Visualization of convective mixing in microchannel by fluorescence imaging

Yohei Sato, Gentaro Irisawa, Masanori Ishizuka, Koichi Hishida, Masanobu Maeda

研究成果: Article査読

82 被引用数 (Scopus)


A novel measurement technique using flourescent dye in combination with microresolution particle image velocimetry (micro-PIV) has been devised to investigate convective mixing in microspace. Tris(bipyridine)ruthenium(II), whose flourescent intensity when excited by ultraviolet light is strongly temperature dependent, was applied to the bottom surface of a cover glass, that served as the upper boundary surface of a flow channel. This set-up thus realized a two-dimensional temperature measurement of the microflow channel. A spatial resolution of 5 μm × 5 μm and a temperature resolution of 0.26 K were achieved by using a cooled CCD camera and a 10× objective lens of a microscope. Pure water at differing temperatures was injected into opposite inlets of a T-shaped microchannel bound by cover glass and PDMS. The mixing process in the junction area was visualized by the present temperature and the micro-PIV techniques. The convective heat flux was calculated from measurement of velocity and temperature and compared to the heat conduction. It is found that the heat flux due to conduction was larger than that due to convection, thus it is noted that heat conduction may be an important factor in the design process of microfluidic devices.

ジャーナルMeasurement Science and Technology
出版ステータスPublished - 2003 1月

ASJC Scopus subject areas

  • 器械工学
  • 工学(その他)
  • 応用数学


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