Learning Forum

[feroz.mulani85]

I am trying to simulate microsize particles laden melting of Phase changing material. For doing so i tried enabling eulerian phase model on, but then it automatically disabled the solidification and melting option as shown below

 

As can be seen in the above console window an warning message is shown.

But if i tried with Volume of fluid model, then there was no option for specifying the diameter of the glass beads, drag model etc.

I want to simulate PCM with microsized glass beads with dia 11 micrometer, using Syamlal O brien model.

Please reply soon.

Thanks 

[Rob]

If the beads melt do they then stick together?  

[feroz.mulani85]

No...beads remain solid throughout the simulation..there is no phase change of glass beads 

[Rob]

OK, so just the carrier fluid changes phase. 

The solidification/melting model works by freezing flow in cells below the solidus temperature. So, for Eulerian you can possibly use phase interaction or material properties to do this.  Equally, at 11microns the glass beads may follow the flow, if so, do you need to include them? Or if the volume fraction is low maybe DPM? 

There are options, but you need to do some more reading to understand how/what the solver does to then apply that to the specific example you wish to model. 

[feroz.mulani85]

Yes... once the PCM melts, the glass beads will flow with liquid PCM, and the volume fraction will be around 1%

[Rob]

At 1% DPM may be suitable, then it's single phase and solidification/melting is available. 

[feroz.mulani85]

I tried as you suggested using discrete phase modelling in fluent, but then there is no option for (pure solvent melting heat), solidus temperature, liquidus temperature etc. 

Then how will be the phase changing will occur ?

[Rob]

There should be for the carrier phase. You mention that the particles remain as a solid.