# VOF with melting of Phase change materials

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 January 23, 2013, 14:05 VOF with melting of Phase change materials #1 New Member   mahmood Join Date: Sep 2012 Posts: 14 Rep Power: 7 Dear all, I m modeling a phase change problem with VOF and solidification. The problem description is a biker containing PCM and air. When i simulate the melting is only from the down and wall side. No melting is occurred due to upper air surface. I m uning pressure outlet for upper boundary condition. can any one help??

 January 24, 2013, 07:36 #2 New Member   anonymous Join Date: Jan 2011 Posts: 23 Rep Power: 9 Melting would initiate from the points where the temperature is above the melting temperature which could be the case near the walls. Pressure outlet boundary has the input for backflow temperature, it means melting of the top layer depends on temperature being initialized in the air phase. thermal energy likes this.

 March 15, 2014, 07:53 #3 Member   Join Date: Jan 2014 Location: Turkey Posts: 37 Rep Power: 6 Hello dear friends, I try to simulate melting process using VOF model. Pcm is solid phase initialy. Upper part of the solid there is air. They do not mix eachother. the rectangular box is %85 full with solid pcm, %15 air Natural convection is active. My primary phase air, secondary phase is pcm (phase change material). I have some questions to be sure about my model. Initial condition of Wholesystem temperature is 293K, but air temp is 300K. how to set air temp ? from materials -referance temperature? For cell zone condition, all cell zone (air, pcm, fin ) show mixture. Also for example, if I change pcm to phase2, all of cell zone change to phase 2 . is it ok or not Only for secondary phase (pcm), I patch within fluent by adapt-region-mark then patch. Ok? Value of volume fraction should be 1 or 0 while patching?? I am confused. Initialy pcm is solid. the rectangular box is %85 full with solid pcm. %15 air For initial values phase-2 volume fraction is 0 or 0.85. Ok? I did some iteration for a short time to check model. For results, in graphics-countors I can not see total temperature for phase 1 and 2 only entalphy values I see for phase1 and 2. Also countors of solidification/melting it shows only mixture. Mixture shows what? Any interaction should I use like surface tension etc. Thanks for your help. ı am really in stuck. good work friends. Ibtissam likes this.

 March 17, 2015, 16:26 help #4 Member   Mohamed Join Date: Jan 2011 Location: Algeria Posts: 44 Rep Power: 9 salam I have a same problem, can you help me with a model, i have a pcm in an closure in aluminium without air, but in VOF there are two phase but i have one. ?????????????????????????????????????????????????? ???

 Tags solidification/melting, vof

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