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2007 Fiscal Year Final Research Report Summary

Analysis of flow-induced structure of polynieric fluid in a miatchannel for processing of nano composite materials

Research Project

Project/Area Number 18560667
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Composite materials/Physical properties
Research InstitutionOsaka University

Principal Investigator

YASUDA Kazunori  Osaka University, Graduate School of Engineering, Assistant Professor (80239756)

Project Period (FY) 2006 – 2007
Keywordscomplex fluid / micro flow / flow around a circular obstacle / birefringence / orientation angle / non-Newtonian fluid / flow -induced structure / elongational flow
Research Abstract

Flow-induced structure of polymer solutions has been estimated quantitatively around a small circular obstacle in a small channel, which has a 4 mm width and 1 mm depth. We made an original optical system to measure the birefringence of the test liquid, which corresponds to the change of the structure at a high resolution in a space of 0.1 mm step. Furthermore, we measured velocity distributions in the flow channel. As a result, in the upstream of the obstacle, the degree of molecular orientation decreases as the fluid particle flows towards the obstacle because the molecular orientation is aligned in the direction perpendicular to the flow due to the decelerating flow. Just upstream the obstacle, however, the degree of molecular orientation became large because the orientation is almost perfectly aligned in the direction perpendicular to the flow. On the other hand, in the downstream of the obstacle, the degree of molecular orientation became large as the fluid flows in the direction of the downstream due to the elongational flow. These measurements were carried out in a very small region in a channel space.
Next, we measured the flow pattern and the velocity distribution in the flow of nano fiber suspension made of bacteria cellulose (BC fluid). The flow was visualized in the channel having rectangular cross section and a 4: 1 contraction. The velocity profile of the Newtonian fluid had a parabolic-like flow, but a plug-like flow in a BC fluid. The larger concentration of the BC became more plug-like velocity profile, because the BC fluid has a shear-thinning viscosity. Furthermore, we measured the vortex enhancement in the reentrant corner at the contraction. As a result, the vortex in the BC fluid became larger than that in a Newtonian fluid. This is because the BC fluid has a large elongational viscosity.

  • Research Products

    (6 results)

All 2007 2006

All Presentation (6 results)

  • [Presentation] 微小領域における流動複屈折の測定2007

    • Author(s)
      村上玄明, 保田和則
    • Organizer
      日本レオロジー学会
    • Place of Presentation
      第55回レオロジー討論会(金沢大学)
    • Year and Date
      2007-11-01
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Measurement of flow-induced birefringence in a small region2007

    • Author(s)
      Noriaki, Murakami, Kazunori, Yasuda
    • Organizer
      the 55th annual meeting of the Society of Rheology, Japan
    • Place of Presentation
      Kanazawa University
    • Year and Date
      2007-11-01
    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] 高分子水溶液のマイクロチャネル内流れ2007

    • Author(s)
      山下敦史, 保田和則
    • Organizer
      日本機械学会
    • Place of Presentation
      2007年度年次大会(関西大学)
    • Year and Date
      2007-09-10
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Microflow of polymer solutions2007

    • Author(s)
      Atsushi, Yamashita, Kazunori, Yasuda
    • Organizer
      JSME annual meeting 2007
    • Place of Presentation
      Kansai University
    • Year and Date
      2007-09-10
    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] 複雑流体のマイクロチャネル内流れにおける速度分布計2006

    • Author(s)
      山下敦史, 保田和則
    • Organizer
      日本機械学会
    • Place of Presentation
      2006年度年次大会(熊本大学)
    • Year and Date
      2006-09-20
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Velocity measurements in flows of complex fluids through a microchannel2006

    • Author(s)
      Atsushi, Yamashita, Kazunori, Yasuda
    • Organizer
      JSME annual meeting 2006
    • Place of Presentation
      Kumamoto University
    • Year and Date
      2006-09-20
    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2010-02-04  

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