Liquid film thickness distribution detection based on transverse shear interferometry system
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.
lateral shearing interferometryliquid film thicknessdrainagetwo-phase flowoptical measurement
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