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Capillary number

Index Capillary number

In fluid dynamics, the capillary number (Ca) 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. [1]

13 relations: Capillary action, Capillary pressure, Dimensionless quantity, Eötvös number, Fluid dynamics, Froude number, Gas, Liquid, Miscibility, Porous medium, Reynolds number, Surface tension, Viscosity.

Capillary action

Capillary action (sometimes capillarity, capillary motion, capillary effect, or wicking) is the ability of a liquid to flow in narrow spaces without the assistance of, or even in opposition to, external forces like gravity.

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Capillary pressure

In fluid statics, capillary pressure is the pressure between two immiscible fluids in a thin tube (see capillary), resulting from the interactions of forces between the fluids and solid walls of the tube.

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Dimensionless quantity

In dimensional analysis, a dimensionless quantity is a quantity to which no physical dimension is assigned.

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Eötvös number

In fluid dynamics the Eötvös number (Eo), also called the Bond number (Bo), is a dimensionless number measuring the importance of gravitational forces compared to surface tension forces and is used (together with Morton number) to characterize the shape of bubbles or drops moving in a surrounding fluid.

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Fluid dynamics

In physics and engineering, fluid dynamics is a subdiscipline of fluid mechanics that describes the flow of fluids - liquids and gases.

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Froude number

In continuum mechanics, the Froude number is a dimensionless number defined as the ratio of the flow inertia to the external field (the latter in many applications simply due to gravity).

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Gas

Gas is one of the four fundamental states of matter (the others being solid, liquid, and plasma).

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Liquid

A liquid is a nearly incompressible fluid that conforms to the shape of its container but retains a (nearly) constant volume independent of pressure.

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Miscibility

Miscibility is the property of substances to mix in all proportions (that is, to fully dissolve in each other at any concentration), forming a homogeneous solution.

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Porous medium

A porous medium or a porous material is a material containing pores (voids).

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Reynolds number

The Reynolds number is an important dimensionless quantity in fluid mechanics used to help predict flow patterns in different fluid flow situations.

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Surface tension

Surface tension is the elastic tendency of a fluid surface which makes it acquire the least surface area possible.

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Viscosity

The viscosity of a fluid is the measure of its resistance to gradual deformation by shear stress or tensile stress.

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References

[1] https://en.wikipedia.org/wiki/Capillary_number

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