The problem here is that the video stops. Absolutely beautiful footage.

@16willthompson65

5 ай бұрын

if you right click the video, loop is the first option ;)

@SirFloofy001

5 ай бұрын

@@16willthompson65 wait really? shiiiiit i was about to offer up an old website that does that. Learn something new every day

@milan9427

5 ай бұрын

​@@16willthompson65 not on phones unfortunatly

@wenesse1175

5 ай бұрын

​@@milan9427 loop on mobile: hit the settings wheel in the top right > additional settings > loop Enjoy

@cloud8521

4 ай бұрын

near perfect loop tho

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

@IstasPumaNevada

5 ай бұрын

Same!

@1NicholasWeir

5 ай бұрын

I'm blown away too! I also never considered the high pressure that could occur when they are meshing together.

@wdowa94

5 ай бұрын

There is cavitation even when you move your hand too fast ;)

@DreStyle

5 ай бұрын

That's why the oil needs cooling

@CFox.7

5 ай бұрын

@@1NicholasWeir cavitation is LOW pressure .. any high presure before this moment has nothing to do with it

this is the official occult mechanicus screen saver

Beautiful capture!

@4g3nt69

5 ай бұрын

respect cameraman for standing there

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

@sixstringedthing

5 ай бұрын

Take your Internet Cookie and get out.

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.

@LaggerSVK

5 ай бұрын

thats actually a very good catch. Just to further explain, different gear faces are in action (sealing) on top and bottom gear because of which gear is being driven.

@reversemyopia

5 ай бұрын

Amazing catch!!

@sixstringedthing

5 ай бұрын

Really nice catch. I just watched it for the third time and hadn't previously noticed the tiny gap between the leading faces vs. the closed gap between the trailing faces (which would be reversed if the lower gear was the driven one), and the way that the fluid flow through this gap causes the development of the upper vortex to "lead" the lower vortex by a tiny fraction of a second. Absolutely fascinating, cheers!

@RS-jq4oc

5 ай бұрын

by driven gear what do you mean? is the upper gear connected to the power source here or is it the lower gear? kindly excuse my lack of understanding

@samheasmanwhite

5 ай бұрын

@@RS-jq4oc Ye, it's the upper gear, it has to push the lower one around.

Beautiful Imagery.

@svenskfence3

5 ай бұрын

Love your stuff man, it inspired me to branch out on my own, and without better timing i'm building a 4,500lbs. CNC router to do my own work. Please keep us updated with controller configuration with the CNC controls.

@ShainAndrews

5 ай бұрын

Weird how this gets recommended to us soooo many years later. LOL.

@alanwatts8239

2 ай бұрын

It's just a pair of gears.

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.

@remkojerphanion4686

5 ай бұрын

Does cavitation cause real wear on the gears, or is it just insignificant marking of the surfaces?

@Lowrider2905

5 ай бұрын

@@remkojerphanion4686 these gears are hard chromed on the surface, and once this chrome is gone, it looks like a hole in the teeht, pinhole on the surface, and below this its getting larger. This can lead to a total fail once a chung breaks out of it. If you google "pump cavitation" you see crazy pictures.

@pootispiker2866

5 ай бұрын

​@@remkojerphanion4686Cavitation destroys metal in the surface little by little, so while it's not exactly "wear" it is damage that will eventually become terminal

@ChoChan776

5 ай бұрын

​@@pootispiker2866 to be fair you just perfectly described wear

@pootispiker2866

5 ай бұрын

@@ChoChan776 The term "wear" implies parts damaging other parts. On a larger scale this is catastrophic damage, while in something small like an oil pump it has basically no impact on the life of the pump.

als Feinmechaniker muss ich sagen einfach nur schön. Danke!

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

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

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.

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

@Maxumized

5 ай бұрын

Cool observation. You can see a shock wave from left to right as the gears mesh.

@nj1255

5 ай бұрын

@@Maxumized the lines/patterns you can see at the right side where the gears mesh together? That's not a shockwave. It's just the boundary between fast and slower moving liquid. On the left side, where the cavitation bubbles collapse, you can see quick flashes from dark to bright. Those are shockwaves. You can't really see the shockwave front propagate though, the video would have to be filmed at hundreds or thousands times higher framerate for you to be able to see that.

@Bleihagel

5 ай бұрын

oookay... i did not understand the left-to-right-thing yet, but i did a fast research so i think you are talking about this mechanism, right? kzread.info/dash/bejne/hoei1MySeJbNmKg.html

@bmx28kenilworth

5 ай бұрын

Wild

@Failure_Is_An_Option

5 ай бұрын

Losers open with "fun fact".

