Effect of korteweg stress in miscible liquid two-layer flow in a microfluidic device

Y. Sugii, K. Okamoto, A. Hibara, M. Tokeshi, T. Kitamori

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


Miscible liquid two-layer flow in a Y-shaped microfluidic device, which consists of microchannels with 120 μm in width and 35 μm in depth, is investigated by particle image velocimetry (PIV) to clarify the flow characteristics at fluid interfaces. The obtained velocities with a spatial resolution of 5.9 × 1.5 μm-2 around the interface between water and ethanol indicate an imbalance in shear stress at interface. The reason of the imbalance is to be the Korteweg stress generated by interfacial tension gradient due to a concentration gradient by diffusion in a miscible two-layer flow. The stress may cause an interfacial instability and destroy a uniform mixing in two flowing fluids in the case of large concentration gradient.

Original languageEnglish
Pages (from-to)117-124
Number of pages8
JournalJournal of Visualization
Issue number2
Publication statusPublished - 2005
Externally publishedYes


  • Continuous flow chemical processing
  • Interfacial tension
  • Korteweg stress
  • Micro PIV
  • Miscible liquid flow

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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