Sherwood number
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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 to diffusive mass transport, and is named in honor of Thomas Kilgore Sherwood.
It is defined as follows
Sh = Km * Lc / D
Lc = Characteristic length scale
D = Diffusivity
k = Mass transfer coefficient
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