Sherwood Number represents the ratio of what?

Sherwood Number represents the ratio of what?

• A. Ratio of convective mass transfer to diffusive mass transport
• B. Ratio of convective heat transfer to conductive heat transfer
• C. Ratio of diffusion to convection
• D. Ratio of convective mass transfer to diffusive mass transport

Answer: (A)

The Sherwood number tells you how much convection boosts mass transfer compared with diffusion. It is defined as the ratio of the convective mass-transfer rate to the diffusive (molecular) mass-transport rate, essentially comparing how quickly a species is removed from or delivered to a surface by bulk flow versus by diffusion alone. This makes it directly analogous to the Nusselt number for heat transfer. In practical terms, if there’s little or no flow so diffusion dominates, the Sherwood number is near 1; as flow increases and convection drives more transport, the Sherwood number rises, indicating enhanced mass transfer. It is not about heat transfer, and it is not the ratio of diffusion to convection; it is specifically convective transport relative to diffusive transport for mass.

The Sherwood number tells you how much convection boosts mass transfer compared with diffusion. It is defined as the ratio of the convective mass-transfer rate to the diffusive (molecular) mass-transport rate, essentially comparing how quickly a species is removed from or delivered to a surface by bulk flow versus by diffusion alone. This makes it directly analogous to the Nusselt number for heat transfer. In practical terms, if there’s little or no flow so diffusion dominates, the Sherwood number is near 1; as flow increases and convection drives more transport, the Sherwood number rises, indicating enhanced mass transfer. It is not about heat transfer, and it is not the ratio of diffusion to convection; it is specifically convective transport relative to diffusive transport for mass.