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 ?
Perfect dripping occurred when both capillary number ([Ca.sub.outer] [member of] (0.018, 0.09)) and Weber number ([We.sub.drop] [member of] (8.7 x [10.sup.-4], 9.96 x [10.sup.-3])) were simultaneously low enough.
[7] described the deformation process of fluid drops and gas bubbles in a microscale T-shape flow channel and pointed out that fluid drop bursting mainly depended on differential pressure in case of small capillary number. Fang et al.
is the capillary number. Here, [U.sub.CL] is the contact line velocity and [[mu].sub.L] is the liquid viscosity.
At high capillary number (Ca) value, the fluid will occur completely through flow field, which does not show the recirculation zone on free surface.
The capillary number was determined according to the number of adipocytes in the field at a magnification of 40x.
Capillary number theory is regarded as the basic theory in polymer flooding, surfactant flooding, polymer-surfactant flooding (SP), and alkali-surfactant-polymer flooding (ASP), which are more appealing enhanced oil recovery (EOR) techniques in low oil price era.
The present study aims to investigate and systematize the morphoquantitative parameters of the sciatic nerves, including the number of fascicles, nerve area, minimum diameter of fascicles, number and density of myelinated fibers, minimum diameter of the myelinated fiber and respective axons, myelin sheath area, fiber distribution histograms, relation between axon diameter and myelin area, and capillary number and area.
The influences of various relevant parameters such as unsteadiness parameter S, Hartmann number Ma, the Prandtl number Pr, the Schmidt number Sc, the thermocapillary number [M.sub.1], and the solutal capillary number [M.sub.2] on the flow field are elucidated through graphs and tables.
The liquid film covered the roll surface with a finite thickness on the lands below the critical capillary number. An increase in the capillary number led to a transition from a fully filled to a starved configuration, in which the liquid barely remained on the lands and partly filled the grooves with a concave surface profile.
The immunohistological assessment revealed that the capillary number to muscle fiber ratios increased in skeletal muscles of the transplanted hindlimbs, and intraepidermal nerve fiber densities were also ameliorated in the transplanted plantar skin samples.
evaluated the effects of topical calcipotriol and betamethasone, alone and in combination, on the typical "bushy" capillaries of psoriatic lesions, reporting that after only 15 days of therapy, the "bushy" diameter and capillary number showed a marked reduction, which was significantly higher with calcipotriol and betamethasone association compared with the single therapies.
In 1973, Foster studied the relation between the capillary number ([micro]v/[delta]) and the oil recovery.