Experimental study of the characteristics and stability of liquid film formed by impinging of water jets on a large vertical plate

This paper presents an experimental investigation of the liquid film resulting from jet impingement on a large-scale flat plate. A high-speed camera was used to capture direct footage of the liquid film, which was then analyzed using image processing techniques. The study focused on determining the thickness of the liquid film at various positions along the axial direction and examining the distribution and fluctuation characteristics of the falling liquid film under Reynolds number ranging from 4250 to 8500. Experiments were conducted at different angles of incidence to investigate the influence of the incidence angle on the thickness of the liquid film formed by the collision. The experimental results show that the development of liquid film thickness with increasing axial distance is divided into three stages. As the incident Reynolds number increases, both the average thickness and the degree of fluctuation of the liquid film increase, while the growth rate of the thickness decreases. Furthermore, it is evident that the surface of the liquid film will be disrupted during the flow process, and two modes of disruption have been distinguished.