十分発達した円管内流れにおける撹乱の影響

URI http://harp.lib.hiroshima-u.ac.jp/it-hiroshima/metadata/7139
ファイル
タイトル
十分発達した円管内流れにおける撹乱の影響
別タイトル
The Effect of Attached Manipulator Ring on a Fully Developed Turbulent Pipe Flow
著者
氏名 宇都宮 浩司
ヨミ ウツノミヤ コウジ
別名 Utsunomiya Kouji
氏名 西 茂夫
ヨミ ニシ シゲオ
別名 Nishi Shigeo
氏名 中西 助次
ヨミ ナカニシ スケツグ
別名 Nakanishi Suketsugu
氏名 大坂 英雄
ヨミ オオサカ ヒデオ
別名 Osaka Hideo
キーワード
Pipe Flow
Mean Velocity
Ring-Type Manipulator
Turbulent Flow
Relaxation Process
NDC
423.84
抄録

The response of a fully developed pipe flow to an attached ring-type manipulator with rectangular cross section was investigated by measuring the mean velocity profiles. The ring-type element has a height of 0.14 times the pipe radius and was positioned rigidly in a 99.8 mm diameter,smooth-walled,circular pipe in which air was flowing at Reynolds number of 6.2 x 10^4. The results indicated that the flow was significantly perturbed by the manipulator ring and the return of the flow to a self-preserving state without disturbance was achieved either at about 960 times the manipulator height or at about 67 times the pipe diameter. Furthermore,near the reattachment point,which was about 8.2 times the manipulator height from that tip,the mean velocity profile in the core region of the pipe was much more uniform and the velocity gradient was steeper near the wall than a fully developed turbulent flow,indicating enhanced mixing. The boundary layer characteristics,such as the skin friction coefficient and boundary layer thickness,were also altered in the streamwise direction upon a pulsewise disturbance.

掲載雑誌名
広島工業大学研究紀要
31
開始ページ
89
終了ページ
96
出版年月日
Feb-97
出版者
広島工業大学
ISSN
3851672
NCID
AN0021271X
本文言語
日本語
資料タイプ
紀要論文
著者版フラグ
出版社版
関連URL
旧URI
区分
it-hiroshima