スパイラルフローを用いた管内壁への低接触化空気輸送 Pneumatic Transportation with Low Touching Pipe Wall Using Spiral Flow

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A transportation system with low pressure drop using spiral flow has been developed. With this system, ceramic balls were transported at the rate of 190kg/h in a 15.0m long pipeline that was composed of a 5.0m vertical section and a 10.0m horizontal section with 34.0mm diameter. The pressure drop was dramatically decreased by about 40% from 6.91×102 [Pa/m] to 3.88×102 [Pa/m] as compared with the typical method. The particles movement was observed at the vertical section to discuss the low pressure loss. The particles moved as rotating without touching the inner pipe wall. The device to produce spiral flow is a nozzle with an annular slit, attaching to the conical cylinder. Pressurized fluid is forced through the side of the device into the buffer area and then through the angled annular slit into the conical cylinder. Due to the Coanda effect of this annular jet attaching to the nozzle wall, the flow downstream develops a spiral structure with steep axial velocity distribution and high stability that is much more ordered than typical turbulent flow. To accomplish the high performance transportation, particles should not touch the pipe inner wall. The requirements can be responded by the steep axial velocity profile and swirling motion of the spiral flow with large free vortex region.

収録刊行物

  • 日本航空宇宙学会誌 = Journal of the Japan Society for Aeronautical and Space Sciences  

    日本航空宇宙学会誌 = Journal of the Japan Society for Aeronautical and Space Sciences 46(534), 393-397, 1998-07 

    一般社団法人 日本航空宇宙学会

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各種コード

  • NII論文ID(NAID)
    10002862942
  • NII書誌ID(NCID)
    AN00189072
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    00214663
  • NDL 記事登録ID
    4522489
  • NDL 雑誌分類
    ZN25(科学技術--運輸工学--航空機・ロケット)
  • NDL 請求記号
    Z16-436
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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