Mechanism of directional water transport. (IMAGE)
Caption
(A) Illustration of directional water transport through the spot channel between elliptical yarns with gradient wettability. (B) Illustration of an axisymmetric water fluid front between elliptical yarns. Here, a and b are the semi-principal axes in x and y directions, respectively; c is the half-distance between yarns; θ is the CA; ω is the eccentric anomaly; α is the expansion/contraction angle; and β is the direction angle. (C) Dependence of direction angle on the eccentric anomaly of the elliptical yarns in different flow directions. (D) Dependence of capillary pressure on the eccentric anomaly of the elliptical yarns in different flow directions. (E) Mechanical analysis of the water drop hung under the porous spot of the horizontally placed fibrous layer with increasing water supply. (F) Relationship between the size of the porous spot and the volume of the dripped water drop. (G) Mechanical analysis of the water drop attached on the porous spot of the inclined fibrous layer at an inclined angle of λ.
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