Why pump cavitation occurs?

First, the causes of cavitation

Cavitation is caused by the liquid vaporization, the liquid molecules escape the liquid surface, a process of gas molecules, known as "vaporization." The degree of vaporization of liquid pressure and the size of the high and low temperature. Dissolved in the liquid gas, pressure and temperature changes will be released, the formation of cavitation. When the internal pressure of the liquid drops below the saturated vapor pressure of the liquid at the temperature, bubbles or cavitation are formed in the local area. When the pressure rises, the bubble is suddenly crushed by the pressure around it, Extruded to the center of the bubble at an extremely high rate, causing a hydraulic shock to the equipment. The entire process of microbubble generation, rupture and physical and chemical effects on the overcurrent surface is called cavitation.

If the liquid does not contain any impurities, cavitation does not occur even under low pressure. Foreign cavitation researchers believe that the tensile strength of ultra-pure water (ie, the limit for generating holes) far exceeds the tensile strength of conventional metal materials. However, the usual liquid always contains gas or solid, these impurities become corrosive nuclei, under certain conditions to induce the occurrence of holes. Due to the different proportion of water and sand, the movement path of sand and streamline may speed up the occurrence of cavitation.