cfbb389fd3
This change adds representation of the shape of a dispersed phase. A
layer has been added to model the relationship between the
characteristic volume of a sizeGroup and its physical diameter.
Previously this relationship was represented by a constant form factor.
Currently, two shape models are available:
- spherical
- fractal (for modelling fractal agglomerates)
The latter introduces the average surface area to volume ratio, kappa,
of the entities in a size group as a secondary field-dependent internal
variable to the population balance equation, which makes the population
balance approach "quasi-"bivariate. From kappa and a constant mass
fractal dimension, a collisional diameter can be derived which affects
the coagulation rates computed by the following models:
- ballisticCollisions
- brownianCollisions
- DahnekeInterpolation
- turbulentShear
The fractal shape modelling also takes into account the effect of sintering
of primary particles on the surface area of the aggregate.
Further additions/changes:
- Time scale filtering for handling large drag and heat transfer
coefficients occurring for particles in the nanometre range
- Aerosol drag model based on Stokes drag with a Knudsen number based
correction (Cunningham correction)
- Reaction driven nucleation
- A complete redesign of the sizeDistribution functionObject
The functionality is demonstrated by a tutorial case simulating the
vapour phase synthesis of titania by titanium tetrachloride oxidation.
Patch contributed by Institute of Fluid Dynamics, Helmholtz-Zentrum Dresden -
Rossendorf (HZDR) and VTT Technical Research Centre of Finland Ltd.
72 lines
1.5 KiB
C++
72 lines
1.5 KiB
C++
/*--------------------------------*- C++ -*----------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration | Website: https://openfoam.org
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\\ / A nd | Version: dev
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\\/ M anipulation |
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\*---------------------------------------------------------------------------*/
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FoamFile
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{
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version 2.0;
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format ascii;
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class dictionary;
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location "system";
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object controlDict;
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}
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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application reactingMultiphaseEulerFoam;
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startFrom startTime;
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startTime 0;
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stopAt endTime;
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endTime 10;
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deltaT 0.1;
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writeControl runTime;
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writeInterval 10;
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purgeWrite 0;
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writeFormat ascii;
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writePrecision 6;
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writeCompression uncompressed;
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timeFormat general;
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timePrecision 6;
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runTimeModifiable yes;
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adjustTimeStep no;
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maxCo 0.5;
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maxDeltaT 1;
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functions
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{
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numberDensity
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{
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type sizeDistribution;
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functionObjectLibs ("libreactingEulerFoamFunctionObjects.so");
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writeControl outputTime;
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writeInterval 1;
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populationBalance bubbles;
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functionType number;
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coordinateType volume;
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densityFunction yes;
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}
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}
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// ************************************************************************* //
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