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vitesse de l’écoulement libre

English translation: free stream velocity

14:12 May 25, 2014
French to English translations [PRO]
Tech/Engineering - Aerospace / Aviation / Space / inverseur de poussée
French term or phrase: vitesse de l’écoulement libre
Hi,

"Comme cela est connu en soi, une telle couche limite est une zone dans laquelle les profils de vitesses passent de 0 sur la paroi de l'extrados à la vitesse de l'écoulement libre à une certaine distance de cet extrados.
Comme cela est connu en soi, cette distance dépend de nombreux paramètres, parmi lesquels la viscosité du fluide considéré (de l'air dans le cas présent)."

free-flowing speed??
Thank you
Louisa Tchaicha
Tunisia
Local time: 09:44
English translation:free stream velocity
Explanation:
The mean speed of any boundary layer starts at zero right on the surface. It then rapidly increases until it reaches (asymptotically, or very nearly) the "free-stream" velocity of the fluid well away from and outside the influence of the boundary layer.

--------------------------------------------------
Note added at 1 hr (2014-05-25 15:30:20 GMT)
--------------------------------------------------

See para. 1: http://en.wikipedia.org/wiki/Boundary-layer_thickness
"This page describes some parameters used to measure the properties of boundary layers. Consider a stationary body with a turbulent flow moving around it, like the semi-infinite flat plate with air flowing over the top of the plate. At the solid walls of the body the fluid satisfies a no-slip boundary condition and has zero velocity, but as you move away from the wall, the velocity of the flow asymptotically approaches the **free stream mean velocity**. Therefore it is impossible to define a sharp point at which the boundary layer becomes the free stream, yet this layer has a well-defined characteristic thickness. The parameters below provide a useful definition of this characteristic, measurable thickness."
Selected response from:

chris collister
France
Local time: 10:44
Grading comment
Thank you!
4 KudoZ points were awarded for this answer



Summary of answers provided
4 +2free stream velocity
chris collister


  

Answers


1 hr   confidence: Answerer confidence 4/5Answerer confidence 4/5 peer agreement (net): +2
free stream velocity


Explanation:
The mean speed of any boundary layer starts at zero right on the surface. It then rapidly increases until it reaches (asymptotically, or very nearly) the "free-stream" velocity of the fluid well away from and outside the influence of the boundary layer.

--------------------------------------------------
Note added at 1 hr (2014-05-25 15:30:20 GMT)
--------------------------------------------------

See para. 1: http://en.wikipedia.org/wiki/Boundary-layer_thickness
"This page describes some parameters used to measure the properties of boundary layers. Consider a stationary body with a turbulent flow moving around it, like the semi-infinite flat plate with air flowing over the top of the plate. At the solid walls of the body the fluid satisfies a no-slip boundary condition and has zero velocity, but as you move away from the wall, the velocity of the flow asymptotically approaches the **free stream mean velocity**. Therefore it is impossible to define a sharp point at which the boundary layer becomes the free stream, yet this layer has a well-defined characteristic thickness. The parameters below provide a useful definition of this characteristic, measurable thickness."

chris collister
France
Local time: 10:44
Specializes in field
Native speaker of: Native in EnglishEnglish
PRO pts in category: 110
Grading comment
Thank you!
Notes to answerer
Asker: Thank you!


Peer comments on this answer (and responses from the answerer)
agree  merlrennes
51 mins
  -> Thanks!
agree  Anca Florescu-Mitchell
1 hr
  -> Thanks, Anca
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