Thermosyphon effect

What is the Thermosyphon effect ?

The siphon phenomenon is caused by the difference between the liquid molecules' gravitational force and the potential energy, that is, the water column pressure difference is used to make the water rise and then flow to a low position. Since the water surface of the nozzle is subjected to different atmospheric pressures, the water will flow from the pressure side to the pressure side until the atmospheric pressure on both sides is equal, and the water surface in the container becomes the same height, and the water stops flowing. The water in the container can be quickly withdrawn by the phenomenon of red suction. The siphon is an ancient invention of mankind. In the 1st century BC, a strange siphon was created.

In fact, siphoning is not entirely caused by atmospheric pressure, and siphoning can also occur in a vacuum. The force that causes the liquid to rise is the cohesion of the molecules between the liquids. In the case of siphoning, since the liquid flowing out of the tube is more than the liquid flowing into the tube, the gravity on both sides is unbalanced, so the liquid continues to flow in one direction. As the liquid flows into the tube, the pressure is higher as it goes up. If the tube in which the liquid rises is high, the pressure is reduced to cause bubbles in the tube (composed of air or other constituent gases), and the height of the siphon is determined by the generation of bubbles. Since the bubble breaks the liquid, the force between the gas molecules at both ends of the bubble is reduced to zero, thereby damaging the siphoning action, so the tube must be filled with water. At normal atmospheric pressure, the siphon acts better than in vacuum because the atmospheric pressure on the nozzles on both sides increases the pressure inside the entire siphon.
The thermal cycling motion is called the thermosiphon effect. The greater the temperature difference between the collector and the heat exchanger, the faster the circulation of water between the two.