The Effect of Wire Shape on the Flow Through Narrow Apertures in a Pulp Screen Cylinder
Bibliographic record
Abstract
Turbulent flow over a rough surface with suction or blowing is a common fluid mechanics problem that has many practical applications including pulp screening. The present study is motivated by the optimization of aperture geometry in pulp screens used in the pulp and paper industry to separate unwanted contaminants from pulp fibres. In these devices, a dilute suspension of fibres is forced through fine slots to remove the oversized contaminants. To better understand the complex hydrodynamics at the critical region near the screen surface, a Computational Fluid Dynamics study has been conducted to examine how the geometry of the aperture entry, characterized by contour height and wire width, affect the details of the flow field. The results indicate that the flow is dominated by a separation vortex that covers the aperture. For low contour heights the flow is accelerated upstream of the aperture due to the high vorticity at the aperture entry and as profile height increases the turbulence intensity at the screen cylinder surface increases. Although the wire width has less of a impact on the flow field than contour height, the results show that decreasing wire width increases turbulence intensity at the surface due to a increase in apparent roughness of the cylinder.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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".