Critical Impeller Speed for Suspending Solids in Aerated Agitation Tanks
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Bibliographic record
Abstract
Abstract Systematic measurements have been carried out in agitated gas‐liquid‐solids systems to determine the just off‐bottom suspension speed. A variety of solids sizes, solids concentrations, impeller sizes and tank sizes are used. The difference between the just off‐bottom suspension speeds with and without gas sparging does not show a linear relationship with the gassing rate and the relation is system‐dependent. The relative just off‐bottom suspension speed RJSS = N jsg / N js is found to be dependent only on the just suspension aeration number N a js = Q g / N js D 3 and, for DT6 impellers, the relation is RJSS = 1 + mNa n js with the values of 2.6 and 0.7 for m and n , respectively. The relation is independent of the impeller size, solids size, solids loading and tank size, and can be used to scale up laboratory data to full‐scale mixing vessels. Data from different studies support the present findings.
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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)
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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 it