An experimental study of a plane turbulent wall jet using LDA
Bibliographic record
Abstract
An experimental investigation using laser Doppler anemometry was conducted of the mean flow characteristics of a turbulent wall jet on a smooth surface. The Reynolds number based on the slot height and exit velocity of the jet was Re ≈ 7,400. Measurements were carried out at downstream distances from the jet exit ranging from 20 to 80 slot heights. Conventional scaling, momentum-viscosity scaling and wall-jet similarity theory were used to analyze the streamwise evolution of the flow. Mean velocity profiles in both outer and inner coordinates are presented in this paper. Using conventional scaling, the mean velocity profiles were self-similar in the developed region of the jet and the jet spread rate was linear. Fitting to velocity profiles in inner coordinates indicated that use of a power law provides accurate and consistent estimates of the friction velocity in a plane turbulent wall jet. Both the spread rate and the maximum velocity decay were analyzed using different scaling laws. The power law constants in the present work differ from those in other studies which illustrates the sensitivity of the constants to the initial conditions. Skin friction coefficients in the present work showed good agreement with the results of other correlations and experimental studies.
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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".