PERIODIC CHARACTERISTICS OF LAMINAR DEVELOPING FLOW THROUGH A HORIZONTAL TUBE SUBJECT TO RADIAL OSCILLATIONS
Bibliographic record
Abstract
This paper presents a numerical study of periodic, developing, laminar, incompressible flow in a straight horizontal tube subject to low frequency oscillations about the vertical diameter at its entrance. The three-dimensional flow field is influenced by the tangential and Coriolis forces and is governed by three independent parameters: the flow Reynolds number Re, the oscillation Reynolds number Reω (based on the tub’s oscillation frequency ω) and the angular amplitude A of the tube’s oscillation. It is characterized by a periodic secondary transverse flow, normally consisting of two symmetrical vortices, and an oscillating axial field. The local friction factor exhibits large variations along the tube;s circumference. Its average value is higher than the corresponding value for stationary tubes, and increases with both Reω and A. At high Reω the tube’s oscillation can induce flow reversal, the limits of this flow reversal have been established in terms of the three governing parameters. Finally, the existence of an oscillating developed flow region has been established.
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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 | 0.000 | 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".