What is Cavitation? (with AvE) 

My disparaging remarks are taken out of context! I blame the clapped out Bridgeport.

cAvEtation? I have no idea what that means but loved the video.

Arduino versus Evil. That's like finding out Kramer's first name.

What an awesome surprise to see one of our favorite channels use our gauge!!! It looks like you could use a differential pressure gauge with a higher range. Would you want us to send out a free gauge with a 0-30PSI range? (we also have a 20 and 40)

I had no idea that AvE video i watch all that time ago was for you. Great colab guys.

Big thanks to AvE for the demonstration, and all the Patreon supporters making these videos possible. To learn more, visit www.patreon.com/PracticalEngineering

Grady: Proceeds to drawing with much time and care. AvE: "Look at that worthless sh* drawing".

Can't believe I am just finding this now. I love both these channels, but am surprised to see them together. They are both pretty clearly typical engineers, but from opposite ends of the sanity spectrum.

When Grady said this was an international collaboration between Canada and the United States I assumed he was the Canadian since he seems so polite and wholesome and AvE was American given his blunt sense of humour. Upon viewing Grady's profile and discovering he is from Texas I learnt a lesson about prejudice :P.

Worked as a throttleman on a submarine in the US Navy, we used venturi to draw vacuum in condensors. Also had to listen to hydrophones to make sure that we did not cavitate.

I love AVE been watching for years, why is RU-vid just now showing me this vid? You have an awesome channel too. Big fan!

You make fluid mechanics a practical and fun topic that invites you to watch your videos. The general opinion says that if someone took the time to prepare and share something special, it is up to the rest of us to offer the courtesy of seeing it, thank you for your generosity. ...

GentleMAAAANNZZ welcome back to the shop 👌👌 *edit - Mike Davison

Best RU-vid combo yet

You take criticism really well and the quality of your videos is always spectacular! Also thank you AvE for all the hard work!

This was a great watch. I've spent a lot of time around watercraft and had a basic understanding of how destructive and counterproductive cavitation can be. This gave me a much fuller understanding of it. Hats off to AvE for joining this, and I've also just subscribed to this channel as well. It will come in handy for becoming a self taught engineer! Tons of respect for all the RU-vidrs that devote their time to teaching others the ways of the enginerds and Jedi. Keep your stick on the ice.

Great video and explanation, but I thought that I should point out that most of the bubbles you are creating are from the dissolved gasses in the water. This is observed by watching the bubbles and how far they travel past the area of low pressure. If they were purely water vapor bubbles they would collapse much sooner. The dissolved gasses coming out of solution are what prevent a lot more damage from being done to equipment such as boat propellers, because they cushion the vapor bubble collapse. When you have a system such as a condensate pump where the air and noncondensable gasses have been removed, the vapor bubble collapse can be much more violent and destructive.

Two of my favorite channels together!

Thanks for sharing. There was a documentary on water cavitation where they used cavitation to really efficiently heat water, it was a spinning cylindrical rotor assembly with lots of shallow round holes, encased in a tight fitting round housing with an inlet and outlet for the water and while rotating, the water passed through and underwent cavitation and rapidly heated in the process. I think the docco was called “Equinox it runs on water”

I love that you simply acknowledged the criticism and moved on, without spiraling into a cycle of self pity and doubt. That’s an engineering skill that can’t be taught, but a necessary skill as there’s always gonna be someone better qualified who’ll tear your work apart, along with your spirit, and you just gotta pick up the pieces keep moving along.

I remember watching the machining video and wondering what the destination was...awesome collab!

TOP 5 Crossovers

I respectfully salute this partnership with Ave for this video. Well done to you sir!

Two of my favorite YT channels collab over a topic I'm fascinated by. What a great friggin day.

A practical engineering and ave collab? What could be better

You just gave me PTSD from my engineering drafting class. Your lines are perfect, well done.

Interesting demo. My dad worked in the water treatment/delivery business for over 40 years. His specialty was back-flow protection, but he also had to deal with cavitation issues. I learned a lot from him about these subjects as a kid, sitting around the dining table. Some of the pump "guts", both large and small, that I got to see were pretty amazing. Hard to imagine if you haven't seen some of it.

