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文献详情 >OPTICAL TELEPHONE CORD PASSING... 收藏

OPTICAL TELEPHONE CORD PASSING THROUGH LONG PIPE WITH SPIRAL FLOW

OPTICAL TELEPHONE CORD PASSING THROUGH LONG PIPE WITH SPIRAL FLOW

作     者:K.Horii Y.Matsumae Cheng Xiaoming M.Takei E.Yasukawa B.Hashimoto 

作者机构:Shirnyuri Women's College 1-25 Midorigaoka Chofu-shi Tokyo 182 JAPANShirnyuri Women's College 1-25 Midorigaoka Chofu-shi Tokyo 182 JAPANShirnyuri Women's College 1-25 Midorigaoka Chofu-shi Tokyo 182 JAPANShirnyuri Women's College 1-25 Midorigaoka Chofu-shi Tokyo 182 JAPANShirnyuri Women's College 1-25 Midorigaoka Chofu-shi Tokyo 182 JAPANShirnyuri Women's College 1-25 Midorigaoka Chofu-shi Tokyo 182 JAPAN 

出 版 物:《Chinese Journal of Aeronautics》 (中国航空学报(英文版))

年 卷 期:1991年第6卷第2期

页      面:133-140页

核心收录:

学科分类:08[工学] 0825[工学-航空宇航科学与技术] 

主  题:PIPE OPTICAL TELEPHONE CORD PASSING THROUGH LONG PIPE WITH SPIRAL FLOW 

摘      要:A new effective technique, useful in telecommunications industry for passing an optical telephone cord attached to a connector through pipeline,has been developed using the spiral flow. Using this technique, the cord could be passed through a straight pipeline 150 meters long and a roll of vinyl tube 50 meters long. However, under the same condition, the cord could not pass through when using the turbulent flow. To obtain a high speed stable spiral flow, a nozzle with an annular slit connected to a conical cylinder was used. A pressurized fluid with no tangential flow was supplied through this slit and the fluid, passing through the conical cylinder, was deformed into spiral flow with the steeper axial velocity distribution compared to that of turbulence pipe flow due to Coanda effect and instability. As a result, the cord was attracted to the axis area of the pipe, which effectively increased the ability for the work of cord passing. This high ability for cord passing is attributed mainly to the reduction of the friction made between the cord and the pipe wall, caused by the deformation to spiral flow.

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