| Item type |
文献 / Documents(1) |
| 公開日 |
2024-06-18 |
| アクセス権 |
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アクセス権 |
open access |
| 資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
|
資源タイプ |
journal article |
| 出版社版DOI |
|
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|
識別子タイプ |
DOI |
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関連識別子 |
https://doi.org/10.1299/jfst.8.436 |
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言語 |
ja |
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|
関連名称 |
10.1299/jfst.8.436 |
| 出版タイプ |
|
|
出版タイプ |
AM |
|
出版タイプResource |
http://purl.org/coar/version/c_ab4af688f83e57aa |
| タイトル |
|
|
タイトル |
Laminar-Turbulent Transition of an Inlet Boundary Layer in a Circular Pipe Induced by Periodic Injection (Shape of Isolated Turbulent Patches and Their Growth) |
|
言語 |
en |
| 著者 |
一宮, 昌司
マツダイラ, ハヤト
フジムラ, ハヤト
オオノ, ヒデキ
|
| 抄録 |
|
|
内容記述タイプ |
Abstract |
|
内容記述 |
The laminar-turbulent transition of a boundary layer induced by a jet injection in the inlet region of a circular pipe was experimentally investigated. The jet was periodically injected radially from a small hole in the inlet region into the pipe flow. Axial velocity was measured by a hot-wire anemometer. The turbulence induced by the jet within the boundary layer developed into turbulent patches which then grew in the axial, circumferential and radial directions downstream. The shape of the patches shown by the intermittency factor in the diametrical plane was similar to the turbulent spot in the flat plate boundary layer at first, then became similar to the turbulent slug in the pipe flow developed downstream. The turbulent patches protruded from the boundary layer after they grew and reached the circumferential opposite side, although they stayed within the boundary layer as long as the shape was turbulent spot-like in the diametrical plane. The propagation velocity at the leading edge became faster than the cross-sectional velocity, though it turned slower at the trailing edge. Therefore, the growth rate of its axial length varied downstream. The growth rate of the patches' circumferential length was smaller than that in the turbulent spot under zero pressure gradient and was almost the same as the spot under favorable pressure gradient. |
|
言語 |
en |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Pipe Flow |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Transition |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Boundary Layer |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Turbulence |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Inlet Region |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Isolated Turbulent Patch |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Propagation Velocity |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Turbulent Spot |
| 書誌情報 |
en : Journal of Fluid Science and Technology
巻 8,
号 3,
p. 436-451,
発行日 2013
|
| 収録物ID |
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|
収録物識別子タイプ |
ISSN |
|
収録物識別子 |
18805558 |
| 出版者 |
|
|
出版者 |
日本機械学会 |
|
言語 |
ja |
| EID |
|
|
識別子 |
273812 |
|
識別子タイプ |
URI |
| 言語 |
|
|
言語 |
eng |
jfst_8_3_436.pdf (1.37 MB)
