An Elliptical Tube Array as a Cross Flow Heat Exchanger
Bibliographic record
Abstract
Airside heat transfer and fluid flow characteristics of a single array cross flow heat exchanger, made of elliptical tubes, were studied. The heat exchanger, consists of 18 tubes each of 30 cm long with 0.30 minor to major outside axis ratio and equally spaced by 0.61 cm gap, was oriented in a 30 cm by 30 cm test section of a wind tunnel with the major axis parallel to the air flow. Tests were performed with hot water flowing inside the tubes, while cold air flowing across them externally. The mean temperature difference between the approaching air and the surface of the tubes was maintained at roughly 14±2°C. Reynolds number based on the mean free stream air velocity and hydraulic diameter of the elliptical tube was varied from 4500 to 15000, while that based on the mean water velocity inside the tube was altered from 1400 to 7400. The results showed that the heat transfer rate increased with the airflow rate in a power law relationship, giving an average Nusselt number on the airside, which varied with the corresponding Reynolds number also in a power law manner. The results were compared with previously established similar studies and correlations.
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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 | 0.000 |
| 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) | 0.002 | 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".