Knudsen diffusion, gas permeability, and water content in an unconsolidated porous medium
Why this work is in the frame
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Bibliographic record
Abstract
The Knudsen diffusion coefficient was measured at different levels of water saturation for an unconsolidated porous medium consisting of silt‐sized particles. The Knudsen diffusion coefficient was found to increase from 4.4 × 10 −3 cm 2 /s to 1.0 × 10 −1 cm 2 /s as water saturation decreased from 82% to 54%. A comparison between the experimental Knudsen diffusion coefficients and predicted values of the corresponding effective binary diffusion coefficients indicated that diffusion at high saturations (>64%) were in the transition regime between Knudsen diffusion and molecular diffusion. The results suggest that Knudsen diffusion has significant implications for the prediction of organic vapor transport in partially saturated silts and in less permeable soils. An expression was developed for the influence of water saturation on Knudsen diffusion coefficients, using the Brooks‐Corey capillary pressure saturation relationship. Data from previous studies were also combined with results from this study to develop a correlation between the gas phase permeability and the Knudsen diffusion coefficient for variably saturated porous media. For permeabilities less than 10 −10 cm 2 , the new correlation begins to deviate significantly from an existing correlation for dry porous media.
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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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.005 | 0.001 |
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 it