# phase change with CFX

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 February 24, 2012, 01:45 phase change with CFX #1 New Member   K.M.Yang Join Date: Feb 2012 Location: JiNan China Posts: 22 Rep Power: 5 · I want to simulate the phase change in micro heat pipe with triangle cross section, and I set up a model. I made the configuration as follows: 1、water and water vapor are continuous fluids, and they have the constant properties; 2、Free surface model; 3、heat transfer model: Thermal Energy, turbulence model: BSL Reynolds Stress; 4、Surface Tension Coefficient is constant; 5、Surface Tension Force: continuum Surface Force, Primary Fluid is water; 6、Interphase Transfer: Free Surface ; 7、Momentum Transfer: Drag Coefficient 8、Mass Transfer: Phase change, phase change model is “Thermal Phase change” and a constant Saturation Temperature will be given; 9、Heat Transfer: Two Resistant, vapor side set to be “zero thermal resistance” Initial conditions: Velocity Type option is Automatic, the temperature set to be ambient temperature, the volume fraction of water is 0.75 Boundary conditions: Heat flux boundary is applied on the face of heat in and heat out, and adiabatic boundary condition is applied on the other surfaces. Wall contact angle is 101°.no slip wall is chosen for water and water vapor. Results: The simulation results are shown as follows: The phenomena that liquid flows from the condenser to the evaporator in the sharp corners, while the vapour moves from the evaporator to the condenser in the centre of the micro heat pipe is not happened. The whole zone in heat pipe is full of water, that is not identical to the overall mass. And interphase mass transfer rate is too small almost close to zero. So anyone have experience about simulation of phase change point me out the mistake I had made in my simulation? Thanks a lot!

 March 22, 2012, 02:12 HI #2 Senior Member   Danial Join Date: Nov 2011 Posts: 179 Rep Power: 5 Did u solve that problem??

 March 22, 2012, 08:49 #3 New Member   K.M.Yang Join Date: Feb 2012 Location: JiNan China Posts: 22 Rep Power: 5 Hi，friend I haven't work out that problem yet. Are you interested in this problem or somrthing like this?

 March 28, 2012, 00:29 #4 New Member   Haider Muhammad Join Date: Dec 2011 Posts: 5 Rep Power: 5 Hi, I was also trying to use phase change model for mixture flows inside condenser tube but unfortunately the model is extremely disappointing so far! IPMT rates are actually negligible. Have you come up with some solution?

 March 28, 2012, 02:28 HI #5 Senior Member   Danial Join Date: Nov 2011 Posts: 179 Rep Power: 5 Hey ! i am also working on some solidification model (including phase change) but unfortunately stuck with some MPF error. still working on it. I am trying fluent for solidification now. u can try" Leap australia"; its some kind of support group for ansys users. just send them ur problem and they would help u to find out any error. it might be helpful for u!!they gave me some suggestions and i ma working on it.

 March 28, 2012, 03:38 #6 New Member   K.M.Yang Join Date: Feb 2012 Location: JiNan China Posts: 22 Rep Power: 5 Tkanks for your information! I will send message to them!

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