The phenomenon of spray is that the liquid disperses and collides with the surrounding air to form discontinuous water droplets. One of them is liquid, including liquid and gas. Human production and life cannot be separated from body fluids. The most common liquid is water, and the most common gas is air. Man must be free of water and air every minute and second. Therefore, the utilization of water and air has been studied scientifically. In today's urban life, in addition to paying attention to environmental quality and quality of life, spray research has also brought a lot of progress and results.<br>2.2.2 structure of sprayer<br>Generally speaking, the mechanical structure of liquid machinery includes liquid sprayer. Fluid machinery is one of the earliest machines manufactured by human beings and one of the most widely used machines at present. This is because people and the surrounding fluid are mainly mechanically connected by fluid. With the expansion of human life and production, with the continuous development of fluid machinery, there will be many new fluids. (as shown in Figure 2-2)<br>Figure 2-2<br>Basic structure of sprayer 2.3<br>Operation principle of ultrasonic atomizer 2.3.1 principle of ultrasonic atomizer<br>2.3.1.1 function of ultrasonic wave in water sprayer<br>(1) Mechanical action. The particles in the medium vibrate in the ultrasonic propagation in the medium. The inside of the liquid causes huge hydraulic impact, which destroys the force between the liquid molecules.<br>(2) Thermal effect. High frequency and high energy When it passes through the media, it will cause strong friction between molecules, convert sound energy into heat energy, produce thermal effect, and provide energy to destroy the force between molecules.<br>(3) Chemical action. Ultrasound can induce or accelerate specific chemical reactions. For example, water dissolved in nitrogen is treated with ultrasound to produce nitrous acid. As shown above, when the ultrasonic wave propagates to the liquid, the combined effect of these effects will cause a lot of water holes to the liquid, while destroying part of the force and dispersing the liquid. It can be changed.<br>(4) Sound cavity. When the ultrasonic wave propagates in the liquid, the liquid particles vibrate strongly under the specific sound intensity, and there will be many small bubbles in the liquid. The bubble increases rapidly until it breaks and merges with the negative pressure vibration. In this process, the liquid particles play a fierce interaction, and the liquid temperature suddenly increases, which plays a good role in the mixing of silver, making the two unsuitable liquids such as oil and water sulfurize, accelerating the chemical reaction, and accelerating the speed of control. The various effects of using ultrasound in liquids are called ultrasonic cavities.<br>2.3.1.2 ultrasonic spray technology<br>
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