【Q&A】August 5, 2017
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What is cavitation? Answer: When the pressure at the impeller of a centrifugal pump is lower than the saturated vapor pressure of the liquid, the liquid begins to vaporize, resulting in the formation of numerous bubbles. When the bubbles enter the high-pressure area along with the fluid, they rapidly condense and burst under the influence of the high-pressure liquid. At this point, the fluid rushes into the space previously occupied by the bubble at an extremely high velocity, creating a localized hydraulic shock. The impact pressure of the liquid is high and occurs frequently, causing spots, cracks to form on the surface of the impeller, eventually leading to a honeycomb-like or sponge-like structure. At the same time, it causes vibrations in the pump, deteriorating its performance. Flow rate, head, and efficiency drop suddenly. This phenomenon of vaporization, condensation, and impingement is called cavitation. http://down.hcbbs.cc/attachment/forum/201706/10/203353z7y06fdo70r6eod0.jpg “My Technical Upgrades in the Coal Chemical Industry” in 2017 http://bbs.hcbbs.com/thread-1786290-1-1.html (Source: Haichuan Chemical Industry Forum) Event on Registered Chemical Engineers – Sharing of Experiences: “Learning from Others’ Experience” http://bbs.hcbbs.com/thread-1808158-1-1.html (Source: Haichuan Chemical Industry Forum)
When the pressure at the impeller of a centrifugal pump is lower than the saturation vapor pressure of the liquid, the liquid begins to vaporize, producing a large number of bubbles. When the bubbles enter the high-pressure area along with the fluid, they rapidly condense and burst under the influence of the high-pressure liquid. At this point, the fluid rushes into the space previously occupied by the bubble at an extremely high velocity, creating a localized hydraulic shock.
When the pressure at the inlet of the impeller is lower than the saturation pressure of the working medium, part of the liquid will evaporate (i.e., vaporize). After evaporation, when bubbles enter areas with higher pressure, they condense suddenly due to the pressure, and the liquid surrounding them flows in to fill that space, resulting in a hydraulic shock; this phenomenon is known as cavitation.
When the pressure at the impeller of a centrifugal pump is lower than the saturation vapor pressure of the liquid, the liquid begins to vaporize, producing a large number of bubbles. When the bubbles enter the high-pressure area along with the fluid, they rapidly condense and burst under the influence of the high-pressure liquid. At this point, the fluid rushes into the space previously occupied by the bubble at an extremely high velocity, creating a localized hydraulic shock.
Cavitation occurs when the installation height of a centrifugal pump increases, which leads to a decrease in pressure inside the pump. The lowest point of pressure within the pump is usually located slightly downstream of the inlet to the impeller blades; liquid rushes towards the center of these bubbles at high speeds, resulting in high-frequency, intense pressure fluctuations. This phenomenon is known as cavitation
When the pressure at the impeller of a centrifugal pump is lower than the saturation vapor pressure of the liquid, the liquid begins to vaporize, producing a large number of bubbles. When the bubbles enter the high-pressure area along with the fluid, they rapidly condense and burst under the influence of the high-pressure liquid. At this point, the fluid rushes into the space previously occupied by the bubble at an extremely high velocity, creating a localized hydraulic shock. The impact pressure of the liquid is high and occurs frequently, causing spots, cracks to form on the surface of the impeller, eventually leading to a honeycomb-like or sponge-like structure. At the same time, it causes vibrations in the pump, deteriorating its performance. Flow rate, head, and efficiency drop suddenly. This phenomenon of vaporization, condensation, and impingement is called cavitation.
When the pressure at the impeller of a centrifugal pump is lower than the saturation vapor pressure of the liquid, the liquid begins to vaporize, producing a large number of bubbles. When the bubbles enter the high-pressure area along with the fluid, they rapidly condense and burst under the influence of the high-pressure liquid. At this point, the fluid rushes into the space previously occupied by the bubble at an extremely high velocity, creating a localized hydraulic shock. The impact pressure of the liquid is high and occurs frequently, causing spots, cracks to form on the surface of the impeller, eventually leading to a honeycomb-like or sponge-like structure. At the same time, it causes vibrations in the pump, deteriorating its performance. Flow rate, head, and efficiency drop suddenly. This phenomenon of vaporization, condensation, and impingement is called cavitation.
When the pressure at the impeller of a centrifugal pump is lower than the saturation vapor pressure of the liquid, the liquid begins to vaporize, producing a large number of bubbles. When the bubbles enter the high-pressure area along with the fluid, they rapidly condense and burst under the influence of the high-pressure liquid. At this point, the fluid rushes into the space previously occupied by the bubble at an extremely high velocity, creating a localized hydraulic shock.
Cavitation refers to the phenomenon that as the installation height of a centrifugal pump increases, the pressure inside the pump decreases. The lowest point of pressure within the pump is usually located slightly downstream of the inlet of the impeller blades; liquid rushes toward the center of the bubbles at high speeds, resulting in high-frequency, intense pressure fluctuations. This phenomenon is known as cavitation.
It refers to the fact that when the installation height of a centrifugal pump is increased, the pressure inside the pump decreases. The lowest point of pressure within the pump is usually located slightly downstream of the inlet of the impeller blades; liquid rushes toward the center of the bubble at high speed, resulting in impacts with very high frequency and intense instantaneous pressures