Fun fact: the swooshing noises in Kung Fu movies is a result of the Kung Fu master creating high and low pressure zones as he swings his stick around, blocks a punch, or kicks. Some compress the air so much so fast it creates a sonic boom. swooshhhhhh boom mixed with meat being slapped.
This is why we can't try to assume everyone is the same. Most people could never study a subject like this or never would. Yet it is very important to, I'm sure, many technologies. If you stop rewarding people for their work they will just sit around and be mediocre.
Everyone is different, agreed! But most anyone can study any subject to some basic level of competency, if required! And rewarding people for their labor is how labor works! :)
@@Bob-yl9pm Anyone that hasn't challenged themselves to be better, despite some discomfort or sacrifice, is mediocre. I do think your misreading my comment and possibly fishing for a debate where you probably should not.
Now I can understand how cavitation can cause damage, and lead to pitting, and failure of cylinder head sleeves, where antifreeze makes contact with the exterior of the sleeves, in diesel engines.... WOW !!
This makes me think if military fighter jets. When you see them flying and they suddenly accelerate you can observe the appearance of a vapor trailing off of their wings.
Cavitation occurs in liquid and doesn't occur in gases. So you are wrong I think. The vapour trail is most likely unburned fuel due to fuel rich condition.
"Conn, aye. All right, Ryan, we just unzipped our fly. Mr. Thompson! Open the outer doors, firing point procedures. Now if that bastard so much as twitches, I'm going to blow him straight to Mars."
Great video - I learned a good deal. But I am very disappointed that they did not demonstrate the change in lift and drag in the super-cavitating hydrofoil. I was sure he was going to come back around to it and it was the thing I was most interested to see. If cavitation is unavoidable, then they go all-in and make the sharp leading edge, but WHY? I want to know what the benefit is.
Very interesting and informative video, I saw the movie "Red October" and was wondering what cavitation is exactly. Now I know. A question : is it the same phenomenon which explain water evaporation at low pressure like on Mars ?
Cavitation is the bubbles that form in a liquid as it boils by any combination of high temperature and low pressure. On Mars water boils at low temperature simply because the atmospheric pressure is so low.
@@kxkxkxkx that's true 😂 but is it relevant? 🤔the wingtip vortices are low pressure areas in both liquid and air, so it's expansion, not compression, right? Yet liquid boils, humidity condenses at the propeller wingtips...
This video may be old but is actually the first one which helped me , a layman, to fully comprehend this phenomenon. Thank you for uploading
That's because it doesn't treat the viewer like an idiot.
Fun fact: the swooshing noises in Kung Fu movies is a result of the Kung Fu master creating high and low pressure zones as he swings his stick around, blocks a punch, or kicks. Some compress the air so much so fast it creates a sonic boom. swooshhhhhh boom mixed with meat being slapped.
My friend, thank you very much for sharing this!
An oldy but goody. Thank you!
Very precious video.
This is why we can't try to assume everyone is the same. Most people could never study a subject like this or never would. Yet it is very important to, I'm sure, many technologies. If you stop rewarding people for their work they will just sit around and be mediocre.
Everyone is different, agreed! But most anyone can study any subject to some basic level of competency, if required! And rewarding people for their labor is how labor works! :)
People don't tend to be mediocre without employment. I'm retired, does that make me mediocre?
🙄
@@Bob-yl9pm Anyone that hasn't challenged themselves to be better, despite some discomfort or sacrifice, is mediocre. I do think your misreading my comment and possibly fishing for a debate where you probably should not.
The ideology that we are all the "same" is strong than ever. Meritocracy is going to die soon unfortunately...
Old is Gold!!!
Great, thanks for sharing. What a gem.
Now I can understand how cavitation can cause damage, and lead to pitting, and failure of cylinder head sleeves, where antifreeze makes contact with the exterior of the sleeves, in diesel engines.... WOW !!
Thanks! It's educational.
Absolutely fascinating !!!
This makes me think if military fighter jets. When you see them flying and they suddenly accelerate you can observe the appearance of a vapor trailing off of their wings.
Cavitation occurs in liquid and doesn't occur in gases. So you are wrong I think. The vapour trail is most likely unburned fuel due to fuel rich condition.
"Conn, aye. All right, Ryan, we just unzipped our fly. Mr. Thompson! Open the outer doors, firing point procedures. Now if that bastard so much as twitches, I'm going to blow him straight to Mars."
Nuclation and cavitation are initiated similarly to cystal growth in a solid.
Best of all on the subject
Oldie but a goodie
I would love to see this video updated, or appended, with analysis to include the Sharrow (Gregory Sharrow) Marine propeller.
Wow that video really blew my hair back! Thanks for posting this.
Correct and concise language 🧐,..........u no what I'm saying . God help our country 😴
Good video.. need to make a pot of coffee to watch the entirety.
1:22 these cavitation trails are exactly the shape that propeller needs to be
Old, yet better, than probably most crap, you'll ever see on TV (as someone, who has not watched TV for > 25 years)
I like this demostration
Very well presented.
What is the rate of fluid flow in the Venturi tube to start cavitation? And what are the diameters of the tubes?
This is excellent, this is the content we want to see
Cavitation captivation!
I like stuff like this
Great video!
I just came here looking for information on how to change my impeller and wearing on my seadoo 😂 but good to know
Great video - I learned a good deal. But I am very disappointed that they did not demonstrate the change in lift and drag in the super-cavitating hydrofoil. I was sure he was going to come back around to it and it was the thing I was most interested to see. If cavitation is unavoidable, then they go all-in and make the sharp leading edge, but WHY? I want to know what the benefit is.
What happens when you super saturate the flow? Ie... if you were to boundary layer the prop? Feed the exhaust out of micro holes on the blad3s?
could holes in the blade at the centre of max cavitation introduce water to negate the lower pressure and hence lower cavitation.?
That will also cause lower thrust and lower efficiency.
I cant believe all this is going on in my mouth! My dentist says I have 2 cavitations. Crazy, I don't feel anything.
way more interesting than I expected
Very interesting and informative video, I saw the movie "Red October" and was wondering what cavitation is exactly. Now I know. A question : is it the same phenomenon which explain water evaporation at low pressure like on Mars ?
Cavitation is the bubbles that form in a liquid as it boils by any combination of high temperature and low pressure.
On Mars water boils at low temperature simply because the atmospheric pressure is so low.
Pure , straight forward sweet science ❤.
So essentially the heat I d simply a process to lower pressure to the point of cavitation
Could Frouds tanks be used to visualise cavitation?
I think we have a new subject matter for the Slo Mo Guys.
👌
"Maneuver Con CAVITATE, CAVITATE!"
Another The Slow Mo Guys 100 years ago
I always wondered why it hurt when I swim
Check out that blue light implosion @ 19:50 …..guess the refussion of hydrogen and oxygen gets real hott.🔥……….🤓
fluid: gas bubbles form at ship propeller wingtips
air: water condenses at airplane propeller wingtips
erm... why is this apparent contradiction?
Air compression is easy, liquid compression is hard ☝️
@@kxkxkxkx that's true 😂 but is it relevant? 🤔the wingtip vortices are low pressure areas in both liquid and air, so it's expansion, not compression, right?
Yet liquid boils, humidity condenses at the propeller wingtips...
Explains contrails to a point too.
cavitation= no space shuttles.
Muy Interesante. Would Enjoy the layman's expansion on this statement.
cavitation bubble = black hole
Good video, but sound is out of sync