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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。
Based on the principle of vortex-intensifying mixing, a passive micro-mixer arranged in a vortex structure is proposed, and the micro-mixer is three-dimensionally simulated by means of commercial software. The model is discretized by the finite volume method and the SIMPLEC algorithm is used for laminar flow calculation. At the same time, the mixing characteristics of the fluid in the micromixer at volume flow rate of 0.18 μL / min to 1.75 mL / min were analyzed by means of mixing intensity as a measure of the mixing characteristics. The results show that the mixing performance of the fluid in the micromixer has a significant effect by arranging the vortex structures within the curved channels, changing the number and location of the vortex structures, and the like. Taking into account the factors such as mixing strength and structural parameters, when the two double-gap structures are symmetrically arranged at -45 °, the passive micro-mixer can obtain the best mixing strength.