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The fog is actually a droplet of water. There are four types of existing sprayers.
One uses Bernoulli's principle. Bernoulli's principle says that in the same fluid, the flow rate is large, but the pressure is small; the flow rate is small, and the pressure is strong. The fluid will automatically flow from high pressure to low pressure. When passing through the trigeminal pipe (the specific picture cannot be drawn, I understand it by myself), the low-speed flowing water flows to the high-speed flowing air. The water is torn into droplets by the high-speed air (Imagine that the water flowing out of the faucet has a slow speed at first, which is a column of water; but then the speed gradually increases and becomes drop by drop). These small water droplets become fog after spraying out.
The second method is to press water into a thin tube to cause a high-speed water flow. The high-speed water flow breaks into small water droplets when it hits an obstacle. The situation is like blocking the faucet with your finger. Household sprayers often use this structure, and the cost is low.
The third is to charge the water (water is a dielectric), and use the same kind of charge to repel each other to divide the water into droplets. The droplet particles in this method are very small. The same principle is used to paint cars.
The fourth type is ultrasonic atomization. Vibration can cause "sprays" on the water surface. The vibration frequency of ultrasonic waves is very high, so the wavelength of its "waves" is very small, so its "sprays"-small water droplets are also very small, and these small water droplets become fog. The throat spray machine used to treat respiratory diseases in the hospital uses ultrasonic atomization.
