基于横向剪切干涉系统的液膜厚度分布检测

doi:10.16085/j.issn.1000-6613.2023-1379

摘要/Abstract

摘要：

测量液体薄膜的厚度在众多科学和工程领域中都具有重要的应用价值。本文基于横向剪切干涉技术，通过条纹追踪算法对相机拍摄得到的液膜干涉图像进行处理，研究了三角形与矩形竖直自由平面液膜的厚度分布及时间演变。实验结果表明，三角形液膜厚度范围为0.98~9.37μm，矩形液膜厚度范围为0.1~13μm。受重力影响，液膜厚度从顶部到底部逐渐增大，而在水平方向上液膜厚度分布均匀。随着时间的推移，重力排液导致液膜整体厚度逐步减小，顶部最薄弱处厚度率先到达最小值0.08μm后液膜整体破裂。进一步对矩形液膜进行分析，整个排液过程中液膜最大体积为2.66mm³，最大体积流量为0.28mm³/s。此外，通过干涉条纹的分布变化可实现液膜表面流场可视化，为液膜微观表面流场研究提供了新的研究方法。

关键词: 横向剪切干涉, 液膜厚度, 排液, 两相流, 光学测量

Abstract:

Measuring the thickness of liquid films has important applications in many scientific and engineering fields. In this paper, based on the transverse shear interferometry technique, the thickness distribution and time evolution of the triangular and rectangular vertical free-plane liquid films were investigated. The streak-tracking algorithm was used to process the interference images of the liquid film taken by a camera. Experimental results showed that the thickness of the triangular liquid film ranged 0.98—9.37μm, and the thickness of the rectangular liquid film ranged 0.1—13μm. Under the influence of gravity, the thickness of the liquid film gradually increased from top to bottom, and the thickness of the liquid film was uniformly distributed in the horizontal direction. With the passage of time, the overall thickness of the liquid film decreased gradually due to gravity drainage. The thickness of the weakest point at the top reached the minimum value of 0.08μm before the overall rupture of the rectangular liquid film. Further analysis of the rectangular liquid film reveals that the maximum volume of the film was 2.66mm³ and the maximum volumetric flow rate was 0.28mm³/s throughout the drainage process. In addition, the visualization of the surface flow field of the liquid film could be realized by the distribution change of the interference fringes, which provided a new research method for the study of the microscopic surface flow field of the liquid film.

Key words: lateral shearing interferometry, liquid film thickness, drainage, two-phase flow, optical measurement

中图分类号:

TK31

盛稳, 余波, 郭晗, 周怀春. 基于横向剪切干涉系统的液膜厚度分布检测[J]. 化工进展, 2024, 43(2): 743-751.

SHENG Wen, YU Bo, GUO Han, ZHOU Huaichun. Liquid film thickness distribution detection based on transverse shear interferometry system[J]. Chemical Industry and Engineering Progress, 2024, 43(2): 743-751.

图/表 12

图1 液膜拉伸装置示意图

图2 横向剪切干涉系统示意图

图3 平面液膜及其干涉条纹图

图4 干涉条纹分布还原

图5 干涉暗纹拟合

表1 系数矩阵计算

因式项	系数	因式项	系数
x³	3.2×10^-9	xy	-4.5×10^-5
x²y	3.2×10^-8	y²	-1.3×10^-9
xy²	-5.0×10^-9	x	1.7×10^-2
y³	-5.0×10^-8	y	3.0×10^-2
x²	-5.6×10^-5	c	2.8

图6 条纹级数与三角形液膜厚度分布

图7 矩形液膜厚度分布与干涉图像

图8 不同时刻三角形液膜厚度分布

图9 矩形液膜不同位置点厚度随时间的变化

图10 液膜破裂前连续两帧图像

图11 排液过程中液膜体积分布变化

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