Experimental design of gas-liquid two-phase flow pattern analysis based on high-speed camera technology
[Objective]In view of the traditional experimental teaching of fluid mechanics,it is difficult to observe the dynamic process of fluid movement.Thus,students possess a lack of intuitive understanding of fluid phenomena.The concept of fluid mechanics is known for its strong theories and abstract concepts,and thus,the course structure can be adjusted to stimulate students'curiosity for analyzing and problem-solving,build experimental teaching devices,and enhance students'analytical and problem-solving abilities.[Methods]In a gas-liquid two-phase flow,understanding the kinetic behavior of bubbles in the cyclone is highly significant for the experimental teaching of fluid mechanics.Thus,this paper combines high-speed camera technology and the traditional experimental teaching platform to ensure that students can more intuitively observe the bubble in the cyclone bubble aggregation and crushing characteristics of the phenomenon,in addition to the bubble crushing aggregation behavior analysis.[Results]By integrating a high-speed camera inside a gas-liquid cyclone,it can be observed that the gas-liquid two-phase of different media forms a strong cyclone field due to the centrifugal force inside the cyclone.Furthermore,the centrifugal force varies significantly,and thus,the bubbles continue to converge in the direction of the axis,resulting in the formation of a gas column in the center of the axis.In the process of convergence,bubbles continue to collide with each other.The contact extrusion results in the discharge of water from the extruded gap,the liquid film rupture and fusion,and bubble aggregation.Subsequently,a new bubble is formed.The bubble cluster is subjected to shear force,the surface of the depression,and outward liquid discharge until it breaks into multiple bubbles.Under the impact of the cyclonic field,the bubbles exhibit different flow patterns:bubble flow,drop flow,annular flow,filamentary flow,and air mass flow.[Conclusions]The experimental teaching analysis of the bubble and its broken aggregation behavior of the study deepens students'understanding of the experimental theory of fluid dynamics,providing a platform to explore the laws of fluid dynamics.This platform is simple to operate and can help observe the movement of bubbles in the flow field,and it caters to the student's respective needs to design programs and test means.The experimental process can provide a more comprehensive understanding of high-speed camera technology in the experimental theory of fluid mechanics and the connotation of knowledge to address the issues in terms of the quality of traditional teaching.In addition to enhancing students'interest in learning and hands-on practical enthusiasm,it broadens students'vision and thinking,enhances students'participation in the experiment,promotes students'understanding of the contents of the discipline of fluid mechanics,and enhances students'analytical and problem-solving abilities.Altogether,it comprehensively enhances experimental teaching.
high-speed camerabubbleaggregation and breakagegas-liquid two-phase flowexperimental teaching
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