Applicability of Nonuniformly Varying the Fin Density of Tandem Finned Cylinders as a Viable Vortex and Noise Suppression Technique
Bibliographic record
Abstract
Abstract This study investigates the use of nonuniform finned tubes in tandem arrangements with different spacing-to-average equivalent diameter ratios (L/Deq(avg)) to suppress flow-induced acoustic resonance. Particle image velocimetry (PIV) was used to visualize vortex development in the wake before and during acoustic resonance, while acoustic pressure measurements characterized the aeroacoustic response. Nonuniform finned tubes were found to weaken the vortex shedding process and reduce the sound pressure level (SPL) by 68% and 50% during flow-induced acoustic resonance at L/Deq(avg)=2.0 and 2.5, respectively. However, nonuniform finned tubes do not inhibit the instability of the shear layers within the gap, making them susceptible to acoustic resonance where the shear layer instability is the source of excitation. During acoustic resonance associated with the shear layer instability, highly discrete and well-organized vortex cores form in the gap and wake of both uniform and nonuniform finned tubes, producing similar SPLs to those generated by uniform finned tubes. The findings of this study indicate that varying the fin density along the cylinders can potentially be used to suppress acoustic resonance excitation in normal triangle and rotated square tube arrays where vortex shedding is the main source of excitation at L/Deq(avg)≤2.5.
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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 | 0.001 | 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 | 0.000 |
| 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".