Using the principle of back sprayers

The fog is actually water droplet. The existing back sprayers has four. A is the Bernoulli principle. The principle of Bernoulli said in the same liquid, high velocity, low pressure; back sprayers  of small, high pressure. The fluid will automatically flow from the high pressure low pressure. When in through a three-way tube (specific diagrams can be drawn, yourself), back sprayers low speed flow to the high speed of the flow of air. The water is of high speed air to tear into droplets of a droplet (ideas out of the water, the tap water was just beginning to slow, gradually backpack pressure sprayer  the speed of; but later becomes a drop of a drop). These small water droplets sprayed out after a fog. The second use is put water into the tubule caused by high velocity flow, high velocity flow obstacles after splitting into small drops of water. As the tap after rolling make big fingers blocked. Home of the back sprayers use this structure, low cost. The third is to make water (water is the charge on the dielectric), the water into droplets repel each other by the same charge. This method is very small droplet. The same principle is also used to give the car paint. The fourth kind is ultrasonic backpack garden sprayer . Back sprayers vibration can cause "waves" in the water, the ultrasonic vibration frequency is very high, so it's "wave" of the wavelength is very small, so its "spray" -- the small droplets are very small, these small water droplets into the mist. The hospital throat spray machine for treating respiratory disease is the use of ultrasonic atomization.