New Impeller for Viscous Fermentation: Power Input and Mass Transfer Coefficient Correlations
Bibliographic record
Abstract
To mix viscous fermentation broths more efficiently, a new close-clearance impeller, the rotational reciprocating plate impeller (RRPI), was designed to partly mimic the axial reciprocating plate impeller (ARPI). Akin to the axial movement of a reciprocating plate impeller, this new RRPI rotates back and forth driven by a three-arm linkage system. Its power consumption and overall mass transfer coefficient ( K L a ) were determined in a 22 L laboratory scale bioreactor using model fluids of different viscosities. Results obtained with this new impeller were compared to those of a triple Rushton impeller (TRI) and an ARPI. In water, results were the same as those of the TRI. However, the ARPI gave significantly lower K L a than the other two impellers for the same power input per unit volume. In highly viscous non-Newtonian carboxymethyl cellulose (CMC) solutions, the new impeller showed similar performance as the ARPI, whereas the TRI was not able to provide acceptable mixing due to the presence of stagnant zones. Therefore, this new impeller proves to be a suitable alternative to existing impellers for use in fermentations having rheologically evolving broth.
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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 | 0.001 |
| 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".