We all know that in the slowly open the faucet, the water is obviously slow, and then slowly all the faucet flail gnome gypsum pork chulan open, the water flow faster and faster, more and more, But we have played such a game, the faucet by the water pipe, pinch the other end of the water pipe, let go of a small mouth, the speed is not very fast, the solution is also a small export, why the difference between before and after so big? More
In the water pipe, the faucet is very small, the pressure is very large, the flow rate is very small, in the open water pipe to open a small mouth, pressure is equal to atmospheric pressure, pressure is very small flow rate is very large. This is determined by the fluid Bernoulli equation, the equation can be simplified as p + kv ^ 2 = constant, the tube can produce a lot of pressure, the speed of the faucet back you saw off, the valve exposed, You will see the same hand with you, this is the pressure reduced to atmospheric pressure, the flow rate increases
Pinch the other end of the water pipe, let go of a small mouth, the speed is very fast, and then you use a towel to cover a small exit, the water slowly down the towel. This is related to the leading structure. Faucet valve in the middle, and no direct external water, but sprayed on the faucet outside a tube on the wall, and then pooled into a bunch, because the flow is not large, the faucet is relatively thick, so it will slowly shed. If you have the edge of the leading edge saw off, the valve exposed, will see you with the hand pinch is the same phenomenon.
Faucet outlet inside the core to play the role of control of water flow and limit the flow of water at the same time have a bubble effect, so the outlet core is also called "bubbler", different structural effects are different.
Ask well! water pressure before the leader and the water pressure in the water pipe is the same, the water speed even so much difference! Water in the water pipe is through the small slit "straight" rushed out, no other additional resistance. When the faucet is very small, the water is also through the small slit out of the flow, but that small seam is "horizontal", the water at least around the second bend, which brings a considerable resistance around the bend, so the water slow down , And even a drop of the.
