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Mass Transfer - Engineering

Q1:

Corresponding to Nusselt number in heat transfer, the dimensionless group in mass transfer is the __________ number.

A Sherwood

B Schmidt

C Peclet

D Stanton

ANS:A - Sherwood

Corresponding to the Nusselt number in heat transfer, the dimensionless group in mass transfer is the Sherwood number. The Sherwood number (Sh) is a dimensionless group used in mass transfer to characterize the ratio of convective mass transfer to molecular mass transfer. It is analogous to the Nusselt number (Nu) in heat transfer. The Sherwood number can be expressed as: Sh=ℎ𝐿𝐷Sh=DhL​ Where:

  • ℎh is the convective mass transfer coefficient,
  • 𝐿L is a characteristic length (such as the distance over which mass transfer occurs),
  • 𝐷D is the mass diffusivity of the fluid.
Similar to the Nusselt number, the Sherwood number represents the enhancement of mass transfer due to convective effects relative to molecular diffusion. So, the correct answer is: Sherwood.