A Study of Intermittent Buoyancy Induced Flow Phenomena in CANDU Fuel Channels
Bibliographic record
Abstract
The present work focuses on the study of two-phase flow behavior called “Intermittent\nBuoyancy Induced Flow” (IBIF) resulting from the loss of coolant circulation in a\nCANDU nuclear reactor core. The main objectives are to study steam bubble formation\nand migration through the pressure tube and into the feeder tubes and headers, and to\nstudy the effect of pressure tube sagging on the two-phase flow behavior during IBIF.\nExperiments are conducted using air and water flow at atmospheric pressure to\nqualitatively examine the IBIF phenomena. The test showed oscillating periodic behavior\nin the void fraction as the air vents.\nIn addition to this, a mathematical model based on a simplified momentum balance for the\nliquid and gas phases was formulated. The model was further solved and compared to the\nexperimental data. The model predictions showed a reasonable agreement within the\ninvestigated range of void fractions.
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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 | 0.000 |
| 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 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".