Self-Excited Oscillations of Wiping Air Knives, Part I: General Behavior and Fluid Loading on the Strip Sheet
Bibliographic record
Abstract
In the continuous hot dip galvanizing process, a high speed planar air jet is used at each side of the steel sheet substrate to control the thickness of zinc coating. The impingement of these jets on the moving steel sheet, after its immersion in a bath of molten zinc, forces the excess liquid zinc to be “wiped” back into the zinc bath through the combined effects of the pressure gradient and the shear stress distribution on the strip. In this first of a series of three papers, the air knives are shown to experience two different types of self-excited oscillations; one is due to the impingement of the planar jets on the steel strip while the second is associated with the impingement of the opposing planar jets on each other beyond the edges of the steel strip. Because of the difficulty involved in measuring the fluid forces on the strip, a large scale model of a planar jet impinging on a plate is designed with the ability to control the jet oscillation by means of synthetic jets focused on the jet exit. Measurements of the fluid forces on the impingement plate in the presence and in the absence of jet oscillation will be presented; including the steady and unsteady pressure profiles as well as the skin friction distributions. The other two parts of this series of papers address passive methods to suppress the excitation mechanisms caused by the jet impingement on the strip and the impingement of the opposing planar jets.
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How this classification was reachedexpand
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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".