Modeling of a Moving Reacting Carbon Char Particle Using Macropore-Resolved and Porous Media Approaches
Bibliographic record
Abstract
This work presents a comparative computational study of the heterogeneous combustion of a single spherical carbon char particle in hot atmospheres with different O 2 concentrations using a porous media model (PMM) and macropore-resolved simulations (PRS). A two-dimensional axisymmetric computational fluid dynamics model (2D CFD) in a pseudo-steady-state approach (PSS) is performed. In both cases, a semiglobal kinetic scheme is implemented, including three heterogeneous and three homogeneous chemical reactions. Several Reynolds numbers (Re in = 10, 50, and 100), inflow gas temperatures ( T in = 1100–2000 K), and inlet mass fractions of oxygen (Y O 2,in = 0.05 and 0.11) are assessed. Results show good agreement between PMM and PRS, especially for T in = 2000 K, where the deviation in the values for the species was not higher than 8.3%. Maximum deviation for CO 2 was 1.54% when evaluating the maximum values for the species concentration. In addition, the effects of the gasifying conditions, oxidative regime, and tortuosity on the partial oxidation process are discussed.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".