Parametric Wall Shear Stress Characterization of the Rotating Cage Test Method
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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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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