Investigating the apparent anomalous cooling of soot during laser-induced incandescence experiments
Bibliographic record
Abstract
Abstract While time-resolved laser-induced incandescence (TiRe-LII) has become a standard laser-based diagnostic for soot, there remain unexplained observations in some datasets. One such effect is the so-called “anomalous cooling”, in which the pyrometric temperature decays faster than can be explained by conventional heat transfer models immediately following the peak temperature. This work investigates this phenomenon through experiments on soot entrained in different bath gases and irradiated in the low-fluence regime, where particle sublimation is minimal. The anomalous cooling phenomenon is caused by the contribution of particles in the probe volume that have been heated beyond the sublimation threshold to the overall incandescence signal, due to nonuniform laser fluence. Particles in these “hot spot” regions feature a faster cooling rate due to sublimation, contributing to the effect of apparent anomalous cooling. Particle-size polydispersity also plays a notable but minor role. The effect depends on the bath-gas composition, which is attributed to differences in species-specific heat transfer.
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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".