[soumitra2102]

In a subcooled pool boiling simulation under normal atmospheric pressure, am I expected to see rise in pressure level of the liquid phase with time (transient simulation).


I set reference pressure in Pres-processing (ANSYS CFX- Pre) for the domain to be 1 atm and initial condition to be 0atm pressure, still in post processing (ANSYS CFD-Post), I see Pressure contour variable rise ~ 9atm throughout the domain.

[ghorrocks]

I do not understand your question.

I think the first line of your question says you expect to see the pressure rise as the liquid boils - this makes sense if it is boiling in a constant volume container.

I think the second line of your question says that the pressure has risen to 9 atm. So isn't that what you expect? It does sound like a very big pressure rise, you must have a large heat flux to get that much pressure.

[soumitra2102]

Oh sorry,my bad.

The first line is actually a question. Am I expected a pressure rise in the liquid phase for a subcooled pool boiling under normal atmospheric condition?

The pool boiling tank is open to atmosphere from it's top wall (it's a free liquid water surface in contact with atmospheric air (and this atm. pressure)). So it is not a constant volume boiling (also, in simulation, I put Outlet boundary condition with 0 relative pressure).

And yes, the is huge flux, because the temperature of the heating medium is about 240 C. (It's is conjugate heat transfer problem).

[ghorrocks]

If the thing is open to atmosphere then the pressure will remain near atmospheric, with some hydrostatic component and a small effect from and fluid motion generated.

If it is open to the atmosphere but you are generating huge pressures then it sounds like something is wrong.