Correct answer: (A) Prandtl in heat transfer is analogous to Schmidt in mass transfer.; (C) Prandtl is momentum diffusivity divided by thermal diffusivity.
Explanation
$Pr=\nu/\alpha$ and $Sc=\nu/D$ compare momentum diffusion with thermal and mass diffusion, respectively. Therefore A, C are correct. Small Pr implies thermal diffusivity is relatively large, contrary to B. Lewis number is $Le=\alpha/D=Sc/Pr$,not their product. Select **A, C**.
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