微液滴制备及其在静止流体中的浮升过程
发布时间：2019-04-17 09:45
【摘要】：采用自制微流控共轴流装置制备出粒径d_p=100～600μm且球形度良好的单一粒径微液滴,对大豆油及甲苯两种微液滴在静止流体中的浮升过程和速度进行了研究.结果表明,生成液滴的粒径d_p主要由微通道锥口直径Dt(40～450μm)确定;既定锥口直径下,液滴粒径随连续相流量Q_c增大稳定减小,而增加分散相流量只改变液滴产生频率(生成颗粒群),对粒径影响微弱,建立了d_p与Q_c的关联式,关联度大于0.99.由于表面张力作用导致微液滴具有弹性球行为,微液滴的液滴阻力系数C_D与雷诺数Re的关系与刚性颗粒一致;因尾流效应颗粒群中各颗粒在交替追赶中前行,导致颗粒群浮升速度高于单颗粒,颗粒群比单颗粒浮升速度高约30%.
[Abstract]:Single particle size microdroplets with diameter of 100 ~ 600 渭 m and good sphericity were prepared by a self-made microfluidic co-axial flow device. The floating process and velocity of soybean oil and toluene microdroplets in stationary fluid were studied. The results show that the diameter of the droplets is mainly determined by the microchannel cone diameter Dt (40 ~ 450 渭 m). Under the given cone diameter, the droplet diameter decreases steadily with the increase of the continuous phase flow rate, while the increase of the dispersed phase flow rate only changes the droplet generation frequency (forming particle group), which has a weak influence on the particle size. The correlation between d _ (p) and Q _ (c) is established, and the correlation between d _ (p) and Q _ (c) is established. The correlation degree is more than 0.999. Because of the effect of surface tension, the drop resistance coefficient C _ (?) D and Reynolds number (Re) are consistent with the rigid particles due to the elastic spherical behavior of the droplets. Due to the wake effect, the floating speed of the particles in the particle group is higher than that of the single particle, and the floating speed of the particle group is about 30% higher than that of the single particle.
【作者单位】： 四川大学化学工程学院;
【分类号】：O35
[Abstract]:Single particle size microdroplets with diameter of 100 ~ 600 渭 m and good sphericity were prepared by a self-made microfluidic co-axial flow device. The floating process and velocity of soybean oil and toluene microdroplets in stationary fluid were studied. The results show that the diameter of the droplets is mainly determined by the microchannel cone diameter Dt (40 ~ 450 渭 m). Under the given cone diameter, the droplet diameter decreases steadily with the increase of the continuous phase flow rate, while the increase of the dispersed phase flow rate only changes the droplet generation frequency (forming particle group), which has a weak influence on the particle size. The correlation between d _ (p) and Q _ (c) is established, and the correlation between d _ (p) and Q _ (c) is established. The correlation degree is more than 0.999. Because of the effect of surface tension, the drop resistance coefficient C _ (?) D and Reynolds number (Re) are consistent with the rigid particles due to the elastic spherical behavior of the droplets. Due to the wake effect, the floating speed of the particles in the particle group is higher than that of the single particle, and the floating speed of the particle group is about 30% higher than that of the single particle.
【作者单位】： 四川大学化学工程学院;
【分类号】：O35
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