Abstract
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 x 1.5 μm2 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.
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Yasuhiko Sugii: He received his Ph.D. degree from Osaka Prefecture University in 2000. He worked in Kao Corporation from 1992 to 1995, and he was a post-doctoral fellow in Nuclear Engineering Research Laboratory, University of Tokyo from 2000 to 2002. He worked as a research associate in Nuclear Engineering Research Laboratory, University of Tokyo from 2002 to 2003 and University Illinois as a visiting scholar from 2003 to 2004. He works as a research associate in Department of Quantum Engineering and Systems Science, University of Tokyo since 2003. His research interests are in the image measurement of flow field, bio-fluid mechanics in blood flow and micro flow dynamics in MEMS and Micro TAS.
Koji Okamoto: He received his M.Sc.(Eng) in Nuclear Engineering in 1985 from University of Tokyo. He also received his Ph.D. in Nuclear Engineering in 1992 from University of Tokyo. He worked in Department of Nuclear Engineering, Texas A & M University as a visiting associate professor in 1994. He worked in Nuclear Engineering Research Laboratory, University of Tokyo as an associate professor from 1993 to 2004. He works as a professor in Department of Quantum Engineering and Systems Science, University of Tokyo since 2004. His research interests are Quantitative Visualization, PIV, Holographic PIV Flow Induced Vibration and Thermal-hydraulics in Nuclear Power Plant.
Akihide Hibara: He received his Ph.D. in applied chemistry from University of Tokyo in 2003. He worked in Department of Applied Chemistry, University of Tokyo as a research associate from 1999 to 2003. He works in Department of Applied Chemistry, University of Tokyo as a lecturer since 2003. His research interests are physical chemistry of liquids and liquid interfaces and chemicophysical hydrodynamics of microfluidics.
Manabu Tokeshi: He is currently a group leader at the Kanagawa Academy of Science and Technology (KAST). He earned his Ph.D. degree in 1997 from Kyushu University. Following one year of postdoctoral study as a JSPS Postdoctoral Fellow at the University of Tokyo, he moved to the KAST where he is a research scientist in 1998-1999 and a sub-leader in 1999-2003. Tokeshi’s current research projects are centered on the areas of miniaturized chemical analysis systems and ultra-high sensitive detection systems.
Takehiko Kitamori: He received his Ph.D. in chemical engineering from University of Tokyo in 1990. He worked in Hitachi, Ltd. from 1980 to 1990. He worked in Department of Applied Chemistry, University of Tokyo from 1990 to 1998 as a research associate, a lecturer, and an associate professor. He works in Department of Applied Chemistry, University of Tokyo as a professor since 1998. His research interests are applied laser spectroscopy and microchip chemistry and physics.
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Sugii, Y., Okamoto, K., Hibara, A. et al. Effect of korteweg stress in miscible liquid two-layer flow in a microfluidic device. J Vis 8, 117–124 (2005). https://doi.org/10.1007/BF03181654
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DOI: https://doi.org/10.1007/BF03181654