Research On Multi-angle Dynamic Contact Behavior Between Dust Removal Droplets And Dust Surface

Spray dust removal technology is a widely used dust prevention and control method.The contact behavior of dust and mist is also a solid-liquid contact behavior in essence,and its dust removal efficiency is closely related to the contact behavior between dust and droplets.Therefore,it is of great significance to study the contact behavior of spray dust droplets and the surface of fine dust for understanding the principle of solid-liquid contact wetting and perfecting the theory of solid-liquid collision in the field of dust prevention and control.In this paper,the method of combining theoretical research and experimental research is used to study the behavior of droplets and dust surfaces when they are affected by different factors,and propose a calculation method for the energy loss of droplets during the contact process.The main research contents include:The phenomena observed in the experiment were statistically analyzed and classified,and the behavior types of droplets in contact with the dust surface were divided into four categories:direct spreading behavior,retracting behavior,bouncing behavior and rolling behavior.Among them,the retraction behavior is divided into two types without rolling trend,the bouncing behavior is divided into four types with or without rolling tendency,primary and secondary bounce behavior,and the rolling behavior is divided into three types:no bounce,primary bounce,and secondary bounce behavior.The effects of droplet velocity,droplet surface tension,particle size distribution on the dust surface,and the contact angle between the droplet and the dust surface on the contact behavior were investigated experimentally,and the contact behavior type,spreading time,spreading area,and maximum bounce height were used as their characterizations.The study found that the influence of droplet velocity on the contact behavior is mainly manifested in that the droplet velocity directly affects the initial energy of the droplet.Different initial energy will lead to different residual energy of the droplet after the contact behavior occurs,which also leads to the generation of different contact behaviors;the influence of droplet surface tension on contact behavior is mainly manifested in that surface tension is the main driving force for the droplet retraction behavior,which is directly related to whether the droplet can successfully complete the retraction behavior or even the subsequent bouncing and rolling behaviors.The influence of particle size distribution on the dust surface on the contact behavior is mainly manifested in that the particle size distribution affects the smoothness of the dust surface,and the spreading performance of the droplets on the surface will be different.The influence of the contact angle on the contact behavior is mainly manifested in that when the dust surface has an inclination angle,the retraction time of the droplet on the inclined surface will be shortened,and when the inclination angle reaches a certain level,the droplet will roll on the surface.The energy loss of the droplet in the whole dynamic process and its calculation method are studied through energy analysis,and the law of energy loss is studied and verified based on the experimental data.The results show that the droplet bouncing behavior cannot be produced if W_fis less than 1.84×10^-4J due to various energy dissipation and resistance caused by the droplet contact with the dust surface and the droplet energy loss except the compression surface energy loss;W_fis in the range of[1.84×10^-4J,7.07×10^-4J],the bouncing behavior may occur;W_fis greater than 7.07×10^-4J,the bouncing behavior can occur.If the W_fis less than1.83×10^-4J,the droplet rolling behavior cannot be produced;if the W_fis in the range of[1.83×10^-4J,7.06×10^-4J],the rolling behavior may occur;if the W_fis greater than 7.06×10^-4J,the rolling behavior can be produced scrolling behavior.