Aerodynamically smooth surface: Difference between revisions

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|Display title=aerodynamically smooth surface
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|Meaning=A surface with irregularities sufficiently small to be entirely embedded  in the [[laminar sublayer]].
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|Explanation=Thus, the smoothness of a surface will depend on the [[Reynolds number]]. The irregularities are  taken to be sufficiently dense and similar so that only the average height need be specified. A  surface is aerodynamically smooth if  <blockquote>[[File:ams2001glos-Ae13.gif|link=|center|ams2001glos-Ae13]]</blockquote> where ''u''<sub>&#x0002a;</sub> is [[friction velocity]], ''z''<sub>0</sub> is [[aerodynamic roughness length]], and &#x003bd; is the [[kinematic  viscosity]] of air. The critical [[Reynolds number]] is in the [[range]] of 2.5 &le; Re<sub>f</sub> &le; 70. <br/>''Compare''  [[aerodynamically rough surface]].
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== aerodynamically smooth surface ==
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<div class="definition"><div class="short_definition">A surface with irregularities sufficiently small to be entirely embedded  in the [[laminar sublayer]].</div><br/> <div class="paragraph">Thus, the smoothness of a surface will depend on the [[Reynolds number]]. The irregularities are  taken to be sufficiently dense and similar so that only the average height need be specified. A  surface is aerodynamically smooth if  <div class="display-formula"><blockquote>[[File:ams2001glos-Ae13.gif|link=|center|ams2001glos-Ae13]]</blockquote></div> where ''u''<sub>&#x0002a;</sub> is [[friction velocity]], ''z''<sub>0</sub> is [[aerodynamic roughness length]], and &#x003bd; is the [[kinematic  viscosity]] of air. The critical [[Reynolds number]] is in the [[range]] of 2.5 &le; Re<sub>f</sub> &le; 70. <br/>''Compare''  [[aerodynamically rough surface]].</div><br/> </div>
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Latest revision as of 22:02, 13 January 2024

A surface with irregularities sufficiently small to be entirely embedded in the laminar sublayer.
Thus, the smoothness of a surface will depend on the Reynolds number. The irregularities are taken to be sufficiently dense and similar so that only the average height need be specified. A surface is aerodynamically smooth if
ams2001glos-Ae13
where u* is friction velocity, z0 is aerodynamic roughness length, and ν is the kinematic viscosity of air. The critical Reynolds number is in the range of 2.5 ≤ Ref ≤ 70.
Compare aerodynamically rough surface.


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