Flow and Heat Transfer Within Segregated Beds of Solid Particles
Bibliographic record
Abstract
A model for the transient fluid flow and heat transfer within an axially symmetrical circular cylindrical packed bed of solids containing two different layers of porous matrices is described. The system relates to a cylindrical packed bed fitted with an axial core of a porous matrix that is different from the surrounding cylindrical shell. The influence of permeability ratio (0.0625−16) and Reynolds number (1000 and 2000) on the thermal wave propagation is described. A hot stream of dry air is forced to flow axially at the inlet to the bed. The numerically predicted results are validated against experimental data obtained in a small laboratory test rig 63 mm in diameter and 120 mm in length that is packed with uniform diameter spherical glass beads (3−12 mm in diameter). An analytical model was also developed to estimate the velocity in the bed and compared with the value obtained from the numerical solution of the volume-averaged Navier-Stokes equation. The results are presented for Reynolds numbers of 1000 and 2000. It is found that for a highly fractured core, the heat diffuses radially, while for a low permeability core the heat transfer takes place by advection and diffusion. In the latter case, the Reynolds number has a significant effect on the rate of heat transfer.
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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) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 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".