摘要
单分散性液滴在食品、化工、能源、医药和材料等领域均有广泛的应用,而现行方法及装置难以兼顾高单分散性和高效率制备。为此,提出了三维分形流道集成方法实现共轴流通道对等高密度集成,并采用简易方法构建了单级和双级三维分形共轴流通道集成装置;在此基础上实验研究其液滴生成特性及尺寸分布规律。无论稳定模式还是过渡模式的液滴生成,单级4通道与8通道均保持了单通道生成的液滴特性,而生成效率分别提高至单通道的近4倍与8倍。双级16通道在4组流量下制备的液滴单分散性好,变异系数均在3.5%以内;但生成效率提高到单通道的近16倍。可见三维分形集成共轴流通道结构能够在保持制备液滴单分散性的同时提升制备效率。
Monodisperse droplets are widely used in food,chemical,energy,medicine and materials,but the current methods and devices are difficult to balance high monodispersity and high efficiency preparation.Therefore,a three-dimensional fractal approach is proposed to achieve equal and high-density integration of coaxial flow microchannels.And experimental research is conducted on the droplet generation characteristics and size distribution patterns.The experimental results show that under the condition of the stable mode,the coefficient of variation(CV)of droplets prepared by single channel,single stage 4-channel,and single stage 8-channel are 1.5%,1.9%,and 1.9%,respectively.The monodispersity of droplets is high.Under the condition of the transition mode,the monodispersity of droplets is relatively poor,with CV of 6.9%,6.7%,and 6.6%,respectively.Regardless of the stable mode or the transition interval of droplet generations,both the 4-channel and 8-channel channels maintain the characteristics of single channel droplet generation,and the generation efficiency is increased to nearly 4 and 8 times that of single channel,respectively.The droplets prepared with double-stage 16 channels at 4 flow rates exhibit good monodispersity,with CV all within 3.5%.But the generation efficiency has increased to nearly 16 times that of a single channel.The three-dimensional fractal integrated coaxial flow channel structure proposed in this article can improve the preparation efficiency while maintaining the monodispersity of droplets in single channel preparation.
作者
陈展珠
叶锦华
王智彬
杨智
贾莉斯
陈颖
CHEN Zhanzhu;YE Jinhua;WANG Zhibin;YANG Zhi;JIA Lisi;CHEN Ying(School of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,Guangdong,China;Key Laboratory of Functional Soft Condensed Matter in Guangdong Province,Guangzhou 510006,Guangdong,China)
出处
《化工学报》
EI
CSCD
北大核心
2024年第12期4442-4452,F0002,共12页
CIESC Journal
基金
广东省自然科学基金面上项目(2024A1515012393)
国家自然科学基金青年基金项目(51806038)。
关键词
液滴生成
微流控
集成
分形
高通量制备
多相流
droplet generation
microfluidics
integration
fractal
high throughput preparation
multiphase flow
作者简介
通信作者:王智彬(1987-),男,博士,副教授,wangzhibin@gdut.edu.cn;第一作者:陈展珠(1998-),女,硕士研究生,2569398764@qq.com。
