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Mass Transfer - Engineering

Q1:

Schmidt number is given by

A

B Re.Pe

C Sh x Pe

D Re/Pe

ANS:A -

The Schmidt number (Sc) is defined as the ratio of momentum diffusivity (kinematic viscosity) to mass diffusivity. It is commonly used in fluid mechanics and heat transfer to characterize the relative importance of momentum and mass transfer in a fluid flow. Mathematically, the Schmidt number (Sc) is given by: ๐‘†๐‘=kinematic viscositymass diffusivitySc=mass diffusivitykinematic viscosityโ€‹ Or alternatively: ๐‘†๐‘=๐œ‡๐œŒ๐ทSc=ρDμโ€‹ Where:

  • ๐œ‡μ is the dynamic viscosity of the fluid,
  • ๐œŒρ is the density of the fluid,
  • ๐ทD is the mass diffusivity of the species being transported in the fluid.
The Schmidt number is important in various applications, such as in the study of diffusion-controlled processes, mass transfer in fluid flows, and the characterization of boundary layers in fluid dynamics.