Density Effects on Dilution and Height of Vertical Fountains
Bibliographic record
Abstract
The effects of relative density difference on the dilution and height of vertical negative buoyant jets were investigated experimentally. These effects, which are related to fluid density, occurred in addition to the buoyancy effects commonly parameterized by the densimetric Froude number. The density effects have generally been ignored in previous investigations and in practice on the basis of Boussinesq’s approximation. The density effects could, however, be relevant in connection to hypersaline discharges from desalination plants and dense discharges from oil and potash mining industries. A series of seven upward fountain experiments were performed in the laboratory to carry out this investigation. The flow was turbulent, the relative density difference varied from 0.0014 to 0.064, and the densimetric Froude number varied from 2.13 to 15.7. The results showed that an increase in the relative density difference reduced both the minimum return dilution and maximum height of the fountains. The observed maximum reduction in dilution was 48%, and the maximum reduction of height was 19%. The results also demonstrated that upward fountains are dynamically similar to downward fountains.
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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 | 0.002 |
| 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 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 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".