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首页> 外文期刊>International Journal of Heat and Mass Transfer >Lateral Wetting Angle Of Falling Film In Dense Fluid
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Lateral Wetting Angle Of Falling Film In Dense Fluid

机译：稠密流体中降膜的横向润湿角

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摘要

An investigation of the wetting ability of a liquid-falling film on vertical steel and glass surfaces is performed by measuring the thickness and the width of the water falling film at 313 K. up to 27 MPa. An attempt to reconstruct the two-dimensional cross-section of the falling film was made. The cross-section of the falling film is assumed to have the shape of a circular segment.rnThe falling film wetting angle is compared with the sessile drop contact angle. The sessile drop contact angle represents the upper limit of the film wetting angle. A continuous increase in the mass flow at a constant pressure causes the spreading of the film. This happens when the force balance between the interfacial tensions and the dynamic forces, which deform the film geometry, is exceeded. However, if the pressure increases, the wettability goes down. This is partly due to the accumulation of liquid mass, which is caused by a larger buoyancy.rnThe critical mass flow, that is, the minimum mass flow needed to guarantee a wide covering film is reported. The disintegration point of a liquid film is directly affected by its wettability.
机译：通过在不超过27 MPa的313 K下测量降水膜的厚度和宽度来研究降液膜在垂直钢和玻璃表面上的润湿能力。尝试重建降膜的二维横截面。假定降膜的横截面具有圆形段的形状。rn将降膜的润湿角与固定液滴接触角进行比较。固着液滴接触角代表膜润湿角的上限。在恒定压力下质量流量的连续增加会导致薄膜扩散。当超出了界面张力和动态力之间的力平衡时，就会发生这种情况，这会使薄膜的几何形状变形。但是，如果压力增加，则润湿性下降。部分原因是由于较大的浮力引起的液体质量的积累。报告了临界质量流量，即保证宽覆盖膜所需的最小质量流量。液膜的崩解点直接受其润湿性影响。

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