# phase change of water to water vapor by hot gas flow

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 December 1, 2014, 03:42 phase change of water to water vapor by hot gas flow #1 New Member   dhiraj Join Date: Jan 2013 Posts: 5 Rep Power: 13 hi i m doing phase change problem in cfx which consist of fuel and water enter from top and hot gases from bottom side. How do i model such problem? so that water get transformed into water vapor? If anyone is aware of such problem, please let me know. Thank you

 December 5, 2014, 01:02 #2 New Member   dhiraj Join Date: Jan 2013 Posts: 5 Rep Power: 13 Hi everyone I tried with HBM, but as i know it only works for single phase problem. I didn't get any idea- how the water gets transformed into water vapor by taking away heat from hot gases. Please help me to solve this problem.

 December 5, 2014, 07:20 #3 Senior Member     Mr CFD Join Date: Jun 2012 Location: Britain Posts: 361 Rep Power: 14 You'll probably need the thermal phase change model. This model is not intended for novices - and there arent' any tutorials that I know of using this model. Theory of this model is in the theory guide.

December 8, 2014, 02:55
#4
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dhiraj
Join Date: Jan 2013
Posts: 5
Rep Power: 13
Quote:
 Originally Posted by RicochetJ You'll probably need the thermal phase change model. This model is not intended for novices - and there arent' any tutorials that I know of using this model. Theory of this model is in the theory guide.
Thank you Mr. Ricochet
I used Thermal change model with saturation temperature but this is not working properly here.
I modeled this problem as 4 phases- water, water vapor, fuel and gas. As water has some fraction at start so after completion of solve it shows water vapor fractions towards the fuel outlet boundary, which is not correct. It should be observed towards gas outlet boundary, as vapor density is lower than water and fuel.
Here in this problem water is at the start and it gets converted into vapor by taking heat from gases. How do i model this to get correct answer?