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In fluid dynamics, the capillary number represents the relative effect of viscous forces versus surface tension acting across an interface between a liquid and a gas, or between two immiscible liquids. It is defined as

\text{Ca} \ \stackrel{\mathrm{def}}{=}\ \frac{\mu v}{\sigma}

where μ is the viscosity of the liquid, v is a characteristic velocity and σ is the surface or interfacial tension between the two fluid phases.

For low capillary numbers (a rule of thumb says less than 10 - 5), flow in porous media is dominated by capillary forces.

[edit] See also

v • d • e
Dimensionless numbers in fluid dynamics
Archimedes • Atwood • Bagnold • Biot • Bond • Brinkman • Capillary • Cauchy • Damköhler • Dean • Deborah • Eckert • Ekman • Eötvös • Euler • Froude • Galilei • Grashof • ‎Görtler • Hagen • Knudsen • Laplace • Lewis • Mach • Magnetic Reynolds • Marangoni • Morton • Nusselt • Ohnesorge • Péclet • Prandtl • Rayleigh • Reynolds • Richardson • Roshko • Rossby • Ruark • Schmidt • Sherwood • Stanton • Stokes • Strouhal • Suratman • Taylor • Weber • Weissenberg • Womersley

de:Kapillarzahl tr:Kapilarite

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