マイクロ流体デバイス内混相流れの共焦点マイクロPIVによる可視化計測

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  • Confocal Micro-PIV Measurement of Micro- Multiphase Flow in The Microfluidic Devices
  • マイクロ リュウタイ デバイス ナイ コンソウリュウレ ノ キョウ ショウテン マイクロ PIV ニ ヨル カシカ ケイソク

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This paper presents a micro-multiphase flow measurement technique using ‘multicolour confocal micro-particle image velocimetry (PIV)’ by wavelength separation technique. The present system can measure the dynamic interaction between flows in two different phases, such as liquid-liquid or solid-liquid, simultaneously and separately. The system has high temporal resolution up to 2000 frames per second, and high spatial resolution up to 0.116 μm/pixel in plane and 0.58μm out of plane, which is enough to resolve cell size measurement target.<BR>　In this paper, three measurement demonstrations are shown. There are flow inside and outside of moving microdroplet, droplet formation at T-shaped junction and red blood cells (RBCs) dispersed flow. The droplet is studied as a liquid-liquid multiphase flow using immiscible two liquids of oil and water. This study clarifies not only three-dimensional flow structure using continuity equation-assisted method, but also shear force between its interface. These informations are necessary for estimation of mixing effect using circulation in the droplet and discussion on droplet formation mechanism.<BR>　The measurement of RBCs mixed flow requires more due to its unsteadiness and randomness derives from characteristics of live cells. Our developed ‘Target-tracking system’ can measure one individual cell for long time under the high-magnification measurement condition. Finally the tank-treading motion of RBC and the surrounding flow structure simultaneously for the investigation of specific behavior of RBC.

収録刊行物

  • 混相流

    混相流 28 (2), 183-192, 2014

    日本混相流学会

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