If you removed all the dissolved air from water, and revved a prop in it, would cavitation still happen?

[dug777]

Just a quick question

 

[jagec]

of course. water has 3 phases.

 

[Fullmetal Chocobo]

I don't believe cavitation is releasing the dissolved oxygen in the water, so much as it is creating a pocket of low pressure.

More importantly, do the toilets down in Aussie actually flush in the other direction??? And what if you are on a ship, and you flush the toilet, and then cross the equator?

 

[dug777]

Originally posted by: jagec
of course. water has 3 phases.

thats what is suspected, cheers

FmC: the coriolis (sp) effect is overruled in most cases by the bowl design iirc...

 

[Fullmetal Chocobo]

Originally posted by: dug777

Originally posted by: jagec
of course. water has 3 phases.

thats what is suspected, cheers

FmC: the coriolis (sp) effect is overruled in most cases by the bowl design iirc...

Go drain some water from the bath tub, and let me know.

 

[CaptnKirk]

Cavitation is caused by frictional heating of the water by a propeller causing it to boil in a reduced pressure area.

 

[FoBoT]

cavitation is the formation of a steam bubble, not an air bubble

your supposition is false

 

[IronWing]

Originally posted by: Fullmetal Chocobo
More importantly, do the toilets down in Aussie actually flush in the other direction???

Yes, that is why Aussies smell the way they do.

 

[Rogeee]

Cavitation is caused by a low pressure area at the trailing edge of the prop, it has nothing to do with raising the temp of the water, as pressure decreases the boiling point drops, the water does not get heated up, the same applies in reverse, if you pressurise water, the boiling point raises, this is why you have a pressurised cooiling system in your vehicle, it raises the boiling point of the coolant thus preventing air pockets from forming in the cooling passages of your engine.

 

[Mr.IncrediblyBored]

What does this thread have to do with Australia?

 

[Tu13erhead]

Originally posted by: Fullmetal Chocobo
And what if you are on a ship, and you flush the toilet, and then cross the equator?

A vortex opens.

 

[loic2003]

Originally posted by: Tu13erhead

Originally posted by: Fullmetal Chocobo
And what if you are on a ship, and you flush the toilet, and then cross the equator?

A vortex opens.

If you flush exactly on the equator it doesn't roatate at all apparantly. Just goes striaght down.

 

[loic2003]

Wikipedia is your friend:

Major places where cavitation occurs are in pumps, on propellers, or at restrictions in a flowing liquid.

As an impeller's (in a pump), or propeller's (as in the case of a ship or submarine) blades move through a fluid, low pressure areas are formed as the fluid accelerates around and moves past the blades. The faster the blades move, the lower the pressure around it can become. As it reaches vapor pressure, the fluid vaporizes and forms small bubbles of gas. This is cavitation. When the bubbles collapse later, they typically cause very strong local shockwaves in the fluid, which may be audible and may even damage the blades.

Nothing to do with air wihtin the water.