The statistical characteristics of a water film freely falling down a large vertical flat plate were investigated. The thickness of liquid film was measured by using the capacitance probe. The effects of the film flow rate and the solid surface on the thickness and coverage of falling film were examined and discussed, and the correlation of film thickness based on Reynolds number was obtained. With the flow rate increasing, the coverage will enlarge but the thickness will remain after the critical film thickness is achieved, and there is a larger coverage for the plate with a smaller contact angle at the same flow.%对冷态降液膜在大平板上的流动特性进行了实验研究,运用电容式精密测微仪测定垂直降液膜的厚度,考察了在无蒸发情况下雷诺数对降液膜厚度和流量对液膜覆盖率的影响规律,得到平均膜厚经验关系式,并认为液膜在达到临界膜厚后,随流量增加只会使覆盖率增大而厚度几乎不变,发现同流量下接触角较小的平板上液膜覆盖率较大.
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