modeling equilibrium state of 2-phase saturated nitrogen

muyongbin · April 11, 2011, 02:22

hello alls
hope you have a good day. I want to model a equilibrium state of the 2-phase saturated nitrogen using CFX recently , but no idea how to do that.
problem description:

a cooper bar is inserted into a pressure vessel which is colsed and full of liquid nitrogen initially . all boundary congditions are adiabatic except two
planes: the top of the bar keeping the constant temperature 300K ,and the bottom of the vessel keeping 70K.
so heat leak into the vessel and go out through bottom .
that lead to pressure , level state in a equilibrium.
I only interested in the steady modeling .

who have experience in modeling such a phenomenon, please give me some suggestions.
best regards, mu

I appreciate giving a email to me

muyongbin@163.com

ghorrocks · April 11, 2011, 06:23

This would be very hard to model in CFD. If you are interested in the final steady state answer I would try to simplify it down to a 1D model and use matlab or a fortran program to solve it. Is that possible?

muyongbin · April 12, 2011, 01:17

thanks ghorrocks
it can not be simplydied to 1D .
as it is just one part of an integral problem in practice

best regards
mu

April 11, 2011, 02:22	modeling equilibrium state of 2-phase saturated nitrogen	#1
muyongbin New Member muyongbin Join Date: Apr 2011 Posts: 2 Rep Power: 0	hello alls hope you have a good day. I want to model a equilibrium state of the 2-phase saturated nitrogen using CFX recently , but no idea how to do that. problem description: a cooper bar is inserted into a pressure vessel which is colsed and full of liquid nitrogen initially . all boundary congditions are adiabatic except two planes: the top of the bar keeping the constant temperature 300K ,and the bottom of the vessel keeping 70K. so heat leak into the vessel and go out through bottom . that lead to pressure , level state in a equilibrium. I only interested in the steady modeling . who have experience in modeling such a phenomenon, please give me some suggestions. best regards, mu I appreciate giving a email to me muyongbin@163.com

April 12, 2011, 01:17	thanks ghorrocks	#3
muyongbin New Member muyongbin Join Date: Apr 2011 Posts: 2 Rep Power: 0	thanks ghorrocks it can not be simplydied to 1D . as it is just one part of an integral problem in practice best regards mu

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April 11, 2011, 06:23		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	This would be very hard to model in CFD. If you are interested in the final steady state answer I would try to simplify it down to a 1D model and use matlab or a fortran program to solve it. Is that possible?