Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

A Numerical Study on Stirring Characteristics in a Microchannel with Various Arrangement of Blocks

마이크로채널 내 블록의 정렬과 구조변경에 따른 교반특성

  • 서용권 (동아대학교 기계산업시스템공학부) ;
  • 허형석 (동아대학교 대학원 기계공학과)
  • Published : 2003.07.01
Download PDF
⟨ Previous Next ⟩

Abstract

Numerical study on stirring characteristics in a microchannel with blocks arranged periodically has been performed. Viscous flows through the microchannel is simulated three-dimensionally using a commercial code, FLUENT 6.0. Focus is given to the effect on the stirring characteristics of the geometric factors including the pitch, height and angle of the block arrangement. The numerical results at low Reynolds numbers show that the particles' trajectories in the microchannel heavily depend on the block arrangement. A nonlinear dynamical tool, i.e. Lyapunov exponent, was used in analysing the mixing effect. It was found that the mixing is the most effective at a certain combination of parameter values.

Keywords

References

  1. Gad-el-Hak, M., 2002, 'The MEMS Handbook,' CRC Press, New York
  2. Weilin, Q.; Mala, G.M. and Li,D., 2000, 'Pressure-Driven Water Flows in Trapezoidal Silicon Microchannels,' Int. J. Heat and Mass Transfer, Vol. 43, pp. 353-364 https://doi.org/10.1016/S0017-9310(99)00148-9
  3. Mala, G.M. and Li, D., 1999, 'Flow Characteristics of Water in Microtubes,' Int. J. Heat and Fluid Flow, Vol. 20, pp. 142-148 https://doi.org/10.1016/S0142-727X(98)10043-7
  4. Meinhart, C. D., Wereley, S. T., Santiago, J.G., 1999, 'PIV Measurements of a Microchannel Flow,' Exp. Fluids, Vol. 27, pp. 417-419 https://doi.org/10.1007/s003480050366
  5. Chate, H., Villermaux, E., Chomaz, J.M., 1999, 'Mixing Chaos and Turbulence,' Kluwer Academic Pub
  6. Stroock, A.D., Destinger, S.K.W., Ajdari, A., Mezic, I., Stone, H.A., and Whitesides, G.M., 2002, 'Chaotic Mixer for Microchannels,' Science, Vol. 295, pp. 647-651 https://doi.org/10.1126/science.1066238
  7. Aref, H., 2002, 'The Development of Chaotic Advection,' Phys. Fluids, Vol. 14, pp. 1315-1325 https://doi.org/10.1063/1.1458932
  8. Suh, Y.K. and Kim, Y.K., 1998, 'Enhancement of Heat Transfer by Chaotic Advection in a Single Screw Extruder with a Staggered Flight Geometry,' Proc. Int. Conf. 11th IHTC, Vol. 5, pp. 399-404
  9. Ottino, J.M., 1989, 'The Kinematics of Mixing : stretching, chaos, and transport,' Cambridge University Press, pp. 111-129