandtl number than water, oils or dilute sulfuric acid.
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