The wavy structure of a liquid film sheared by high-velocity gas flow with droplet entrainment from the film surface has been investigated. The paper presents an analysis of methods for measuring the local fluid film thickness and a review of classical concepts of the wave hydrodynamics of annular dispersed flow obtained in early studies using rather crude methods. A systematic description of the structure, evolution, and interaction of waves of various types is given based on an analysis of high-resolution spatio-temporal records of film thickness obtained by laser-induced fluorescence. The results are compared with the results of recent experiments, and the necessity of revising some classical concepts is shown. Directions for further research are suggested.

中文翻译：

---

环状分散气液流中液膜波状结构的研究进展

研究了高速气流剪切的液膜的波浪结构，液滴夹带从膜表面。本文分析了测量局部流体膜厚度的方法，并回顾了早期研究中使用相当粗糙的方法获得的环形分散流波浪流体动力学的经典概念。基于对激光诱导荧光获得的薄膜厚度的高分辨率时空记录的分析，给出了对各种类型波的结构、演化和相互作用的系统描述。将结果与最近的实验结果进行比较，表明修改一些经典概念的必要性。提出了进一步研究的方向。