Air demand in plunging dropshafts of medium height
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
Falling water in dropshafts can induce a significant amount of airflow into sewer systems. In this study, the air demand in plunging-type dropshafts with medium drops of 3.38 and 1.88 m were investigated. The downward movement of air in the dropshaft is influenced by two components of falling water: the annular flow attached to the shaft wall and the bounced flow (in the forms of mainstream or water droplets). A model for predicting air pressure gradients was developed and experimentally validated. The air demand increased with the air inlet area, the drop height, the water flow rate, and the ratio of the bounced jet to the total water flow rate. A prediction model for the air demand in dropshafts was developed, thus it is possible to assess the air demand of dropshafts across a range of drop heights, diameters, and inflow conditions. When the air inlet to the shaft is restricted, a large negative pressure is generated inside the shaft, increasing the height of the water-air mixture generated by the bottom jet impact, which reduces the impact pressure at the bottom.
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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 | 0.000 | 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 | 0.000 | 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 it