Heat Transfer Between Gas-Solid Phases Within Packed Particle Beds
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Bibliographic record
Abstract
Abstract A new method is presented to determine the internal heat convection coefficients for air flowing steadily through a bed of spherical particles. In this technique, a series of step change experiments are carried out on beds of glass beads of different diameters that are subjected to a temperature step change in the inlet airflow at different flow rates. Thermocouples are arranged along the particle bed height to record the particle temperature distribution and inlet/outlet air temperatures at any time. A theoretical energy analysis of particle beds to determine the convective heat transfer coefficients is performed for the short time duration when the experimental data show that temperature distribution along the airflow direction at any time is almost spatially linear and the temperature at any specific position is almost temporally linear. The energy change of the particle beds within this time duration is shown to be a function of the heat convection coefficient. Therefore, a new correlation, in terms of Nusselt number versus Reynolds number (, with uncertainty limits at 95% confidence level, is developed and found to be in good agreement with most other correlations developed by other researchers for beds of similar spherical particles. Keywords: convection coefficientNusselt numberReynolds numberspherical particlestep changetemperature distributiontheoretical model Acknowledgments This work was supported by Discovery Grants from the Natural Sciences and Engineering Research Council of Canada (NSERC).
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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 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| 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 it