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February 23, 2010, 10:39 |
Wood gaisfication simulation in fluent
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#1 |
New Member
dinesh
Join Date: Feb 2010
Posts: 2
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I am b.tech mechanical student studying at vit. iam doing my final year project. iam simulating wood gasification in fluent. could any of you guys tell me how to proceed as iam new to this software.
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February 23, 2010, 19:47 |
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#2 |
Member
chétan
Join Date: May 2009
Location: Australia
Posts: 55
Rep Power: 16 |
Hello Dinesh,
Wood Gasification is interesting area for modelling. To proceed any further do read paper on same area by Di Blasi (2004) in AICHE journal. Secondly, sincere advice is estimate time available for you in your Undergrad Project, and plan accordingly. There are several approaches to carry out Gasification modelling. One can study surface reactions over surface of wood (if you have decent reaction mechanism), or Porous Media approach where wood block assumed to be porous in nature, or by defining wood and gasifying medium in multiphase model. (Euler Granular model with species transport works fine with Solid - Gas reactions). I strongly recommend that study the physics of your problem it first. regards Chetan |
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February 24, 2010, 00:37 |
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#3 |
New Member
dinesh
Join Date: Feb 2010
Posts: 2
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Thanks chetan for your valuable advice.
i have only two months left; i.e march and april actually i did study fluent tutorials and carried out simulations, but results are very poor Slover Slover -Pressure Based Formulation -implicit Space -2D Velocity Formulation -Absolute Gradient Option -Green-Gauss Cell Based Porous Formulation -Superficial Velocity Multiphase Multiphase Model - off Energy -Energy Equation Viscous Model Model -k-epsilon (2 eqn) k-epsilon Model -standard Near-Wall Treatment -Standard Wall Functions Species Model Model -Species Transport Reactions -Volumetric & Particle Surface Options -Inlet Diffusion & Diffusion Energy Source Turbulent -Chemistry Interaction -Finite-Rate/Eddy-Dissipation Discrete phase model interaction with continuous phase number of continuous phase iterations per dpm iteration - 40 tracking parameters max no.of steps - 10000 length scale - 0.01m drag law - spherical Operation Condition Pressure: Operating Pressure(pascal)-101325 Gravity: Gravity- Gravitational Acceleration Z(m/s2)=-9.8 Boussinesq Parameters: Operating Temperature (k)=288.16 i have specified 7 equations in the reactions tab, for wood-volatiles- air mixture properties the first one is a default one 2. C + O2 = CO2 3. H2 + 1/2O2 = H2O 4. C + H2O = H2 + CO 5. CO2 + C = 2CO 6. CO + H2O = CO2 + H2 7. C + 2H2 = CH4 i have specified pre-exponential factor value: 1.3e+08 activation energy:140300 J/kgmol are these values very small, or is there any method experimentally or analytically to determine these values for my wood material please tell me if iam approaching the problem correctly please do send me your email so that i could discuss the problem more elaborately. regards, Dinesh Babu |
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