A 2D Distributed Model of Transport Phenomena in a Porous Media Biodrying Reactor
Bibliographic record
Abstract
A novel continuous biodrying reactor has been developed for drying pulp and paper mixed sludge to raise the dry solids levels so that the dried sludge can be combusted economically in a biomass boiler for energy recovery. A two-dimensional (2D) model was proposed that takes into account coupled mass, heat, and biological transport processes for both gas and solids flow directions. This model was solved numerically using the finite element method. The predicted temperatures reflect the two-dimensionality of the transport phenomena in the biodrying reactor. Despite some discrepancies between the temperature predicted by this model and the experimental data, the estimated water removal rates are in good agreement with measured ones. It was found that only one third of the total water removal takes place in the convection-dominated zone of the reactor, whereas the removal of remaining water takes place in its bioheat- and mass diffusion–dominated zone. It was also found that conduction heat transfer has only a minor impact on the matrix temperature, relative to the bioheat source term and evaporative heat sink term, which play important roles.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.003 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 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 source (direct Gemma or distilled Codex), 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".