By Edward Yu Bormashenko
The challenge of wetting and drop dynamics on quite a few surfaces is particularly attention-grabbing from either the scientificas good as thepractical point of view, and topic of excessive research.The effects are scattered throughout papers in journals, sothis workwill meet the necessity for a unifying, complete paintings
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2V r 2 C 4 12 2 V . 15 Measurement of surface tension of solids 43 W In equilibrium ddr D 0; hence, we obtain an equation allowing calculation of the interfacial tension: Â Ã3=2 1 3 1 2 2 V ! 69) contains parameters which could be easily established experimentally with high accuracy, i. , the length of the spinning droplet L, its volume V , and the difference between the densities of the liquids. This method turns out to be extremely suitable for measurement of low interfacial tensions which occur in water/oil systems in the presence of surfactants.
45); "0 is the vacuum permeability, "1 and "2 are dielectric constants of liquid and air respectively, and is the surface tension of the liquid. The experiments reported in [9] confirmed the linear dependence of the drop eccentricity on the value of the applied electric field. It should be stressed that the switch in the direction of the electric field does not change the effect of the droplet deformation, i. , the electric field always stretches the droplet and does not compress it. 15). 13. Experimental set used for study of the deformation of water droplets exposed to an electric field.
Fermi, have shown that the shape of the electrically deformed dielectric droplet could be approximated by a prolate spheroid [13, 35]. "1 C 2"2/ where Req is the radius of the spherical droplet of the same volume [9,13]. 45); "0 is the vacuum permeability, "1 and "2 are dielectric constants of liquid and air respectively, and is the surface tension of the liquid. The experiments reported in [9] confirmed the linear dependence of the drop eccentricity on the value of the applied electric field. It should be stressed that the switch in the direction of the electric field does not change the effect of the droplet deformation, i.