Mixing Performance of a Cross-Channel Split-and-Recombine Micro-Mixer Combined with Mixing Cell

Micromachines
Makhsuda Juraeva, Dong Jin Kang

Abstract

A new cross-channel split-and-recombine (CC-SAR) micro-mixer was proposed, and its performance was demonstrated numerically. A numerical study was carried out over a wide range of volume flow rates from 3.1 μL/min to 826.8 μL/min. The corresponding Reynolds number ranges from 0.3 to 80. The present micro-mixer consists of four mixing units. Each mixing unit is constructed by combining one split-and-recombine (SAR) unit with a mixing cell. The mixing performance was analyzed in terms of the degree of mixing and relative mixing cost. All numerical results show that the present micro-mixer performs better than other micro-mixers based on SARs over a wide range of volume flow rate. The mixing enhancement is realized by a particular motion of vortex flow: the Dean vortex in the circular sub-channel and another vortex inside the mixing cell. The two vortex flows are generated on the different planes perpendicular to each other. They cause the two fluids to change their relative position as the fluids flow into the circular sub-channel of the SAR, eventually promoting violent mixing. High vorticity in the mixing cell elongates the flow interface between two fluids, and promotes mixing in the flow regime of molecular diffusion dominance.

References

Jan 17, 2002·Analytical Chemistry·M H OddyJ C Mikkelsen
Oct 31, 2002·Analytical Chemistry·Abraham D StroockArmand Ajdari
Aug 17, 2004·Analytical Chemistry·Ian GlasgowNadine Aubry
Aug 28, 2004·Pediatric Clinics of North America·Frank A Fish
Dec 11, 2019·Micromachines·Wasim Raza, Kwang-Yong Kim

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Citations

Aug 28, 2021·Micromachines·Makhsuda Juraeva, Dong-Jin Kang

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