The ratio of hydrodynamic boundary layer to thermal boundary layer thickness in case of liquid metals is__________________?
Correct answer: A. < 1
- A. < 1
- B. 1
- C. > 1
- D. 2
Explanation
Liquid metals have very low Prandtl numbers, meaning thermal diffusivity is much greater than momentum diffusivity. Their thermal boundary layer is therefore thicker than the hydrodynamic layer, making the ratio less than one.
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