Effects of Channel Length and Chevron Angle on Pressure Drop in the Entrance Region of Corrugated Rib Channels
Bibliographic record
Abstract
Abstract Plates with corrugated walls are used in plate heat exchangers for heat transfer enhancement usually at the expense of the fluid friction. In this paper, the effects of varying channel lengths and corrugation angles on the pressure drop in corrugated rib channels are examined. Water was used as the working fluid and the Reynolds number varied over the range 400 ≤ ReDe ≤ 2,500. The test fixture is constructed from aluminum and the plates core were machined with the same corrugation depth, 1.14 mm, but with different lengths, 10.16 cm and 20.32 cm and different corrugation inclination angles, 30°, 45°, and 60°. The hydraulic diameter of the formed channel is about 2.0 mm. Experimental results show that the friction factor for the short ribbed plates is significantly higher than those of the longer ribbed plates. In addition, the pressure drop increases with an increase of the corrugation angle for all ribbed plates tested. Based on the experimental results, correlations for predicting friction factor are proposed.
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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".