Is vacuum = pressure for same material?
Is vacuum = pressure for same material?
(OP)
In transfering material along a pipe would the pressure required to move this material be equal to the vacuum required to move the same material anlong the same pipe?





RE: Is vacuum = pressure for same material?
RE: Is vacuum = pressure for same material?
RE: Is vacuum = pressure for same material?
RE: Is vacuum = pressure for same material?
RE: Is vacuum = pressure for same material?
That said, absolute pressure strongly affects the density of gasses so when it comes to blowers it can make a big difference as to whether you are "pushing" or "pulling".
If you keep the pipe size the same, the velocity in the suction to a blower is greater than at the discharge even though the mass flow rate is the same.
RE: Is vacuum = pressure for same material?
RE: Is vacuum = pressure for same material?
Secondly, for this condition to be true, the pressure drop in the pipe shouldn't exceed the atmospheric pressure at your location minus the vacuum pump losses.
RE: Is vacuum = pressure for same material?
I have calculated that as a "pressure" it would require 1.95 Bar, to move my fluid along a pipe.
BUT, our vacuum is only capable upto 0.2 Bar or 200 Mbar.
Have I got somthing wrong?
RE: Is vacuum = pressure for same material?
Will go ahead and hope for best on pipe!
RE: Is vacuum = pressure for same material?
RE: Is vacuum = pressure for same material?
In fact by further "adjustment" I now have it down to 0.21 Bar.
RE: Is vacuum = pressure for same material?
I think it just about right time to stop further learning on this issue
RE: Is vacuum = pressure for same material?
RE: Is vacuum = pressure for same material?
Just wait until after I have intalled the pipeline and it blocks, I will end up being used as a "pig" to clear the line!
RE: Is vacuum = pressure for same material?
RE: Is vacuum = pressure for same material?
As to your comment re exceeding the vapour pressure, yes you could vapourise the liquid by applying vacuum, it therefore follows that you can only use vacuum to transport a liquid so long as the vacuum equipment can handle the vapour being produced and maintain a lower pressure than on the supply side.