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!

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

@izzmus

5 ай бұрын

Someone once told me that the gears in this type of oil pump create half of the heat in the oil in an engine, and I can believe it. I wonder if some channels in the gears to allow flow would reduce cavitation more than they reduce oil flow.

@sixstringedthing

5 ай бұрын

@@izzmus All pumps work by creating a pressure differential between the inlet and the outlet, regardless of design. "Cross-flow" channels would reduce the pressure difference, and any modification which does that is going to reduce flow rate. I'm just an armchair enginerd, but I'm gonna guess that you would probably wind up in a situation where your pumps last twice as long due to reduced cavitation, but you'd need to put two of them in series to achieve the desired pressure/flow which is obviously going to leave you worse off in terms of overall efficiency of the system.

@RipeSnipe

5 ай бұрын

the design of the pump specifically pump curves over RPM is what makes this a non issue. this pump was ran outside of its parameters to cause cavitation

This insight is almost magical!

Amazingly detailed imagery!

That's pretty amazing to see.

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

Отличные съемки!

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

Quality content. Thanks for posting!

That's awesome to look at.

absolutely mesmerizing

Superb shot ! 👍

Its just insane, be able to see this

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.

@kisinroman

5 ай бұрын

Еще, если присмотреться внимательно, то видно, что очаги кавитации присутствуют именно на технологических неровностях самой шестерни. Чем выше культура производства детали, тем меньше износ получается.

Finally some quality content.

this is beautiful

Wow, amazing footage

This should be a looped wallpaper

Beautiful

I could look at this for hours

Mesmerizing

i needed this

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!

Nice footage

Cavitation causes more than annoying noise, it can actually wear the metal surprisingly fast. Ship propellers wear away due to cavitation, more so before they were engineered to minimize it.

while the video is for cavitation, it must also mean that there is hellish compression while the gears are meshing

@TransAmDrifter

5 ай бұрын

And the liquid acts also like a cushion, thus gains temperature. A damper to be exact.

@gunsite45

5 ай бұрын

That's what I'm thinking... and fluids are incompressible, so I'm guessing the sides of this are open to allow for the fluid displacement during the mesh? And the cavitation still happens because the low pressure is created before the fluid can fill back in fast enough? @TransAmDrifter, a gas would act as a cushion, but liquids would need a place to go as they don't compress

@bene5431

5 ай бұрын

​@@gunsite45It's an oilpump, so the sides are closed or it wouldn't produce any pressure

@Benoit-Pierre

5 ай бұрын

Helish compression is much less a problem than cavitation.

Amazing

That is so cool!

The little explosions.

@__shifty

5 ай бұрын

its more like an implosion. its not air bubbles. its technically space bubbles. its what happens when there is not enough fluid to fill the entire void and so it strings out. looks like air space in there, but its total vacuum. space space lol

Cool, I guess the upper gear was driving because the lower cavitation bubble started to "leak" into the upper cavity a little early.

Fascinating

Wow. That over time equals damage. Very beautiful.

@Failure_Is_An_Option

5 ай бұрын

Inconsequential for this application.

I get it! Because the top gear is the one which is pushing the bottom one, the contact point is always on the right side so the water can move through the tiny split on the left

gorgerous!

Всё нормально, кавитация разрывается! Живём!

It's worth noting that the fluid pumping occurs out of frame on the exterior part of the gear. The meshing area is not intended to move fluid but is instead powering the other shaft and preventing backflow from high(right side of frame) to low (left side).

And this is how the pump wear away, there just need for be a few particles as hard or harder than the gears for the cavitation to smash those particles on the gear and start digging in it.

@jimmystewert5217

5 ай бұрын

The damage is actually caused by the extremely high temperature of the bubbles that form.

a possible improvement to minimize root damage will be a smoother transition in the valley so the pressure relief wave front will not curl around the root.

@VKED23

5 ай бұрын

Exactly what I said

Notice how the spiraling of the collapsing vacuum alternates each and every time it's rotational direction. Goes back and forth spinning in opposite directions each time as it follows the new vacuum cavitation in expanse collapsing the old cavitation and it's newly becoming vacuum.

I see so much room for improvements!

@isaacibbotson4632

5 ай бұрын

At the same time, the gear rotor pump is unbeatable in simplicity. Lots of better pumps exist, but they're all more complicated and prone to failure than this little guy

@Failure_Is_An_Option

5 ай бұрын

You would be wrong... In fact you are wrong.

That's why you have channels at the side covers to mitigate cavitation.

