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Pyrolysis in FireFOAM - default assumptions included in developed version?

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Old   August 29, 2019, 03:29
Default Pyrolysis in FireFOAM - default assumptions included in developed version?
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Hello Foamers,
In FireFOAM manual under pyrolysis modelling, I have came across the following statement as shown below.
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.

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)
Kwiatkowski et al., 2014 -- (2)
Ding et al., 2015 -- (3)
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)
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 ~

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 !!
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