AI 中文总结
研究环形微混合器中流速比和几何不对称性对混合性能的影响，通过数值模拟和实验，发现不对称环形混合器设计能改善混合，尤其在低至中等总流速下，且无需改变总体尺寸即可提升混合效果。
AI 中文摘要
微流体混合对于纳米颗粒制造至关重要，需要溶剂和非溶剂流快速接触以控制形成过程。已开发并分析了各种微混合器几何形状以提高混合效率。然而，对于环形微混合器，流速比和几何不对称性的作用尚未详细研究。本研究考察了两种环形微混合器设计（对称和不对称）的混合过程，重点是互溶流体混合过程中流速比和几何不对称性的影响。通过数值模拟研究不同流速和流速比下的混合行为，采用稳定有限元法进行高保真数值模拟，用浓度和速度场考察腔室不对称性对混合性能的影响。还进行了实验验证数值结果。结果表明，不对称环形混合器设计通常比传统设计能改善混合，尤其是在低至中等总流速下，且不改变混合器总体尺寸就能实现更好的混合。
英文摘要
Microfluidic mixing is important for nanoparticle fabrication, where rapid contact between the solvent and nonsolvent streams is needed to control the formation process. Various micromixer geometries have been developed and analyzed to improve mixing efficiency. However, for toroidal micromixers, the role of flow rate ratio and geometric asymmetry has not been examined in detail. In this study, the mixing process of two toroidal micromixer designs is investigated, namely symmetric and asymmetric, with emphasis on the impact of flow rate ratio and geometric asymmetry during the mixing of miscible fluids. Numerical simulations are carried out to examine the mixing behavior of these toroidal micromixers for different flow rates and flow rate ratios. High-fidelity numerical simulations are performed using the stabilized finite element method. The concentration and velocity fields are used to examine how the chamber asymmetry can affect the mixing performance. Experiments are also conducted to provide a validation for the numerical results. We demonstrate that the asymmetric toroidal mixer design generally improves the mixing over the conventional design, especially at low to moderate total flow rates. The results obtained show that improved mixing can be achieved without changing the overall mixer size.
