capillary number


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capillary number

[′kap·ə·ler·ē ‚nəm·bər]
(fluid mechanics)
A dimensionless number associated with a liquid that compares the intensity of liquid viscosity and surface tension, equal to μ V /σ, where μ is the viscosity, σ is the surface tension, and V is a fluid velocity such as the deposition velocity on a solid that is drawn out of the liquid.
References in periodicals archive ?
He found that the deformation of such a droplet is described by two dimensionless parameters, namely the viscosity ratio, [lambda], and the capillary number, Ca.
In the classical Newtonian micro-rheology, dispersed droplet deformation and breakup depend on two dimensionless numbers: the capillary number and the viscosity ratio [lambda].
Our results are consistent with both theoretical expectations and most previous literature in showing that the critical capillary number increases with increasing droplet elasticity and with decreasing matrix elasticity.
The capillary number is the ratio of stress to the interfacial tension force per unit area, K = [sigma]d/[[nu].
From Eq 1 and Table 1, the critical capillary number can be determined.
The capillary number and viscosity ratio are key factors influencing the deformation and breakup of the dispersed phase.
b] corresponds to the time that a droplet needs to break up under flow corresponding to the critical capillary number [Ca.
The Capillary number is a ratio of shear force to interfacial force (Ca = [[eta].
Its shape depends on two parameters: the capillary number, Ca, and the viscosity ratio.
Though in our experiments, the local capillary number always exceeds 400, in commercial die line formation, it can approach unity.
The critical capillary number of 7 has instead been estimated using Figure 5 in H.
5 and 6, it can be summarized that the capillary number Ca defined by Ca = [[eta].