Good AvE plug. I love his channel, and now will watch yours

Great video!

A super high-speed camera on that acrylic apparatus could be interesting

Glad to see another channel give AvE some love, enjoy this channel as well.👍

AVE is awesome. Glad you worked with him.

skookum as frig.

I love that the communities around these channels are connected, it gives it the same feel as like the Marvel franchise where it's our *real* universe 🤣 And guys like this and AvE, and This Old Tony are absolutely awesome! I'm pretty sure I've seen every video they've done, and honestly, there's not a single bad one! And yea, AvE is a friggin mystery! TIL the full name of Arduino vs Evil, so now we're one step closer to seeing his face lol. ToT shows himself in at least one video, so the mystery can be abated on that one, but I swear, the amount of knowledge that is stored inside the brain department or Mr. AvE (I *think* his name might be Ralph, I think I heard someone slip one time and called him by name, but not 100% on that haha) But seriously, the vocabulary and his ability to "tongue-tangulate" is absolutely astonishing, and I will straight up Google any references or terms if I don't know them, just in hopes to keep up with the info! Anyway, I love that science, engineering, and the like are popular and presented in an interesting way. Keep 'em coming!

Collab between two of my favorite channels. I remember watching AvE try to make that part a while back and it is a nice surprise to see it was for your channel!

AvE is sooo awesome. Love that guy. we need more of him.

"I have an engineering demonstration somthing channel, and he has a clapped-out Bridgeport" Lololol🤣

The big issue with cavitation is the shape the water makes as it condenses back to water. The bubble on a surface collapses which forms a needle end which is what destroys the surface of impellers and whatever else you have. Here's a link to a video of the collapsing bubble forming a small, sharp acceleration of the water. Edit2: I never added the video... Weird. Here it is: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ZaB5B3pec-A.html

That's awesome I've been watching AvE for a very long time and never new what it stood for!! And what a great explanation!

We love you Grady!!!! One of the best channels on youtube, truly top notch

Haha! Cutting AvE off before he could get to his dirty jokes! Classic.

OHHH THAT'S WHAT HIS NAME STANDS FOR!

Congratulations !!! Very well done and explained !!! I never heart about this property of fluids in my 60 years life but it´s never late to learn. Thanks a lot !!! Have a good life !!!

Excellent work, thumbs up to Ave also, I've admired his realistic tool and tool manufacturing appraisals as well, which are equally matched by his dry sense of humour. Keep em coming. Thank you

The AvE linked videos don't lead to anything anymore. I would be very curious to see what went wrong.

So thats what he was milling that thing for all that time ago

AvE is my favorite channel and PE is top 10 for sure.

thumbs up for reaching out to AvE!

Oddly I am wearing my AvE shirt and tomorrow is my dads birthday where I gift him an AvE shirt. His second AvE shirt actually. Also I remember when AvE made this but I never realized it was for you.

You have forever been contaminated by AvE. His shmoo is impossible to remove. The only option left to you is to rename your channel. Henceforth it shall be called _Practical Enginerding._

I love these channels. You and a few others help fill in the gaps the school system left in my understanding of practical science

Ive been waiting years for this video to come out. Thank you

Popular Enginerding!

Name a more iconic duo. I'll wait.

I usually have no idea that I’m interested in a subject until you bring it up. Thanks for the videos!

I haven't been subscribed to you for very long but I've been watching his videos for years. He is by far my favorite RU-vidr along with Ian from forgotten weapons.

"We've never seen his face but we're pretty sure he's handsome." Nomination for the 2018 best line awards.

You had me a fluid cavitation. ❤🤣

This is why the idea of RU-vid collabs was born. Good stuff.

Thanks for your videos! I really enjoy them. Please keep them coming!

It's like seeing the preacher roll up to the church on a Harley. o.O

Jeeez, we were waitin for this vidjeo since 1999!

Thank you both for the explanation, I now have two new guys to watch. Nice work guys!

Dude, both of you guys are awesome!

