直流电压下基于电液耦合动力学原理的微喷试验研究

Experiment on EHD Printing under DC High Voltage

基于直流电压作用下的电液耦合微喷印系统,考察了溶液浓度和电压两个参数对喷印过程和沉积形态的影响。实验结果表明射流在收集板上沉积的宽度随溶液浓度增大而减小;浓度低时射流沉积为连续形态;浓度增大,射流沉积为液滴-细线相间或者液滴-卫星液滴相间的珠状结构;浓度增大至18%时,产生纳米纤维,直径600nm左右。对给定的EHD实验系统,仅当电压值在2.6kV～4.8kV范围内变化时可保证稳定喷射;且随着电压值增大,珠状结构的直径减小;电压值在该范围之外,无法实现稳定喷射。

Based on the EHD printing system under the DC high voltage, the influence of the concentration of solution and the voltage value on jetting process and the collected lines is investigated. Experimental results show that the collected line gets thinner with the concentration of solution increasing. The collected line is continuous at low concentration of solution. The bead form of a droplet with a filament or satellite droplets is collected with the concentration of solution increasing. At 18% concentration of solution nanofibre with the diameter of 600nm is collected. For a given EHD printing system, When the voltage value is in the range of 2.6kV～4.8kV, the jetting process is stable and the diameter of the bead decreases with the voltage value increasing. Outside this range, the stable jetting process can not happen.