Laminar flow instability in a rectangular channel with a cylindrical core
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Bibliographic record
Abstract
Experiments in laminar flow in a rectangular channel containing a cylindrical rod have revealed a flow instability in the form of weak pulsations across the gap between the rod and the channel wall. The instability occurs when the Reynolds number reaches a critical value, which increases as the gap diminishes. As the Reynolds number is increased, the pulsations become stronger and develop, first into hairpin-shaped patterns, then into quasiperiodic laminar vortices, which alternate on either side of the gap. Eventually, the flow becomes turbulent, albeit preserving a quasiperiodic vortical structure. Within the present experimental range, the Strouhal number of the pulsations increases with increasing Reynolds number. The instability process is discussed in the context of previous analyses of low-speed streak instability of wall-bounded flows and transition to turbulence.
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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