residual energy compressed air / hydraulic oil

[volaff]

Hello, everyone.
I have a doubt about energy associated with a compressible fluid (air) and an incomprehensible fluid (hydraulic oil).

example:
air (compressible flux)
density: 1.22 kg/m3;
pressure: 6 bars;

oil (incomprehensible flux)
density: 1000 kg/m3;
pressure: 300 bars;

In the event that I had, for example, a pneumatic circuit in one case, plumber in the other and, at some point, the stem of a cylinder is attached, to which of the two fluids is associated with the greater residual energy and why?

in the first line would tell me the hydraulic circuit seen pressure and density higher than the pneumatic one.

comparison?

 

[meccanicamg]

the air cylinder ... having compression you have a release of energy after the ink.
Of course, turn off the power station and see what happened. the residual pressure is at central stops.
the hydraulic cylinder in theory does not have any. oil compression is qui.
in an oleodynamic circuit if I have cylinders moving without current, generate pressure and forces.
the question of whether you've ever placed doesn't make much sense.

Expand the real problem and let's see what's wrong.

 

[volaff]

Bye.
first of all thanks for the answer.
more than anything my question was the result of a chat with a friend.
in summary:
- an air cylinder, as it has a compressible fluid, has a certain release of energy after the disaster;
- a hydraulic cylinder, as it has an incomprehensible fluid, does not have an energy release after the disaster (possibly it will be "minimum").

Is everything correct here?
Did I understand?

 

[meccanicamg]

Bye.
first of all thanks for the answer.
more than anything my question was the result of a chat with a friend.
in summary:
- an air cylinder, as it has a compressible fluid, has a certain release of energy after the disaster;
- a hydraulic cylinder, as it has an incomprehensible fluid, does not have an energy release after the disaster (possibly it will be "minimum").

Is everything correct here?
Did I understand?

if you associate running energy after release could be. but if the oil pressure rose from 100 to 250 bar is no longer so.
everything depends on how the plant is made.

 

[volaff]

Bye.
I agree that everything depends, as you say, on how the plant is made.
the chat was born from considering the pneumatic cylinder or hydraulic for the purpose of a potentially dangerous situation: My friend claimed that, potentially, a compressed air circuit could be more dangerous than one with hydraulic oil, but without making too many accounts.

I will be rusty in fluid mechanics, but I still can't understand how the compressibility of the fluid enters this speech.
Whatever.

Thanks for the chat.
Have a good day!

 

[volaff]

Maybe some formulas could help me understand better.
Can you recommend some technical or manual references?
Thank you very much.

 

[meccanicamg]

Maybe some formulas could help me understand better.
Can you recommend some technical or manual references?
Thank you very much.

I see it difficult to find a manual that supports the matter.
if a circuit remains under pressure, both oil and air but is not fed, or rather, after the inacast closes the oil or air supply valve, you will get that the air piston if you release will presumably do all the race by making the gas expansion. being that work is strength for speed will be great because at speed it is great.
equal diameter an oil cylinder will have a high thrust force if used at many bars but if you disincastra will do you and no 5mm running.

so academically do exercises or impose excels with adiabatic expansions regarding air and compare it with the comprimibilty of oil.
in some cases will win oil and other air. depends on pressure, expansion stroke and comparison diameter.

search for the catalog of hydac nitrogen accumulators or some dispenses that are on the rapid expansion of accumulators. This is what the pneumatic cylinder does.

 

[volaff]

I see it difficult to find a manual that supports the matter.
if a circuit remains under pressure, both oil and air but is not fed, or rather, after the inacast closes the oil or air supply valve, you will get that the air piston if you release will presumably do all the race by making the gas expansion. being that work is strength for speed will be great because at speed it is great.
equal diameter an oil cylinder will have a high thrust force if used at many bars but if you disincastra will do you and no 5mm running.

so academically do exercises or impose excels with adiabatic expansions regarding air and compare it with the comprimibilty of oil.
in some cases will win oil and other air. depends on pressure, expansion stroke and comparison diameter.

search for the catalog of hydac nitrogen accumulators or some dispenses that are on the rapid expansion of accumulators. This is what the pneumatic cylinder does.

All clear.
I think the stabilus or suspa catalogue is equivalent.

Thanks again.

 

[meccanicamg]

a beautiful dispensation that extends allegata.

 

[volaff]

a beautiful dispensation that extends allegata.

Thank you so much!! ! !