T型微通道制备可控粒径SiO2微球的数值模拟

摘要

通过数值模拟对T型通道中微液滴粒径控制的主要因素进行探讨,并结合实验验证确定了稳定控制液滴粒径的条件.结果表明离散相与连续相入口管径比及流速比是控制粒径的主要因素,并获得了50,80,120 μm粒径的SiO2微球(入口管径比为5,流速比为4,6,10),其球形度大于93％,单分散性小于5％.实验结果与数值模拟匹配性较好.%A numerical simulation was processed to investigate the main factors of droplet diameter formatted in the T-junction microchannel,and to verify from the experiment.The results showed that the main factors influencing droplets diameter were the geometry ratio of discrete phase inlet and the continuous phase inlet (2＜l＜10) as well as the velocity ratio (4＜k＜16),silicon particles with diameters of 50,80,120 μm (l=5,k=4,6,10) reached spherical degree above 93％,monodispersity,CV ＜5 ％ of statistics.In conclusion,the numerical simulation and experiment were in good consistency.