CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

Change phase phenomena

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   May 4, 2016, 15:56
Default Change phase phenomena
  #1
New Member
 
imane
Join Date: Mar 2016
Posts: 1
Rep Power: 0
Imane is on a distinguished road
Hello everyone,
I am beginner in fluent v15, and I want to simulate the temperature change as a function of time in the phase change materials "PCM" and the heat thermal fluid "HTF" and the PCM fusion Front.
Regarding the geometry I chose to work with two coaxial tubes: the inner tube contains the heat thermal fluid and the outer tube contains the PCM
for meshing I appointed the input, output and symmetry area of ​​HTF and PCM. Also the entry, exit and the symmetry of the wall between the PCM and the HTF
The set up steps followed are:
General ==> Type: based pressure, velocity formulation: absolute, time: transient
Model ==> volume of fluid with 2 stages in number eulerian, energy, melting and solidification
Materials ==> PCM characteristics: density, solidius and liquidus temperature , thermal conductivity, pure solvent latent heat and thermal expansion coefficient
for the HTF I chose to work with liquid water
Phases ==> Primary phase pcm, Secondary phase HTF
Cell Condition box ==> Wall (phase mixture, Type: Solid)
HTF (phase mixture type: Fluid, Fluid porosity: 1)
PCM (phase mixture type: Fluid, Fluid porosity: 1)
NB: I want to determine the porosity of the fluid depending on the temperature f (T)
- f(T) = 0 if T < Ts
- f(T) = 1 if T > Tm
- 0 < f(T) = (T -Ts) / (Tm - Ts ) < 1 if Ts < T < Tm
but I don't know how to do it with new input parameter
Boundary Conditions ==> in this stage I entered the HTF input velocity and the inlet and outlet temperatures of the HTF, PCM and WALL but I find myself stuck facing problem with the symmetry area of HTF and PCM.
and other boundary conditions appear as: wall-htf-wall, wall-htf-shadow-wall, wall-pcm, wall-pcm-wall, wall-pcm shadow-wall, wall-wall
but I do not know what to choose for thermal conditions: temperature convection heat flow or or ...
and if for example I chose the heat flux how can I calculate the heat generation rate and the heat flux.

I will be very grateful for your help and thank you in advance.

Best regards;
Imane is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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 Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
help for simulation phase change sudni COMSOL 0 January 17, 2014 02:47
homogeneous free surface flow with phase change. Niru CFX 13 December 26, 2013 10:27
Pressure Outlet for phase change simulation dinesh FLUENT 0 November 21, 2013 23:50
Solid/liquid phase change fabian_roesler OpenFOAM 10 December 24, 2012 06:37
Solid Phase change material qiulan Siemens 0 June 5, 2006 15:30


All times are GMT -4. The time now is 01:27.