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

@PiDsPagePrototypes

5 ай бұрын

Oil Pumps are usually Straight Teeth - the flow doesn't go between them, and straight teeth have a wider spacing between each tooth on a single gear, to carry that oil around the outside of them, between them and the housing. Helical gears would push sideways in to the housing, meaning they would need flat roller bearings, where the straight cut gets no sideways thrust, so the side of the gear can float on a thin layer of oil between the gear and the housing sides.

@tyrykmakto6682

5 ай бұрын

В маслонасосах такие условия, а они в каждой машине стоят.

No kidding! Pretty bad ass

Magnificent

Amazing, I wonder how fast those little vortexes are spinning?

This shit loops perfectly

Hail almighty Gear Pump

Really happy the algorithm brought me here.

I highly recommend looking up Uranium in cloud chamber, it's mesmerising like this.

quality content !

Wow. So cool.

I was hoping for the loop 😁

@alihms

5 ай бұрын

Put it in YT 1 minute format. With the correct starting and ending frames, it will feel like a continuous loop.

ВОООТ! Я же говорил, что это работает! ))

Hypnotisant 😵‍💫😴

The coolest part is that this doesn't kills the pump immediately. Cavitation incurs nasty shocks on the surfaces.

Man… I wonder how dope the first mechanics of Alexandria who thought of gears felt. Must have been like climbing 28 mountains at once. What a fascinating process that must have been.

very cool

it's hypnotic

Edging to this right now! 😍

Getting close to that tiny scale at which things don't appear to perform as they would in a larger setting. It's kind of fascinating.

Quite unusual to have a pump like this. The normal ones are Impeller, centrifugal or medical dosage pumps. The throughput of Liters/minute of one of these is very small I imagine, plus very noticable cavitation implosions in the video at the leading edge of each cogtip..😮😮

This is NOT all gear pumps. Because of the low teeth number count, the tooth foot has been enlarged so the opposite tooth head can fit, but in case of a gear pump it should be enlarged more to allow oil flow as soon as the next toth is in contact. You can see when the cavitation starts the next tooth is already in contact. Teeth correction reduce pump global flow a bit, but reduce oil squeeze (friction so power need, cavitation so ) by a lot.

HELL YEAH

We need small troughs hollowed out in the pump housing, through which the pumped liquid can flow freely into the spaces between the teeth where low pressure is generated. This will not reduce the efficiency or tightness of the pump, and will prevent cavitation. Perhaps the energy losses caused by it will also be reduced.

@ARoyalLyon

5 ай бұрын

I've seen such machined grooves in oil pumps, now thanks to this video I understand why.

For some reason I interpreted the title as a song title and thought I was about to hear the hardest drop of all time 😂

Important to know here is that in this case the fluid is pumped from left to right, not as you might think, from right to left.

I guess during normal operation you don't want that to happen as it will as I know quickly erode the gears and the pump casing and hydraulic pumps are in general very reliable what I know from all hydraulic machines I use at my work that just run and run. Does this happen during normal operation of gear/hydraulic pumps? I think of how devastating cavitation is to centrifugal pumps.

This should be on wikipedia

I don't know why I thought this was a song.

funny that in English this thing called "EXTERNAL gear pump", so you get a hint in what direction it pumps in ours its called just a gear pump

Even with the best oil, cavitation will still erode the metal at some point causing the gears to fail. Though its very very rare

Good

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

Left is the suction side and on the right side is the pressure side. Cavitation is in this case created by too much under pressure.

Sweeeeet 😎

If you could machine small channels perpendicular to the teeth allowing leakage would that help make the gear more efficient because then the backside of the teeth are pulling less vacuum?

I wonder if connecting the cavities would help anything. As one cavity is compressed the oil if forced into the expanding cavity.

it's like seeing a rotary engine

This why water pumps in engines fail, the cavitation destroys the gears that pump the coolant and eventually they fail. The mess they are in when they are removed you’d think they would use a harder metal but nope they are designed to fail eventually.

kurwa dobre

За этим можно очень долго наблюдать) Кавитация "пролезла" даже в зубчатую передачу) Обратите внимание - масло, хоть и почти несжимаемая жидкость, но вролне способная расширяться! С образованием пузырьков растворённых газов - каверн.

@1ksiman

3 ай бұрын

Масло не сжимается и не расширяется. Расширяется пространство им занимаемое

i used to calculate these Fers... this looks way cooler than to do that tho!

Can I get this as a desktop screen saver? :O)

Wonder if there’s a way to pass the fluid while ensuring it’s under constant volume

Интересно

So, this is a design flaw, right ? It should be designed in such a way that cavity volume remains constant. Without cavitation, this pump would lock, and the energy to create it is mostly lost.

That is where the energy gone