en>Rjwilmsi: Journal cites, added 1 DOI using AWB (9887)

2014-01-25T16:01:16Z

Journal cites, added 1 DOI using AWB (9887)

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In [[fluid dynamics]] through [[porous media]], the '''Darcy number''' ('''Da''') represents the relative effect of the permeability of the medium versus its cross-sectional area—commonly the [[hydraulic radius|diameter]] squared. The number is named after [[Henry Darcy]] and is found from nondimensionalizing the differential form of [[Darcy's Law]]. This number should not be confused with the [[Darcy friction factor]] which applies to [[pressure]] drop in a pipe. It is defined as

:<math>
\mathrm{Da} = \frac{K}{d^2}
</math>

where
* ''K'' is the permeability of the medium;
* ''d'' is the diameter of the particle.<ref>http://dx.doi.org/10.1016/S0017-9310(02)00109-6</ref>

Alternate forms of this number do exist depending on the approach that Darcy's Law is made dimensionless and the geometry of the system.<ref>http://www.thermopedia.com/content/684/</ref> The Darcy number is commonly used in [[heat transfer]] through porous media.<ref>http://sharif.ir/~anouri/JP/13.pdf</ref>

==See also==
* [[Capillary pressure]]
* [[Dimensionless quantity]]

==References==

{{Reflist}}

{{NonDimFluMech}}

{{DEFAULTSORT:Darcy Number}}
[[Category:Dimensionless numbers of fluid mechanics]]
[[Category:Engineering]]

{{Fluiddynamics-stub}}

Dual-beta - Revision history

en>Rjwilmsi: Journal cites, added 1 DOI using AWB (9887)