If Prandtl number is greater than the Schmidt number, then the____________________?
Correct answer: A. Thermal boundary layer lies inside the concentration boundary layer
- A. Thermal boundary layer lies inside the concentration boundary layer
- B. Concentration boundary layer lies inside the thermal boundary layer
- C. Thermal & concentration boundary layers are of equal thickness
- D. Hydrodynamic (i.e., momentum) boundary layer is thicker than the other two
Explanation
Prandtl number compares momentum diffusivity with thermal diffusivity, while Schmidt number compares momentum diffusivity with mass diffusivity. Pr > Sc therefore means thermal diffusivity is lower than mass diffusivity, so the thermal boundary layer is thinner and lies inside the concentration boundary layer.
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