I would like to ask about the relationship between cavitation and overheating in centrifugal pumps
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This post was last edited by laoying505 on 2010-7-9 14:44. I would like to ask the experts: can cavitation in a centrifugal pump cause the pump body to overheat? The person who can provide guidance should ideally indicate the source of the views or theoretical derivations presented, that is, the references. Thank you so much!
Reply to 1# laoying505: I’m not an expert, but the centrifugal pump experienced cavitation; it started to run idle, and the medium caused impacts on the impeller and volute, which definitely led to overheating of the pump
The pump outlet of a conventional centrifugal pump is usually at a slight negative pressure; there is no fluid flowing inside the pump casing, and a large amount of work is done within the pump, which leads to overheating of the pump. If it is in the south, the temperature is higher, causing the pump body to overheat; moreover, since the medium inside the pump tends to vaporize, cavitation may also occur. Therefore, cooling measures must be taken for the pump body.
Cavitation occurs when the pressure at the inlet of the pump impeller blades is lower than the saturated vapor pressure of the liquid at its operating temperature, causing the liquid to vaporize and form bubbles. When the external liquid pressure is higher than the vapor pressure inside these bubbles, the bubbles collapse, creating voids. Instantly, the surrounding liquid rushes towards these voids at extremely high speeds, leading to collisions between the liquids and a sudden increase in local pressure, which in turn causes fatigue in the metal surface. Heat is released when bubbles condense, and the local temperature can reach 200–300°C, which can lead to the formation of thermocouples that induce electrolysis and result in electrochemical corrosion of the metal. The textbook for the Chemical Engineering major, \"Fluid Process Machinery,\" includes information on this topic in the section on centrifugal pumps
You just need to install an automatic backflow valve at the pump’s outlet, and this problem will be resolved. Many projects use this device to eliminate the phenomenon you mentioned. If you have any questions, feel free to contact me at 15821637438 or leave your email address so we can discuss it in more detail*
In such cases, it is necessary to increase the back pressure to prevent vaporization of the liquid, which could cause pump cavitation
When a centrifugal pump experiences cavitation, the temperature of its pump casing definitely rises