Dittus-Boelter equation cannot be used for molten metals mainly due to its very low_____________________?
Correct answer: A. Prandtl number
- A. Prandtl number
- B. Grashoff number
- C. Thermal conductivity
- D. Viscosity
Explanation
The Dittus-Boelter correlation is unreliable for molten metals because their Prandtl numbers are extremely low, indicating very high thermal diffusivity relative to momentum diffusivity. Its usual range is intended for ordinary fluids with higher Prandtl numbers.
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