Cavitation of Fluorine-lined pump

In the flow rate of the fluorine-lined pump, bubbles appear when the liquid pressure drops below or below the corresponding vaporization pressure at the liquid temperature. Bubbles are mainly steam, but because a certain amount of gas is dissolved in the water, there is less gas in addition to the bubbles in the steam.

When water flows into the high-pressure area, the water vapor condenses into water, and the bubbles gradually deform and break. In the wall near the bubble burst, the impact is very strong, can reach hundreds of atmospheric pressure, or even thousands of atmospheric pressure, so that the material of the runner is damaged. The process by which bubbles form until they collapse and burst, resulting in material erosion called cavitation. The cavitation phenomenon of fluorine-lined pump, bubbles are also known as cavitations, which gather in the air bubble group, which is called cavitation or cavitation.

Although it is similar to boiling, it is actually two different concepts.

First of all, although these two will form bubbles, boiling is due to a rise in temperature, and cavitation is due to a drop in pressure. Therefore, boiling is a thermodynamic phenomenon and cavitation is a hydrodynamic phenomenon.

Secondly, the cavitation phenomenon includes the formation and growth of bubbles until the collapse of the whole process, while the boiling phenomenon of bubbles is increasing, and there is no similar cavitation collapse process in the boiling process, even though the bubble may burst through the surface, but the total volume of steam continues to increase.

The actual lift refers to the vertical height of the water from the water to the surface of the pool, which can be measured with a ruler. If the outlet is not submerged under the pool, the actual head is the vertical height of the inlet to the center of the outlet. Sometimes the actual lift and the actual head can be measured separately, and the actual lift can be obtained by adding two. When measuring, do not regard the tilt height as the vertical height.

When measuring the suction position in the well, change the position of the suction surface. When the fluorine-lined pump is not pumped, the water is called the static water level. When pumped with fluoride, the surface of the water will drop, to a certain extent, no longer fall, the water is called the water level. When measuring the actual head or actual suction head, the dynamic water level should be used, not the static water level.

What's the difference between water level and water level? It is related to the water quality in the well, the flow rate of the fluorine pump, the early stage or the rainy season. Therefore, the determination of dynamic water level should be determined by locating local hydrological information or referring to adjacent wells.

The loss head consists of two parts, one is the loss caused by liquid flow and wall friction, which is called straight pipe friction resistance loss (or loss process), and the other is the loss caused by obstacles such as bottom valve, valve, elbow and other obstacles to the movement of liquid, called local resistance loss.