Efficient generation of droplets through three-dimensional fractal integrated coaxial flow channels
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.
万方数据
维普
