Parametric Wall Shear Stress Characterization of the Rotating Cage Test Method
Bibliographic record
Abstract
The rotating cage is a standardized methodology for investigating the corrosion of metals under pipe flow conditions. Average corrosion rates are determined through mass loss, and the relatively large surface area of the specimens permits statistical analysis of localized corrosion phenomena, monitored through techniques such as laser profilometry. The shear stress of the moving fluid on the metal coupons is commonly used to relate experimental test conditions to those of flowing pipelines. This paper presents a parametric study of computational fluid dynamics simulations that investigated the dependence of the wall shear stress (both the area-weighted average and 90th percentile) on rotational velocity, fluid viscosity, and fluid density for the standardized rotating cage test apparatus. The conditions covered the full range of rotational speeds of the apparatus, over a wide range of pipeline fluids and operating temperatures. The parametric characterization of the rotating cage is presented in a single chart, like that of the Moody chart for pipe flows.
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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 | 0.001 | 0.002 |
| 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 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| 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".