Sherwood Number Calculator
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The
Sherwood number represents the link between convective mass transfer and
diffuse mass transportation and is used in analyzing mass transfer systems such
as liquid-liquid removal. This article describes the number and traditional
formulations of Sherwood.
Numbers
without dimensions play an important part in the study of fluid dynamics and
problems with heat and mass transfer. They provide a way of characterizing
complex phenomena, often through a direct comparison of the individual numbers.
A summary of dimensionless numbers and formulas for their measurement can be
found in this article.
Definition:
The
number of Sherwood is a dimensionless number named after Thomas Kilgore
Sherwood and defines the convective mass transfer ratio to the large mass
transfer rate. It is the Nusselt Number mass transfer equivalent and is
formulated as follows:
Sh=h/(D/L)
Where h is the convective mass the transfer rate and D/L is the mass diffusion rate.
For gas systems an
alternative formulation utilizing the gas phase mass transfer coefficient k can
be used:
Sh=kRT/DP
Heat Transfer Link
Sherwood number can be
defined in accordance with the Reynolds Number and Schmidt Number by
dimensional analysis. In this case, the number of Schmidt is equivalent to the
number of Prandtl.
This relationship is useful because it permits heat transfer connections to be used for mass transmission analysis to calculate the Nusselt number. This is done by replacing the number of Sherwood with the number of Nusselt and the number of Schmidt with Prandtl.
Example:
Calculate the Sherwood Number for the given details.
Mass Transfer Coefficient (k) = 10 m/s
Characteristic Length (L) = 20 m
Diffusion Coefficient (D) = 10 m2/s
Solution:
Apply Formula:
Sh = kl/D
Sh = 5*15/10
Sh = 7.5
Sherwood Number (Sh) = 7.5
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