Shear-induced Migration of Brownian Suspension in a Pressure-driven Microchannel Flow

  • Kim Y.W. (School of Mech. and Aero.Eng., Seoul Nat'l Univ.) ;
  • Jin S.W. (School of Mech. and Aero.Eng., Seoul Nat'l Univ.) ;
  • Kim S.W. (Samsung Advanced Institute of Technology) ;
  • Yoo J.Y. (School of Mech. and Aero. Eng., Seoul Nat'l Univ.)
  • Published : 2004.11.01


Experimental study was conducted to characterize shear-induced lateral migration of $1.0-{\mu}m-diameter$ Brownian particles flowing through a rectangular microchannel which can be used to deliver small amount of liquids, drugs, biological agents and particles in microfluidic devices. Measurements were obtained by using a mercury lamp with a light of 532-nm wavelength, an inverted epi-fluorescence microscope, and a cooled CCD camera to record particle images. Peclet number was used as a parameter to assess the lateral distribution of the particles at a fixed volume fraction of $0.1\%$. It was shown that as Pe increased, particles were moved toward the centerline of the channel, which is in good agreement with previous studies.