CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

Pyrolysis in FireFOAM - default assumptions included in developed version?

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   August 29, 2019, 04:29
Default Pyrolysis in FireFOAM - default assumptions included in developed version?
  #1
Senior Member
 
Kumaresh
Join Date: Oct 2016
Posts: 355
Rep Power: 12
Kummi is on a distinguished road
Send a message via Yahoo to Kummi
Hello Foamers,
In FireFOAM manual under pyrolysis modelling, I have came across the following statement as shown below.
Quote:
It was complained that the model ignores:
(i) the change of solid volume,

(ii) the evaporation of free and bounded water, (moisture embedded in the coal)

(iii) liquid phase melting and so on.
In OpenFOAM by default, the FireFOAM is well supported for 1D solid pyrolysis modeling. With that in mind, I managed to extract and build a solver for a modified version of pyrolysis only (for dry coal - without moisture) based on FireFOAM.

QUERY:
Quote:
wet wood → dry wood + H2O (equilibrium model)
dry wood → solid product + gas (Arrhenius model)
As a next step, I need to build the model for wet coal pyrolysis involving the influence of moisture drying. By default, FireFOAM ignores the evaporation of free and bounded water. In developed versions of FireFOAM, such assumption of evaporation is included ? I guess NO.

I identified 3 core papers related to moisture evaporation:

Pozzobon et al., 2014 -- (1) https://www.sciencedirect.com/scienc...78382014002896
Kwiatkowski et al., 2014 -- (2) https://www.researchgate.net/publica...penFoam_solver
Ding et al., 2015 -- (3) https://www.sciencedirect.com/scienc...96890415003325
However, in above papers, drying and pyrolysis reactions are modeled using Arrhenius-like degradation chemistry. But, in my case, drying is solved as equilibrium model as shown below (low temperature drying where free water boils at 100deg)
Quote:
T= 100 ==> alpha [moisture content) =0]
Based on it, mass and heat balances are calculated at interface as,
Mass balance (r) = rho * alpha * (dx/dt) [kg/m2.s]
Heat balance (-K dT/dx) = (r) * latent heat [W/m2]

REF - Clear details here in this MANUSCRIPT ~ https://www.sciencedirect.com/scienc...16236183902259

I would really appreciate if anyone could give me a hint where to look at or point me about the implementation of MOISTURE DRYING mechanism in OpenFOAM.

Thank you !!
Kummi 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
Need suggestions about technical difficulties - Drying + Pyrolysis of coal particle Kummi OpenFOAM Running, Solving & CFD 12 April 26, 2022 14:24
Definition of y+ in yPlusRAS (1.7.1) Taka1 OpenFOAM Programming & Development 41 May 23, 2020 13:05
[OpenFOAM.org] OpenFOAM 5.x (mrklein patch) and macOS High Sierra podallaire OpenFOAM Installation 14 March 27, 2020 15:45
error compiling modified applications yvyan OpenFOAM Programming & Development 21 March 1, 2016 05:53
Compilation errors in ThirdPartymallochoard feng_w OpenFOAM Installation 1 January 25, 2009 07:59


All times are GMT -4. The time now is 20:46.