If ν is the kinematic viscosity of air–water vapour mixture and D_AB is the mass diffusivity of water vapour in air, the ratio ν/D_AB is known as:
Options:
(A) Stanton number
(B) Prandtl number
(C) Schmidt number
(D) Sherwood number
Official Answer Key:
C
Step-by-Step Solution & Explanation
Schmidt number Sc = ν/D_AB is the mass-transfer analogue of the Prandtl number (Pr = ν/α), comparing momentum diffusivity to mass diffusivity. Answer: C.
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