# How difficult is it to model a parrafin wax phase change?

 Register Blogs Members List Search Today's Posts Mark Forums Read

 August 22, 2016, 11:48 How difficult is it to model a parrafin wax phase change? #1 New Member   Jim McKenzie Join Date: Aug 2016 Location: Cornwall, UK Posts: 2 Rep Power: 0 Hello, I'm new to CFD and would like to know how difficult it would be to simulate a heat exchanger with water flow on one side and paraffin wax on the other. I'm about to start my post grad dissertation for which I've chosen to build a latent thermal heat store which will be connected to an air source heat pump in my flat. It would be extremely advantageous to observe the heat transfer characteristics of different heat exchanger designs, for example shell and tube, flat plate, encapsulated ball etc. before I build it. However I am unsure of how large a task I will be taking on trying to simulate them using openfoam? I have about 2 and a half months before I need to begin building the heat store, I have a bit of programming knowledge through arduino projects (3d printer) and a few friends that would be willing to help me with C++. I have studied basic fluid dynamics (relevant to hydro turbine design) and understand basic thermodynamic fundamentals (entropy, specific heat, enthalpy, thermal conductance etc.). I also have basic 3D CAD skills in autocad and solidworks (plenty to build what I'm thinking of building) Is it feasible to build 2D or maybe basic 3D models that will give me a better idea of which exchanger design to go for and maybe smaller details such as how far away plates in a plate heat exchanger should be to melt 95% of the wax in a given time etc. ? Kind Regards, Jim

 August 23, 2016, 03:04 #2 Senior Member     Anton Kidess Join Date: May 2009 Location: Germany Posts: 1,261 Rep Power: 23 Depends mainly on the complexity of your geometry I think. __________________ *On twitter @akidTwit *Spend as much time formulating your questions as you expect people to spend on their answer.

August 27, 2016, 13:16
#3
New Member

Jim McKenzie
Join Date: Aug 2016
Location: Cornwall, UK
Posts: 2
Rep Power: 0
Quote:
 Originally Posted by akidess Depends mainly on the complexity of your geometry I think.
Thanks for the reply, should be fairly simple geometry so I'm gunna go for it.

I don't suppose you know which solvers would be suited to modelling a phase change in wax?

In the mean time I guess I'll start working through the tutorials. Do you think it would be beneficial to have the newer version of openfoam and paraview? I'm not sure what will be easier, to follow the tutorials with the same version they were written for or to get the newest version and try to piece stuff together from the tutorials?

Cheers

 August 29, 2016, 02:37 #4 Senior Member     Anton Kidess Join Date: May 2009 Location: Germany Posts: 1,261 Rep Power: 23 I would get the newest version. Solvers to look at are buoyant?impleFoam and chtMultiRegonFoam. You also want to get to know solidificationMeltingSource of fvOptions. Perhaps you want to write your own code, as the melting source models the phase change as a porous medium, whereas for a wax you may want to tweak viscosity instead. Tobi likes this. __________________ *On twitter @akidTwit *Spend as much time formulating your questions as you expect people to spend on their answer.

 Tags paraffin wax, phase change

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Imane FLUENT 0 May 4, 2016 15:56 Sanyo CFX 17 August 15, 2015 06:20 Mahesh Bondhu FLUENT 4 May 4, 2013 08:13 Ridley CFX 0 July 21, 2010 07:57 gregor.vidmar153 OpenFOAM Running, Solving & CFD 3 June 10, 2010 06:31

All times are GMT -4. The time now is 09:06.