• Higher mixing efficiency in staggered herringbone mixer
    The liquid streams in a microchannel are hardly mixed to form laminar flow, and the mixing issue is well described by a low Reynolds number scheme. The staggered herringbone mixer (SHM) using repeated patterns of grooves in the microchannel have been proved to be an efficient passive micro-mixer. However, only a negative pattern of the staggered
    herringbone mixer has been used so far after it was first suggested, to the best of our knowledge. In this study, the mixing efficiencies from negative and positive staggered herringbone
    mixer patterns as well as from opposite flow directions were tested to investigate the effect of the micro-structure geometry on the surrounding laminar flow. The positive herringbone pattern showed better mixing efficiency than the conventionally used negative pattern. Also, generally used forward flow gives better mixing efficiency than reverse flow. The mixing was completed after two cycles of staggered herringbone mixer with both forward and reverse flow in a positive pattern. The traditional negative pattern showed complete
    mixing after four and five cycles in forward and reverse flow direction, respectively. The mixing effect in all geometries was numerically simulated, and the results confirmed more efficient mixing in the positive pattern than the negative. The results can further enable the design of a more efficient microfluidic mixer, as well as in depth understanding of the phenomena of positive and negative patterns existing in nature with regards to the surrounding fluids.


    Posted Nov 24, 2017, 10:04 AM by WJ C
Showing posts 1 - 1 of 13. View more »


Bionanotechnology, Biomedical Engineering, Biochemical Engineering, BioMEMS,  Biosensor, Bioseparations

  • BioMEMS and Biosensor development
  • Separation and identification of biomolecules including protein and human cancer and stem cells
  • Rapid on-site environmental monitoring
  • Wearable diagnostic health monitoring 


  • Min Hyung Kim, Jeongjick Lee, Kihwan Nam, Hyeonchul Ko, Myeonggu Son, In Soo Park, Sangyoup Lee, Dae Sung Yoon, Woo-Jin Chang, Sei Young Lee, Young Ro Yoon, Sang Woo Lee, Automated Dielectrophoretic tweezers-based force spectroscopy system in a microfluidic Device, Sensors, 17(10), 2272, 2017.  
  • Young-Jin Jung, Taewoo Lee, Seungyeop Choi, Sei-Young Lee, Jaehong Key, Yeong-Min Yoo, Woo-Jin Chang, Han-Sung Kim, Sang Woo Lee, Selective position of individual cells without lysis on a circular window array using dielectrophoresis in a microfluidic device, Microfluidics and Nanofluidics, 21:150, 2017. 

Recent News

  • Tae Joon received DDF 18-19 Tae Joon received Distinguished Dissertation Fellowship for 2018-19. Congratulations!!
    Posted Mar 29, 2018, 2:57 PM by WJ C
  • Tae Joon passed prelim Tae Joon passed prelim for his Ph.D. thesis on Jan. 26th. Congratulations.
    Posted Jan 29, 2018, 11:06 AM by WJ C
  • Rizwen passed defense Rizwen passed defense for his master degree on Dec. 1st. He will graduate and continue Ph.D. from Spring 2018. Congratulations Rizwen. 
    Posted Dec 1, 2017, 6:10 PM by WJ C
  • Hwangjae graduated Hwangjae Lee finished his M.S. in August 2017. Congratulations. 
    Posted Aug 31, 2017, 6:51 PM by WJ C
  • Bryce joined the team during summer, welcome. A new UWM student, Bryce Baker, joined the team during summer. Welcome Bryce. 
    Posted Jul 12, 2017, 1:01 PM by WJ C
Showing posts 1 - 5 of 39. View more »