# phase change

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 March 3, 2008, 12:57 phase change #1 Robert Guest   Posts: n/a Hello, I would like to simulate a flow, which has phase change, from water to vapor. I use the mixture/cavitation model. I calculate the vaporization pressure with a polynom. I use pressure inlet boundary condition for inflow, and pressure outlet for outflow. The outflow pressure lower, like the vaporization pressure. My problem: The fluent limit the pressure to the vaporization pressure and I don't know, why? If somebody know, please tell it to me Thanks

 March 5, 2008, 03:42 Re: phase change #2 Robert Guest   Posts: n/a Please help me, it is very important for me. Thanks

 March 5, 2008, 11:02 Re: phase change #3 Pavan Guest   Posts: n/a Thanks Robert. It was pretty much what I was doing. I was concerned about the difference I was seeing over flow time. But the error was less than 1.5% That still should not exist but I guess it could be numerical error or something. I guess I won't worry about it.

 March 5, 2008, 11:03 Re: phase change #4 Pavan Guest   Posts: n/a sorry responded in the wrong section!

 March 7, 2008, 02:03 Re: phase change #5 Syed Shabbar Raza Guest   Posts: n/a 23.6.2 Wet Steam Flow Equations The wet steam is a mixture of two-phases. The primary phase is the gaseous-phase consisting of water-vapor (denoted by the subscript v) while the secondary phase is the liquid-phase consisting of condensed-water droplets (denoted by the subscript l). ( and my dear u want to model inverse, i mean here fluent assume that the primary phase is steam, but in your case it is water and i can guess that u have given the boundary condition for water ( inlet condition), so i think we should use inlet boundary condiition for outlet and vice versa plz share your view

 March 7, 2008, 07:09 Re: phase change #6 Syed Shabbar Raza Guest   Posts: n/a for using wet vapors fluent have limitation of 273k to 647k, might be your temperature exceed this limits, that why it limits ur pressure

 May 2, 2009, 06:17 helpppp #7 New Member   tuce Join Date: Apr 2009 Posts: 1 Rep Power: 0 would somebody help me pleasee?I try to simulate two phase flow (water boiling )by cfd .but I could not manage it.I really need its tutorials.my mail address is tuceyilmaz1984@hotmail.com ıf somebody helps I will be very glad.tnanks by now.

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