Model for Two Infinite Vertical Plates

The boundary conditions at the plate walls are given by the contact angles as 

Interface profiles for (a) a moderate separation and (b) a small separation between the plates (c) horizontal component of the dimensionless force between the plates vs. separation (0 = 45° and 9 = 120°). In (a) and (b), the thick solid lines represent the plates the black dashed line indicates the liquid level at infinity and the thin solid lines denote the air-liquid interface. 

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