Strouhal Numbers and Power Spectrums for Turbulent Fully-Developed Flows in Rectangular Ducts with Spatially-Periodic Interrupted-Plate Inserts
Bibliographic record
Abstract
An experimental study of fully developed flows of air in a straight rectangular duct with interrupted-plate inserts is presented. Values of the dimensionless geometric parameters, normalized with respect to the full height of the duct, are the following: width of the duct cross-section = 6.063; plate length = 1.001; plate thickness = 0.252 6; and inter-plate spacing = 1.004. The Reynolds number, based on average velocity at the minimum cross-sectional area and the hydraulic diameter, ranged from 2 000 to 30 000. Single hot-wire measurements and results, which include ensemble averaged power spectrums and Strouhal number distributions, are presented. They show repeatability, vertical and lateral symmetry at corresponding points in the central region of the duct cross-section, and spatial periodicity in successive geometrical modules.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".