the value of saturation pressure of water at 25C

kostrub · November 19, 2018, 10:03

Hello!
Sorry if my question is silly.
I've read and done tutorial "Drop curve for cavitating flow in a pump".
Water at 25 C and Water vapour at 25 C are used in this tutorial. Saturation pressure for them stated as 3574 Pa (Domain settings/Fluid pair models/Mass transfer/Cavitation).
I googled "water saturation pressure at 25 c" and all links say that it is 3169 Pa at 25 C.
Why is that and is it important for cavitation calculation?
By the way in the material properties of Water at 25 C the value of Reference Pressure (I think it is the same as saturation pressure) is equal 3169 Pa.
Thanks in advance!

ghorrocks · November 19, 2018, 16:59

As a tutorial you can set the saturation pressure to be anything you want. It is just demonstrating how to use the software, not how to do an accurate simulation.

Also note that if the water is not pure the saturation pressure will change. You could give them the excuse that the water they are using is not pure and it has moved the saturation pressure a bit.

kostrub · November 20, 2018, 09:18

Thank you!

November 19, 2018, 10:03	the value of saturation pressure of water at 25C	#1
kostrub New Member Artem Join Date: Nov 2018 Posts: 2 Rep Power: 0	Hello! Sorry if my question is silly. I've read and done tutorial "Drop curve for cavitating flow in a pump". Water at 25 C and Water vapour at 25 C are used in this tutorial. Saturation pressure for them stated as 3574 Pa (Domain settings/Fluid pair models/Mass transfer/Cavitation). I googled "water saturation pressure at 25 c" and all links say that it is 3169 Pa at 25 C. Why is that and is it important for cavitation calculation? By the way in the material properties of Water at 25 C the value of Reference Pressure (I think it is the same as saturation pressure) is equal 3169 Pa. Thanks in advance!

November 19, 2018, 16:59		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,852 Rep Power: 144	As a tutorial you can set the saturation pressure to be anything you want. It is just demonstrating how to use the software, not how to do an accurate simulation. Also note that if the water is not pure the saturation pressure will change. You could give them the excuse that the water they are using is not pure and it has moved the saturation pressure a bit. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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November 20, 2018, 09:18		#3
kostrub New Member Artem Join Date: Nov 2018 Posts: 2 Rep Power: 0	Thank you!