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>Investigation of Single and Binary of “Sandwich” Type Convex Liquid Capillary Bridges, Stretched between Two Flat Surfaces (Experimental Approach)
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Investigation of Single and Binary of “Sandwich” Type Convex Liquid Capillary Bridges, Stretched between Two Flat Surfaces (Experimental Approach)
The interest to monophasic liquid capillary bridges (CB) has a long history. These shapes are attractive not only because of their interesting surface properties but also because of the possibility of their behavior to be analytically predicted by the equations of differential geometry. In the current paper we extend our previous studies by implementation of an approach for prediction of liquid gravityless CB behavior during their quasi-static stretching. It was found, that a simple linear relation, h r m ~ ln R r m , is valid the case of good wetting, 0° ≤ θ ≤ 90°, where h is the height of CB, R is the radius at the contact surface, rm is the CB waist radius, and θ is the solid/liquid (static, receding) contact angle. We experimentally studied the geometrical properties evolution of monophasic cedar oil and water CBs between two glass plates during their quasi-static (stepwise with equilibration after each step for 1–2 min.) stretching. In addition, we investigated a binary CB of a new type, resembling “sandwich”. There, due to the stronger glass wetting by the water, the oil phase is adhered at the water/gas interface, partially engulfed with a tendency to stand in the zone around the waist (minimal surface energy). During the stretching, it tends to replace the water in the CB waist region. A simple mechanism for interaction of the two immiscible liquids leading to creation of “sandwich” like binary structures, is proposed. Experiments of capillary bridges (CB) stretching between two flat surfaces have been carried for all liquids at different volume proportions. The investigation is extended also to identification of CB profile generatrix shape. We experimentally found that for monophasic CB, it can be described by a circle during the quasi-static stretching. If the CB height is increased, before the rupture, the shape evolves consecutively to an ellipse, parabola, or possibly to a hyperbola. The investigated binary CB evolves a similar way. Conclusions are drawn and directions for further investigations are given.
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机译：单表液体毛细血管桥（CB）的兴趣具有悠久的历史。这些形状不仅具有吸引力，不仅是因为它们的有趣的表面特性，而且因为它们的行为可以通过差分几何形状的方程来分析预测的可能性。在目前的论文中，我们通过实施预测其准静态拉伸期间液体重力CB行为的方法来扩展我们以前的研究。它被发现，即简单的线性关系，H R M〜LN R R M，效果好润湿，0°。 ＆le; ＆theta; ＆le; 90＆Deg;，其中H是Cb的高度，R是接触表面的半径，RM是Cb腰半径，和＆Thea;是固体/液体（静态，后退）接触角。我们通过在Quasi-static期间通过实验研究了两个玻璃板之间的单体雪松油和水CBS的几何特性演化（在每个步骤后逐步进行平衡1＆ndash; 2分钟。）拉伸。此外，我们还调查了一种新型的二进制CB，类似于＆ldquo;三明治＆rdquo;在那里，由于水润湿的玻璃更强，油相粘附在水/气体界面处，部分地吞并围绕腰部的区域（最小表面能）倾向于站在区域中。在拉伸期间，它倾向于更换CB腰部区域中的水。一个简单的机制，用于互相不混溶的液体互动，导致创建＆ldquo;三明治＆rdquo;如二元结构，提出。在两个平坦表面之间拉伸的毛细管桥（CB）的实验已经为不同体积比例的所有液体携带。调查也扩展到识别CB型材Persontix形状。我们通过实验发现，对于单级Cb，可以在准静态拉伸期间通过圆形来描述。如果在破裂之前Cb高度增加，则形状连续地发展到椭圆，抛物线，或可能对双曲线。调查的二进制CB演变了类似的方式。得出结论，给出了进一步调查的指示。
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