What is the working principle of watering can?

The structure diagram of watering can principle (hair watering can) is as follows:

In very dry conditions, it is best to spray the watering can in the air to increase the humidity of the air (tap water can be bottled by spraying), and its principle is Bernoulli principle.

Bernoulli's principle says that in fluid, the flow velocity is large and the pressure is small; Small flow and high pressure. The fluid will automatically flow from high pressure to low pressure. When passing through the trident, the low-speed water flows to the high-speed air.

Water is torn into small drops by high-speed air (imagine that the water flowing out of the faucet is slow at first, and it is a water column; But then the speed gradually accelerated and became a drop by drop. These small water droplets turn into fog when they are ejected.

Extended data:

The content of Bernoulli's principle:

This is the basic principle adopted by hydraulics before the establishment of the theoretical equation of fluid mechanics continuum, and its essence is the conservation of fluid mechanical energy. Namely: kinetic energy+gravitational potential energy+pressure potential energy = constant. Its most famous inference is that when the flow rate is constant, the pressure will be low when the flow rate is high.

Bernoulli principle is often expressed as p+ 1/2ρv2+ρgh=C, which is called Bernoulli equation. Where p is the pressure at a point in the fluid, v is the velocity of the fluid at that point, ρ is the density of the fluid, g is the acceleration of gravity, h is the height of the point, and c is a constant. It can also be expressed as p1+1/2ρ V12+ρ GH1= P2+1/2ρ V22+ρ GH2.

It should be noted that Bernoulli equation is derived from the conservation of mechanical energy, so it is only applicable to ideal fluids with negligible viscosity and incompressibility.

References:

Baidu Encyclopedia-Bernoulli Principle