File:Cf laminaire ou turbulent plaque plane.png
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Summary
[edit]DescriptionCf laminaire ou turbulent plaque plane.png |
Français : Coefficient de friction Cf créé par les Couches Limites Laminaire et Turbulente sur la plaque plane, avec trois courbes de transition lorsque la Couche Limite effectue sa transition du régime laminaire vers le régime turbulent.
English: Friction coefficient Cf created by the Laminar and Turbulent Boundary Layers on the flat plate, with three transition curves when the Boundary Layer transits from the laminar to the turbulent regime. |
Date | |
Source | Own work |
Author | Bernard de Go Mars |
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Annotations InfoField | This image is annotated: View the annotations at Commons |
La ligne de Schoenherr, déterminée expérimentalement, peut être tracée par une fonction inverse Re = f(Cf). Ceci étant, la fonction directe d'Hama la représente assez fidèlement.
On note que pour les faibles Reynolds longitudinaux, les régressions en puissance s'écartent de la ligne de Schoenherr.
Le donné ici vaut pour un seul côté de la plaque plane. C'est de bonne ingénierie dans la mesure où les corps le plus courant (les navires, les aéronefs, les véhicules routiers, etc.) ne présentent qu'une seule surface de friction (leur surface extérieure, souvent nommé surface mouillée).
Si par contre l'on traîne une plaque plane et mince dans l'eau (une tôle, par exemple), il faudra prendre comme surface de friction les deux côtés de cette plaque.
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current | 10:52, 7 July 2019 | 822 × 559 (36 KB) | Bernard de Go Mars (talk | contribs) | User created page with UploadWizard |
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Horizontal resolution | 37.79 dpc |
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Vertical resolution | 37.79 dpc |