External Gear Pump - Cavitation

External Gear Pump - Cavitation

Conditions:
- n = 500 RPM,
- T = 23°C
- pout = 5,5 bar,
- pin = -0.3 bar

[aniksamiurrahman]

My goodness! Its so simple, yet I never thought that there will be cavitation during gear action.

[MayaUndefined]

this is the official occult mechanicus screen saver

[tomconnors]

Took some time but the algorithm finally pumped it out to us.

[samheasmanwhite]

Fascinating, you can see the cavitation on the upper side starting earlier since there is leakage to the next cavity on the bottom, an asymmetry since it is the upper gear that is being driven.

[sky]

Well this is the coolest video I'll probably watch all day. Who knew this would be happening within the pump. As someone who is now machining gears out of my home hobby shop, I never would have thought of this. Great video and thanks for sharing.

[Lowrider]

I had pump gears in my hands with many many tiny grooves in it. These where from aircraft pumps that have pretty high rpms. They explained what cavitation is, but with this kind of video it would be much easier to understand.

[gordonu]

als Feinmechaniker muss ich sagen einfach nur schön. Danke!

[sixstringedthing]

Amazing to see the clearly visible localised shockwaves being generated as each little vortex collapses.
Awesome footage, like/sub from me!

[FIREMANDRE]

This!…. Is a good example of accelerated wear on mechanical gears. Fluid viscosity also has a major role in this too. This is a very good video capture!

[russellking]

Interesting to note that the vortices (after the vaccuum collapses) is sucked into the next void - denser material tends to be drawn into vortices, suggesting that metal chips from erosion will be kept within the vortices somewhat instead of travelling downstream (I think you can see metal flakes around the vortices in this video). I suspect purging the first bit of fluid just before startup should reduce fowling due to this (or a magnet on the outer wall near the vortices to draw metal fragments out before they get a chance to flow downstream). this is great footage though, lots to learn!

[PavloLukashuk]

Неймовірно, чудово видно, як пузирі кавитації після розширення ! 👍 Дякую чудовий контент ! 😎

[raceace]

Never even considered this as occurrence, but I guess this would generally be a negative in terms of reduced longevity and noise.

[rbaxter]

Now THAT is somming every mech engr needs to see. The talk and prevention always deals with centrifugal, but here is an effect that extends the 'textbook' to show how the theory is applicable IF you actually understand that theory.
Imagine a test question or bonus points for such a condition!

[TheDeepDiveLLC]

This actually makes more sense why we need oil on our gears and between moving parts. I knew this happened, but didn't understand it the way it was shown. Thanks for enlightening me today.

[andresmonagas]

I love this video, so mesmerizing. So much so that I wanted to have it as a wallpaper.

[michaelm]

Notice how fast the cavitation swirls and collapses occur in slow motion, probably at 1/1000 speed or less.

[__shifty]

fun fact, the gears look like they're pushing liquid from the right to the left of the screen, but the fluid actually follows the teeth around the outside of the gears. so the direction of fluid flow is actually left to right in this type of pump

[АндрейКруговой-эс]

Никогда бы не подумал, но это идеальные условия для создания кавитации! Прямозубые мало где применяются! Да на скоростях!

[andreasduzariev]

Получается, что износ внутренней стороны зуба, которая не прилагает усилие на ведомую шестерню, происходит не в результате загрязнения, а в результате длительной кавитации! Офигенно, никогда об этом не задумывался.

[simulitica]

Amazing resolution, beautiful footage. Who else here is working on cavitation in CFD?