FIG 4 - uploaded by Alexandr Malijevsky
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Schematic illustration of two possible condensed capillary liquid phases in the H∞ geometry. In the top panel (a) the two circular menisci are pinned at the upper edges which they meet at an edge contact angle θe which is pressure dependent and takes the value θ cc e at type I capillary condensation. The bottom of the menisci meets the horizontal, lower wall at the equilibrium contact angle θ. In the lower panel (b), indicative of type II condensation, the two circular menisci are unpinned, spilling out into the right-angle corners and meet the vertical and lower walls at the contact angle θ. In the lower panel we illustrate the meniscus length, , overspill area, S, and lateral extent along the bottom wall, X, and above the corner. Similar considerations apply when the meniscus is pinned.
Source publication
We study the low temperature phase equilibria of a fluid confined in an open capillary slit formed by two parallel walls separated by a distance $L$ which are in contact with a reservoir of gas. The top wall of the capillary is of finite length $H$ while the bottom wall is considered of macroscopic extent. This system shows rich phase equilibria ar...
Contexts in source publication
Context 1
... Since the bottom wall is infinite the menisci must meet it at Young's equilibrium contact angle θ. There are in principle, however, two possibilities for the upper part of each menisci. For sufficiently long slits the upper part of the menisci connects with, and is pinned at, the edge, making an angle θ e with the horizontal (upper) wall (see Fig. 4a). This new edge contact angle is pressure dependent for any CL phase but takes a specific value θ cc e at capillary condensation (which we stress is different to that defined for the HH geometry). We refer to this as type I capillary condensation. For shorter capillaries, however and for sufficiently small contact angles θ we shall ...
Context 2
... geometry). We refer to this as type I capillary condensation. For shorter capillaries, however and for sufficiently small contact angles θ we shall show that the circular menisci are no longer pinned at the upper edges but rather sit entirely outside the open ends and touch the bottom and vertical walls with the equilibrium contact angle θ (see Fig. 4b). We refer to this as type II capillary condensation. In the top panel (a) the two circular menisci are pinned at the upper edges which they meet at an edge contact angle θe which is pressure dependent and takes the value θ cc e at type I capillary condensation. The bottom of the menisci meets the horizontal, lower wall at the ...
Context 3
... the arc length of each meniscus involving both Young's contact angle and the edge contact angle (see Fig. 4). Setting ∆Ω = 0 determines that type I capillary condensation occurs ...
Context 4
... the arc length of each meniscus (see Fig. 4). None of these expressions involve an edge contact angle since there is no pinning. Setting ∆Ω = 0 determines that type II capillary condensation occurs at the pressure ...
Context 5
... Since the bottom wall is infinite the menisci must meet it at Young's equilibrium contact angle θ. There are in principle, however, two possibilities for the upper part of each menisci. For sufficiently long slits the upper part of the menisci connects with, and is pinned at, the edge, making an angle θ e with the horizontal (upper) wall (see Fig. 4a). This new edge contact angle is pressure dependent for any CL phase but takes a specific value θ cc e at capillary condensation (which we stress is different to that defined for the HH geometry). We refer to this as type I capillary condensation. For shorter capillaries, however and for sufficiently small contact angles θ we shall ...
Context 6
... geometry). We refer to this as type I capillary condensation. For shorter capillaries, however and for sufficiently small contact angles θ we shall show that the circular menisci are no longer pinned at the upper edges but rather sit entirely outside the open ends and touch the bottom and vertical walls with the equilibrium contact angle θ (see Fig. 4b). We refer to this as type II capillary condensation. In the top panel (a) the two circular menisci are pinned at the upper edges which they meet at an edge contact angle θe which is pressure dependent and takes the value θ cc e at type I capillary condensation. The bottom of the menisci meets the horizontal, lower wall at the ...
Context 7
... the arc length of each meniscus involving both Young's contact angle and the edge contact angle (see Fig. 4). Setting ∆Ω = 0 determines that type I capillary condensation occurs ...
