INFLUENCE OF NOZZLE EXIT CONDITIONS ON THE NEAR-FIELD MEAN FLOW CHARACTERISTICS OF LOW-ASPECT-RATIO RECTANGULAR JETS
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Bibliographic record
Abstract
The present study reports a systematic investigation of the effect of aspect ratio and Reynolds number on the mixing characteristics of low-aspect-ratio rectangular jets issuing from orifice plate nozzles. The nozzle aspect ratio (AR) is varied from 2 to 7, while the Reynolds number (with a constant equivalent diameter) is varied from 1 × 104 to 5 × 104. Particle image velocimetry (PIV) is used to determine the jet centerline mean velocity decay, jet velocity half-width spread, and potential core length, which are used to characterize the mechanisms of jet spreading in the near (x/De < 4) and mid (4 < x/De < 10) fields. The results show a distinctive difference in the mixing characteristics in the very near field (x/De < 2) for the low-AR range (AR = 2−7) examined in the present study. Jet entrainment is found to decrease in the near field with increasing AR for AR < 5. For AR > 4, however, the trend is reversed, that is, jet entrainment increases with increasing AR. Additionally, the results show that, in the midfield, the magnitude of jet decay and spreading rates increases with increasing AR and remains relatively constant with varying Reynolds number. In conclusion, Reynolds number is found to have a lesser impact than the AR on the mixing characteristics of a rectangular jet, suggesting a stronger aspect ratio dependence for low-aspect-ratio rectangular jets.
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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 | 0.001 | 0.001 |
| 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 | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
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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