The Effect of Transverse Tube Motion on the Unsteady Fluid Forces in a Normal Triangle Tube Array
Bibliographic record
Abstract
Previous research work (Ricciardi et al [1] ) conducted on a normal triangular tube bundle subjected to two-phase flow in the transverse direction, over a range of void fractions, showed that tubes vibrated with large amplitudes as flow velocity increased. The vibration behavior was found to be strongly dependent on void fraction for this tube array geometry. For void fractions up to 40% classical fluidelastic instability was observed. Near 50%-60% void fraction, fluidelastic instability was preceded what was proposed to be strong flow-periodicity induced vibrations. For high void fractions (>70%), the tube array undergoes apparent fluidelastic instability followed by near complete restabilization at high flow velocities. The present work investigating the stability behavior of the normal triangular array through a detailed experimental test program to determine the fluidelastic forces for a range of void fractions. The dynamic forces are measured with strain gage mounted on the tubes. The geometry of the array is as the following; The P/D is 1.5, and the tube diameter D is 38 mm. The forces are measured at high velocities and void fractions. The results are compared with those obtained in the rotated triangular tube bundle. A comprehensive study is carried out in order to have an understanding of the physics of the two-phase flow and its behavior within the normal triangular tube array. The dynamic forces associated with the flow analyzed in detail and stabilization behavior clarified. 1)Ricciardi, G., Pettigrew, M. J., & Mureithi, N. W. (2011). Fluidelastic Instability in a Normal Triangular Tube Bundle Subjected to Air-Water Cross-Flow. Journal of pressure vessel technology, 133(6), 061301.
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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".