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设计并制作了多种二维变形方波微混合器,通过荧光观测及标准偏差数值分析,在低Re数(Re≤13.33)时,考察拐角和单元长度对混合器混合效果的影响。结果表明,集成拐角的混合器存在一个临界Re值1.3,当Re<1.3时,混合基于分子扩散,拐角大小对混合效率无影响,混合效率保持在28%左右;当Re>1.3时,可以产生回流,混合效率随着拐角的减小逐渐提高。对于集成6个单元、拐角为45°、单元长度(s)为3132μm的微混合器,在雷诺系数Re=13.33时,混合效率为56%,约提高了1倍;但当拐角与混合单元长度增大时,混合效率明显降低。
A variety of two-dimensional square wave micromixers were designed and fabricated. The effects of corner and unit length on the mixing efficiency were investigated at low Reynolds number (Re≤13.33) by fluorescence observation and standard deviation numerical analysis. The results show that there is a critical Re value of 1.3 in the mixer with integrated corners. When Re <1.3, the mixing is based on molecular diffusion. The corner size has no effect on the mixing efficiency, and the mixing efficiency remains at about 28%. When Re> 1.3, Reflux, mixing efficiency with the corner of the gradual increase. For a 6 micromixer with a corner of 45 ° and a cell length (s) of 3132 μm, the mixing efficiency was 56% at Reynolds number of Re = 13.33, which was approximately doubled. However, Increasing, the mixing efficiency is significantly reduced.