Lewis number, which is important in problems involving simultaneous heat and mass transfer, is the ratio of__________________?
Correct answer: B. Thermal diffusivity to mass diffusivity
- A. Mass diffusivity to momentum diffusivity
- B. Thermal diffusivity to mass diffusivity
- C. Momentum diffusivity to thermal diffusivity
- D. None of these
Explanation
The Lewis number compares thermal diffusivity with mass diffusivity: Le = α/D. It indicates how rapidly heat spreads relative to species diffusion during simultaneous heat and mass transfer.
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