Study of Hydrodynamics, Mixing and Gas-Liquid Mass Transfer in a Split-Rectangular Airlift Reactor
Bibliographic record
Abstract
Global hydrodynamic characteristics, liquid mixing and gas-liquid mass transfer for a 63 L split-rectangular airlift reactor were studied. Correlations for gas holdup and overall liquid circulation velocity were derived for the air-water system as a function of the specific power input; these were compared to data and correlations for reactor volumes between 4.7 L and 4600 L. A partial recirculation of small bubbles in the riser was observed when Ugr > 0.03 m/s, which was attributed to the use of a single-orifice nozzle as the gas phase distributor. The dimensionless mixing time and the overall axial dispersion coefficient were nearly constant for the range of gas flow rates studied. However, values of KL/dB were greater than those reported in previous studies and this is caused by the partial recirculation of the gas phase in the riser. While scale effects remain slight, the use of a gas distributor favouring this partial recirculation seems adequate for mass transfer in split-rectangular airlift reactors. On a étudié les caractéristiques hydrodynamiques globales, le mélange de liquide et le transfert de matière gaz-liquide pour un réacteur à air ascendant rectangulaire divisé. Des corrélations pour la rétention de gaz et la vitesse de circulation de liquide globale ont été calculées pour le système air-eau en fonction de la puissance spécifique; ces corrélations ont été comparées aux données ainsi qu'à des corrélations pour des volumes de réacteur compris entre 4,7 L et 4600 L. Une recirculation partielle des petites bulles dans la colonne montante a été observée quand Ugr > 0,03 m/s, qui est attribuée à l'utilisation d'un seul orifice pour la distribution de la phase gazeuse. Le temps de mélange adimensionnel et le coefficient de dispersion axiale globale sont presque constants dans la gamme de débits de gaz étudiés. Toutefois, les valeurs de KL/dB sont plus grandes que celles des études antérieures, en raison de la recirculation partielle de la phase gazeuse dans la colonne montante. Tandis que les effets d'échelle demeurent légers, l'utilisation d'un distributeur de gaz favorisant cette recirculation partielle semble adéquate pour le transfert de matière dans les réacteurs à air ascendant rectangulaire divisés.
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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".