Open Balance Point and Dry Pressure Drop of a Rectangular Float Valve Tray: Experiment and CFD Simulation
Bibliographic record
Abstract
The open balance point (OBP) is the critical gas load at which the float valve tray transitions into or out of the all-open state, playing essential roles in pressure drop characteristics and engineering design. Its prediction is a typical fluid–solid interaction problem. A rectangular float valve tray’s Φ796 mm cold-model experiments demonstrated dry pressure drop and OBP differences between different gas-load-adjusting conditions (ascending or descending), leading to subsequent scaled-down experiments and numerical simulations. For the first time, the valve tray’s OBPs were predicted by numerical simulations, using the lattice Boltzmann method. The wall and adjacent valve effects positively influenced the opening of the valves, dry pressure drop, and vorticity above the tray deck. This study indicated that in multivalve systems, the valve with the highest partial gas load falls first as the gas load descends from the all-open state. Moreover, the difference in the OBP between the gas-load-ascending or gas-load-descending conditions is attributed to the synergistic effects arising from the frictional resistance between the valve legs and tray orifices in the inclined stationary state, along with the gas-load competition among the valves in the multivalve systems.
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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) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 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".