论文标题
在混合增强中的折叠和拉伸表征
Characterization of Folding and Stretching in Mixing Enhancements
论文作者
论文摘要
本研究论文根据奥蒂诺（Ottino）提出的伸展和折叠理论，介绍了电动T型连接微型物的2D数值模型。通过将2美元的无质量颗粒作为8点方形细胞模拟颗粒变形。此外，提出了拉伸和折叠定义，与拉格朗日粒子方法兼容。此外，在邻近插座的200美元$平方区域中测量了混合均匀性和一致性。对在四种不同的电场条件下退出混合同质性的统计分析（93.5 v/cm，109.8 v/cm，126 v/cm和117.9 v/cm，对应于23V，27V，29V和31V的电位差异），表明，混合和均匀性并不总是会增加电场强度，甚至不断增加电场的均匀性，甚至会增加电场的能力。折叠与拉伸（$ m $）的比率阻碍了物质之间的相互作用。最后，发现最佳伸展与折叠的比例是在$ M = 0.0045 $下最大化混合效率的最大比例。
This research paper presents a 2D numerical model of an electrokinetic T-junction micromixer based on the stretching and folding theory presented by Ottino. Particle deformation was considered by simulating 2 $μm$ massless particles as 8-point square cells. Furthermore, stretching and folding definitions are proposed, compatible with a Lagrangian particle approach. Moreover, mixing homogeneity and consistency were measured in a 200 $μm$ square region of interest neighboring the outlet. Statistical analysis of the exiting mixing homogeneity at four different electric field conditions (93.5 V/cm, 109.8 V/cm, 126 V/cm and 117.9 V/cm, corresponding to a 23V, 27V, 29V and 31V potential difference) show that mixing consistency and homogeneity are not always increased with a higher electric field intensity, even after electrokinetic instabilities are formed, as increasingly unstable flow conditions decrease the ratio of folding to stretching ($m$), hindering the interaction between substances. Finally, an optimal proportion of stretching to folding was found for maximizing mixing efficiency at $m =0.0045$.
