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Mass Transfer - Engineering

Q1:

The Schmidt number which is defined as, μ/ρ D, is the ratio of the

A momentum diffusivity to the mass dif-fusivity.

B thermal diffusivity to the mass diffusivity.

C momentum diffusivity to the thermal diffusivity.

D none of these.

ANS:A - momentum diffusivity to the mass dif-fusivity.

The Schmidt number (𝑆𝑐Sc) is a dimensionless quantity used in fluid mechanics and heat transfer to characterize the relative importance of momentum diffusivity (kinematic viscosity), thermal diffusivity, and mass diffusivity in a fluid. The Schmidt number is defined as: 𝑆𝑐=𝜇𝜌𝐷Sc=ρDμ​ Where:

  • 𝜇μ is the dynamic viscosity (momentum diffusivity) of the fluid,
  • 𝜌ρ is the density of the fluid, and
  • 𝐷D is the mass diffusivity of the fluid.
Therefore, the Schmidt number is the ratio of momentum diffusivity to mass diffusivity. So, the correct answer is: momentum diffusivity to the mass diffusivity.