Shape of the Liquid-Liquid Interface in Micro Counter-Current Flows

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  • AOTA Arata
    Institute of Microchemical Technology Co., Ltd.
  • HIBARA Akihide
    Institute of Industrial Science, The University of Tokyo
  • SUGII Yasuhiko
    Department of Applied Chemistry, School of Engineering, The University of Tokyo
  • KITAMORI Takehiko
    Department of Applied Chemistry, School of Engineering, The University of Tokyo

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We investigated the shape of the liquid–liquid interface in micro counter-current flows formed within microchannels. The pressure balance at the interface was calculated based on the interface geometry. Although the shape should be an arc under laminar flow, a large deformation near the center of the microchannel was observed. In the center of the microchannel, Laplace pressure (171 – 450 Pa) was induced toward the aqueous phase. In contrast, near both sidewalls, Laplace pressure (81 – 166 Pa) was induced toward the organic phase. This result suggests that opposing flow occurs in the adjacent phases near the interface, with spiral-like flow generation.

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