Numerical Simulation of Passive Micromixers

• Main Authors: Yi-Hung Lin, 林弈宏
• Other Authors: Jun-Chi Wu
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/37814815353176423842

碩士 === 國立中央大學 === 機械工程研究所 === 93 === Analytical chemistry and life sciences are the recent application trend in the microfluidic system, in which various fluids mixing have profound effect on the reaction efficiency in the microfluidic system. This work performs a numerical study on the flow characteristic and mixing quality of the T-type and injection micromixers. Numerical simulation reveals three distinct flow patterns in the T-type mixer (the channel width is 600 μm and the channel height is 300 μm): 1) stratified flow (Re<40), 2) vortex flow (40<Re<150), 3) engulfment flow (Re>150). While the stratified flow and vortex flow does not enhance the mixing quality, but the engulfment flow leads to significant improvement of mixing quality. For the injection micromixer, simulations are perform for the injection mixer with the channel width and height of 1000 μm and the injection nozzle width various from 70.71 to 200 μm. The utilization of the face-to-face injection nozzle helps the increment of fluid contact area. From simulation results, we found that the enhancement of mixing quality can be achieved either from decreasing the nozzle size or from decreasing the width of the mixing chamber. While increasing the inlet Reynolds number leads to reduce the mixing quality, but it does effectively shorten the mixing time.