How powerful is the bubble?

Can you believe it? A tiny bubble, with infinite power, can even dent metal and destroy ship propellers. Why is this? How can we resist the power of this little bubble?

We've all heard that song by G.E.M. Beautiful foam, although a flash, but this small foam, but can cause great damage. The moment the bubble burst will release a super shock wave, forming a terrible cavitation phenomenon, destroy the metal surface and let the parts are eroded.

At this point you might ask, what is cavitation? Here, we can understand it as the erosion effect of gas, which is the damage phenomenon on the solid surface when the solid surface and the fluid are in relative motion. The relative motion of solid surface and fluid will produce a special phenomenon, cavitation 39bet-kết quả bóng đá-kết quả xổ số miền bắc-kèo bóng đá -soi cầu bóng đá-đặt cược.

To put it bluntly, it forms bubbles. The formation of a bubble is caused by the local pressure reduction in the liquid. The bubble is constantly flowing, and when it reaches the place where the liquid pressure is higher than the bubble pressure, it will burst instantly. ​And in the process of destruction, it's not ordinary. We do not think that as we usually blow bubbles, cavitation bubbles will form a strong shock wave when they burst, also known as high-speed micro torrent, which can carry out a strong impact on the surface of the object. In addition to that,​ It will distort the grain on the metal surface, form corrosion current, and corrode the metal material, which is the basic process of cavitation.

db84314dd897dcc45092e527a1764355Here we put the simplified, the principle of the cavitation is actually very complicated, involving fluid dynamics and the function of the mechanical shock and so on, including liquid electrochemical interactions, how about the cavitation damage, a total blast mechanism, thermal effect mechanism, the electrochemical mechanism and so on different points of view.

The phenomenon was first discovered on a British ship in 1902. The explanation at the time was corrosion from the sea. With the development of technology, people found that this phenomenon is not only so simple, the force process is extremely complex, generally appears in ship propellers, as well as water pumps and turbines and so on. In the beginning, because of the effect of cavitation, and there is a small pit, we might as well be called the small pitting. After these small pits are growing into another cave, the material loss. Thus, this phenomenon is not beneficial, especially for the pump and flow components, the equivalent of poison. If we don't do something about it, we'll end up with broken parts.

Here friends may want to ask, so for this phenomenon, how do we solve it? First of all, this phenomenon is unavoidable. We can only artificially improve the hardness and dielectric corrosion resistance of the material to resist cavitation, now the most commonly used method is to attach a coating on the surface of the material, through the coating to resist cavitation, to protect our parts.

In this field, China has developed resin toughened ceramic cavitation resistant coating, which greatly improves the ability of the object to resist cavitation. At present, the common practice of polymer ceramic wear-resistant coating on the market is divided into two parts. One is high-performance wear-resistant particles, and the most commonly used are ceramic particles. The other is modified toughened heat resistant resin. The composite integration of the two is our polymerized ceramic wear-resistant coating, which can not only repair equipment wear caused by cavitation, but also be used for advance protection against cavitation.

So this gives you an idea of why bubbles wear metal and how to protect it? No one can imagine such a small bubble, actually has such a large killing power, but our technology is continuous progress. I believe that with the continuous development of our technology, for cavitation phenomenon, we will one day be able to completely overcome it.

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