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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