Instability of a Simply-Supported Cylinder Subjected to Annular Flow Over a Finite-Length at its Mid-Length
Bibliographic record
Abstract
A few analytical models for a simply-supported cylinder subjected to a concentric annular flow have been developed considering small perturbations in the flow components. The flow perturbation is believed to play a key role in causing instabilities or reducing the effective tube damping. However, it is generally accepted that there is no dynamic instability of a simply-supported cylinder subjected to concentric annular flows; the dynamic instability may materialize only with a very flexible rod where traveling wave solutions are expected. The dynamic behavior of a concentric annular flow in a finite-length-narrow gap at the mid-span of a cylinder is studied to investigate the possibility of a dynamic instability in the case of a simply-supported cylinder. In this study, typically used stainless steel tubing and geometry in engineering application are applied with some fluid boundary conditions at the finite-length-narrow gap such as a contraction entrance and a diffuser exit. The research results from this study are as follows: (1) determination of an analytical solution for tube dynamics in terms of fluid boundary conditions such as contraction loss at the entrance and pressure recovery at the exit of the finite-length-annular gap, (2) confirmation of the effect of leakage-flow to system dynamics, and (3) confirmation of flutter instability (negative damping type) at the fluid boundary conditions.
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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 | 0.001 |
| 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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".