Investigation of LDPE blown film instability induced by air cooling
Bibliographic record
Abstract
Abstract This paper deals with the bubble instabilities induced by cooling airflow rate at different take‐up‐ratio (TUR) and blow‐up‐ratio (BUR) conditions in the film‐blowing process. Experimental methods to monitor the on‐site bubble instability included an in‐line scanning camera system to record the bubble oscillation and a manometer mounted on the die to measure the internal pressure corresponding to the radius variation. A good correlation between the bubble instability and the pressure inside the bubble has been obtained. Experimental results indicated that varying the cooling airflow rate at different TURs and BURs conditions produced significant differences in the dynamics of bubble instability. While a higher cooling air rate stabilized the bubble for a high BUR, the bubble was destabilized for a low BUR. The bubble with a high TUR sustained greater aerodynamics forces acting on the bubble surface, resulting in a broader operating range of stable operation. Finally, a numerical simulation using a RNG (renormalization group), k –ε model, and Fluent software was performed to analyze the effects of momentum and heat transfer from the cooling air to the polymer film on bubble instability. POLYM. ENG. SCI., 2008. © 2008 Society of Plastics Engineers
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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".