Correlation and Prediction of Solids Holdups of Gas-Solid Two-Phase Flow in Fully Developed Region of CFB Risers
Bibliographic record
Abstract
To investigate the solids holdups in fully developed region of CFB risers, experiments were carried out in two CFB risers with the heights of 15.1m and 10.5m, respectively. FCC particles (Geldart A) and sand particles (Geldart B) were used in the experiments and the solids holdups were calculated by using measured pressure gradients. The experimental results obtained from 175 sets of operation conditions, under which the lengths of fully developed section are longer than 2.8 m, show that when the superficial gas velocity is between 3 m?s?1 and 8 m?s?1, it has a significant effect on the variations of the average solids holdups in fully developed region with the terminal solids holdups, but when it is less than 3 m?s-1 or greater than 8 m?s-1, the effect becomes inapprecible and the average solids holdups vary linearly with the terminal solids holdups. By taking into account the effects of superficial gas velocity, particle properties and riser geometry, a new empirical correlation for the average solids holdups in fully developed region of CFB riser were developed, which is in good agreement with the experimental data of this work and accords with the correlations reported in literatures
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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 | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 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 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".