The permeability of wood‐chip beds: The effect of compressibility
Bibliographic record
Abstract
Abstract In this work, we present a methodology to characterise the permeability of a compressible bed of wood chips under mechanical load. We show that under the limiting condition of when the mechanical compression is large in comparison to hydraulic pressure the equations of motion can be linearised and solved to produce an expression approximating the variation in porosity along the length of the bed. We show how this may be used, in conjunction with multiple linear regression to estimate permeability of the bed. In the experimental portion of the work we measure the permeability of a bed of hemlock wood chips at three different kappa numbers κ , and compacted to three different mechanical loads, i.e. compaction pressures p c . The usefulness of these estimates was then tested by predicting the pressure drop versus flow relationship for conditions outside the range of the linearised solution; the equations of motion were solved numerically with knowledge of the measured permeability. Good agreement was obtained. After accounting for compressibility effects, we find that our correlation has lower flow resistances than the literature correlations. © 2011 Canadian Society for Chemical Engineering
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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 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| 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".