Interesting to see Blue Apron still sponsoring channels. Chose a good one to sponsor though

I feel like Watts is a terrible name for a company that makes gauges for pressure.

Pretty cool to see 2 of my favorite channels get together.

Nice to see you two Nerd up!!

What an interesting pairing. Grady is so wholesome and AvE is so... well...

I was wondering when that thing would come back.

its cool to see two of my longtime favourite channels to connect like this. Sorta validates this middle ground universe I call home

Two of my favourite content creators! :)

The water phase diagram didn't correctly indicate that liquid water is more dense than ice by the slope of the line between the solid and liquid be phases. (Note: I'm a chemist). Also, I have personally used sonicating baths which function via cavitation to remove air bubbles from solutions as well as used ultrasound the lyse open bacterial cell walls as a step in protein purification. It's interesting to see how people outside my field use the same physical processes.

haha! now I have understood why when I bend the garden water pipe I can hear a strong noise of bubbles! Just some Bernoulli's shit going on there

Welcome back Sir! Am so happy that you're back with a new vid. :)

This is the smartest engineer, needs more subs.

AvE videos are gone. Any backup of his videos? Be awesome to see those :)

Your drawings were fine. The only dimension thats unclear is the minor diameter of the tapered hole but if it was drawn to scale, theres enough info there. I think Ave went about it the wrong way.

Nice collaboration. I enjoy both of your channels.

YES ! I finally figured out who he made that for lol. AvE is the man!! Glad to see

SUOMI MAINITTU, tai lähinnä vilahti ruudulla

Does anyone know what happened to the related AvE videos?

Loving these videos, thanks.

I always get excited when my favorite youtubers do collaborations

“There’s three ways to do this: the dirty way, the hard way-” *What’s the third way??*

An even cooler example of cavitation in nature would be the pistol shrimp! Mantis shrimp do use cavitation, but they also just punch their prey very hard. Pistol shrimp have a single large claw with natural springs built into the chitin. They ratchet the claw open, and can then slam it shut with such force that it creates a cavitation bubble. When the bubble collapses, the resulting shockwave can stun, or even kill prey outright. Moreover, they can use the sound to communicate! Pistol shrimp get their name from that loud, gunshot like noise. They can be clearly heard in an aquarium from across the room. They're the loudest animal in the world, creating sound over 200dB. When colonies of thousands gather on a reef, the cacophony can disrupt sonar. Other animals around the reef use it to navigate at night, because they can always hear what direction the reef is. Mantis shrimp accidentally create cavitation. Pistol shrimp do it on purpose.

I'm now learning about cavitation in university, fluid's MEC are amazing, AND this channel too. Greets from Chile!

i like your practical engineering approaches

I always thought it was Age vs Experience.

Woooo AvE

well explained, clear and concise. thank you

Lol, I think the video in question was actually the first AvE viedo I watched and made me a regular watcher. Love the ironey.

A nice vid at 4 am :D

Very cool and interesting but.... Did you consider that (some of) the bubbles you are generating is just air degassing out of the water? I presume you are using mains water at about 5 bar (70 PSI) and 15 C (60 Frankenstein). It potentially contains about 0.09 Vair/Vwater. This dissolved air will "degas" out of the water well before you get to the cavitation point of water. I believe you have some air in your water based on the bubbles we see in a couple of shots just before you start the flow. Also, the bubbles survive a long distance up the venturi from the restriction. Longer than my intuition would think a cavitation bubble could survive. All in all an excellent bumble f**kery.

Great show man!

Thanks! I've been around cavitation and venturis with exhaust primers and pumps but never realized that steam was the culprit. I didn't know where the vapor came from so thanks for clearing it up. Just pile a pressure cooker principle only lots more potent. Thanks again!

Hello, it's brilliantly explained. Thank you very much. You do a pretty good job. bye bye Toni . PS: Sorry for my bad English, but I'm from Bavaria ( south Germany )

OOOOOOOOOO FACK YEAAAA

Nicely done video!! I like the way you present the information so even those of us who aren't engineers (yet) can figure it out!!

AvE is one of the smartest people I've ever seen. His channel is too good