332 マイクロ回転体によるステップチャンネルフロー内の混合効率の研究(T06-2 マイクロ・ナノ熟流体システム(2) マイクロフルイディクス,大会テーマセッション,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

概要

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Mixing performance of an active mixer which mixes two fluids without diffusion by three-dimensional flow surrounding a rotating shuttlecock rotor in continuous mixer is numerically investigated. The mixer consists of a step contraction-expansion microchannel and a shuttlecock micro-rotor placed in the step. The obtained results show that the effects of mean velocity and rotation speed are resulted in the effect of Strouhal number. Streaklines demonstrate that two fluids from the inlet can penetrate into the space between the paddles of the rotor, and then are mixed here before flowing to the exit channel. Two fluids are twisted 90 degrees after passing the rotor region. It implies that mixing in downstream flow behind the rotor takes place in the height instead of the width of the exit channel, which makes the mixer applicable for channels with high aspect ratio of the cross section. It is observed that mixing is dominantly enhanced in the rotor region and increasing Strouhal number results in faster mixing in the mixer.
一般社団法人日本機械学会の論文
2008-08-02