中文摘要：

基于成涡强化混合原理,提出了一种布置成涡结构的被动式微混合器,并借助商业软件对该微混合器进行了三维数值模拟。模型采用有限体积法离散、SIMPLEC算法进行层流计算。同时借助混合强度作为混合特性的衡量指标,分析了体积流量0.18μL/min至1.75 mL/min范围下微混合器内流体的混合特性。结果显示,通过在弯曲通道内布置成涡结构、改变成涡结构的数目和位置等方式,对微混合器内流体的混合性能具有显著影响。综合考虑混合强度与结构参数等因素,当-45°对称布置两个双缝隙结构时,该被动式微混合器可获得最佳的混合强度。

英文摘要：

According to the mixing principle of vortex-generated enhancing,a passive micromixer arranged with the vortex-generated structures was proposed.Three-dimensional numerical simulation was carried out with adoption of Computational Fluid Dynamic software in this paper.The finite volume method was used to disperse the three-dimensional steady incompressible N-S equations. Mixing index is measure standard used to evaluate the degree of mixing.The effect of mixing performance was analyzed when changing the volume flow from 0.18 uL/min to 1.75 mL/min of this micromixer.Our studies show that the structural parameters,e.g.different aspect ratio of microchannels and the inflow angle of separation channel,have an important effect on the mixing performance.Taking account for the relation between mixing intensity and structural parameters, when symmetrically arranged two double gaps structures with an angle of minus 45 degrees,this passive micromixer could achieve the optimum mixing performance.