Pneumatic Transportation with Low Touching Pipe Wall Using Spiral Flow.

• UEDA Hiroshi

  大鵬薬品工業 (株) 生産センター品質管理部

• TAKEI Masahiro

  日本大学理工学部機械工学科

• ZHAO Yao-Hua

  東京大学生産技術研究所

• LI Hui

  鹿児島大学工学部機械工学科

• OCHI Mitsuaki

  日本大学理工学部機械工学科

• TOMITA Yuji

  九州工業大学工学部設計生産工学科

• HORII Kiyoshi

  白百合女子大学共通科目

Bibliographic Information

Other Title

• 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
• スパイラル フロー オ モチイタ カン ナイヘキ エ ノ テイ セッショクカ

Abstract

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.

Journal

• Aeronautical and Space Sciences Japan

  Aeronautical and Space Sciences Japan 46 (534), 393-397, 1998

  THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES

Keywords

• Pneumatic Transportation
• Low Pressure Drop
• Low-Touching Transportation
• Spiral Flow
• Swirling Flow
• Particle Rotation

Details

• CRID: 1390001204479622528
• NII Article ID: 10002862942
• NII Article ID: 10007650069
• NII Book ID: AN00189072
• DOI: 10.2322/jjsass1969.46.393
• ISSN: 24241369
• ISSN: 00214663
• ISSN: http://id.crossref.org/issn/00214663
• NDL BIB ID: 4522489
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4522489
• Web Site: https://www.jstage.jst.go.jp/article/jjsass1969/46/534/46_534_393/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed