Hi all,
I hope everyone is doing well and is in good health.
In the simulation it is needed to change the phase of water that flows through an air domain. So I used Laminar Flow and Level Set physics in order to simulate the interface between air and water. At the end of the air domain, there is a Wetted Wall and water reaches this boundary. Now, if I want to change the phase of the water, how can I use Heat Transfer in Fluids--->Fluid 1--->Phase Change Material 1 for the water that is interfaced with air in one domain? When I am using Heat Transfer I have to select a domain; So the Heat Transfer does not follow the new geometry of water. Do anyone have an idea about changing phase of water in this case?
I appreciate your time and consideration.
well, your question is having some data missing. What is your boundary conditions? and temperature of both air and water at that boundaries? is it thermal equilibrium obtained when the wall wetted or under cooling? then only we can identified whether the phase change occurs or not. from your question I can understand the air is gets dew point temperature when the water reaches saturated liquid temperature at particular operating pressure or undercooling takes place. Then only the air gets condensed and droplets forms over the wall surface .
Dear Kathiravan,
I sent several pictures to show the boundary conditions. The initial temperature for both air and water is 293.15 K. When the fluid reaches the wetted wall, the temperature of water should decease and from Phase Change Material, the phase should change to solid. But there is a problem because I can not select the water that is formed over the wall surface for Phase Change Material and I forced to select a domain of geometry for this condition. I hope this pictures will help for the problem and I appreciate your time and consideration.
From these photos it seems to be (especially in the low temperature side 200K =-73degree C it is almost near to the boiling temperature of liquid nitrogen ) In that temperature the surface of the phase change material that contact with out/in side air. Air contains some water vapor that condensed and wetted forms. if you don't want wetted surface , the phase change material surface should be critically thermal insulated without change of geometry (shape). thanks
Dear Kathiravan,
Thank you for your answers. The first photo that I am sending now is my result for changing the phase when I choose a domain for this Physics in COMSOL and we can see where the phase is changing (from red to blue). I have also sent the wetted wall boundary condition. It seems that COMSOL did not follow the form of the droplet and worked for all domain that i chose. I do not know if it is possible to change only the phase of the droplet. Do you have any idea?
Regards
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