Cavitation: Ways Of Avoiding

The ways to avoid the phenomenon of cavitation is given by a sudden drop in fluid pressure below the vapor pressure. this is due to sudden changes in flow velocity or a partial vacuum effect generally given by large columns of fluid such as pumps. In practical terms this pressure drop causes the formation of vapor bubbles, which travel through the fluid to that in another place, the pressure is restored causing a sudden gas condensate, generating an implosion, is given a strong impact, in adjacent areas as it creates the so-called hollow charge effect or Monroe, where all waves converge to the same location confining themselves, this creates very significant bites end up destroying the metal. It is also known that these gas bubbles are sometimes not such, as we all know the fluids are incompressible, but due to special conditions of change in velocity, the fluid is torn momentarily creating a hole, which has no gas or has a very limited extent, when the speed immediately after regularized, fluid molecules plunge sharply into the hole that was generated, causing a shock at the point of convergence, the same that is directed to where there were no precipitating molecules, which is the wall nearest the surface. As is known elements, which suffer the greatest damage by this phenomenon are the propellers, pumps, fuel lines, hydroelectric generation turbines, rudders of ships, etc.. Although cavitation is a phenomenon commonly identified as necessary to avoid negative in its impact has basically two useful applications, cleaning by cavitation and ultrasound and called Super cavitating, which allows the movement of a body immersed in a fluid, to speeds exceeding 500 km / h even close to the speed of sound, is currently widely investigated for military purposes. Not very easy to avoid cavitation, and that can not be controlled in many cases the liquid medium for these cases what is done is to modify the geometry of the elements and / or make a careful design of the equipment involved. When you can control the flow, such as fuel pipe lines or water cooling, you can resort to some alternatives, such as decreasing the flow rate, keeping the fluid clean as possible, reduce the temperature of the or place dampers that absorb the velocity fluctuations Cavitation is usually detected by the noise which is similar causes snoring even pebbles moving it also generates vibration that is easily detectable especially since it can be seen in the graphs called humps camel cavitatorio clear sign of the phenomenon. Even slight cavitation, causes wear and that “clean” the surface of metal, oxide, which is a layer, exposing the protective metal, at that moment creates a stack.