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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 the total mass transfer rate (convection + diffusion) to the rate of diffusive mass transport, [1] and is named in honor of Thomas Kilgore Sherwood. It is defined as follows
The same restrictions described in the heat transfer definition are applied to the mass transfer definition. The Sherwood number can be used to find an overall mass transfer coefficient and applied to Fick's law of diffusion to find concentration profiles and mass transfer fluxes.
Sherwood's primary research area was mass transfer, and in 1937 he published the first major textbook in the field, Absorption and Extraction (republished 1974 as Mass Transfer). The Sherwood number is named in his honor: = where = overall mass transfer coefficient;
Dimensionless numbers (or characteristic numbers) have an important role in analyzing the behavior of fluids and their flow as well as in other transport phenomena. [1] They include the Reynolds and the Mach numbers, which describe as ratios the relative magnitude of fluid and physical system characteristics, such as density, viscosity, speed of sound, and flow speed.
mass transfer (advection–diffusion problems; total momentum transfer to diffusive mass transfer) Prandtl number: Pr = = heat transfer (ratio of viscous diffusion rate over thermal diffusion rate) Pressure coefficient: C P
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Sherwood number – (also called the mass transfer Nusselt number) is a dimensionless number used in mass-transfer operation. It represents the ratio of the convective mass transfer to the rate of diffusive mass transport.