Cavitation is a hydrodynamic phenomenon that involves the formation of steam bubbles within a fluid in motion, as a result of a large increase in its speed and the pressure drop that this entails, assuming that energy is conserved (Bernoulli’s theorem). It is precisely when the pressure drop is so large, that leads the fluid up to its steam pressure, when the gas bubbles, also called cavities, appear.
Once formed, the bubbles travel to higher pressure areas and implode (return suddenly to a liquid state abruptly), producing a trail of gas and an abrasive attack to the surface where the fluid travels, which sometimes can lead to faults in the material.
Armfield cavitation equipment shows the phenomenon in a visual and auditory fashion. This also makes possible its mathematical validation.
Here is a video that shows the operation of a demonstration equipment of cavitation F1-28 Armfield. This equipment works coupled to the hydraulic bench F1-10 and allows the observation of the cavitation phenomenon, the comparison between theoretical pressure and real pressure under conditions of cavitation (by reducing the fluid pressure up to its steam pressure at working temperature), the observation of the air release because of the existence of free gas dissolved in a liquid and the reduction of cavitation by increasing the static pressure of a liquid.
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