The Sherwood number (Sh) (also called the mass transfer Nusselt number) is a dimensionless number used in mass-transfer operation. It represents the ratio of convective mass transport to diffusive mass transport.
It is defined as follows
where
- L is a characteristic length (m)
- D is mass diffusivity (m2.s−1)
- K is the mass transfer coefficient (m.s−1)
Using dimensional analysis, it can also be further defined as a function of the Reynold and Schmidt numbers:
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