Discussion on mechanism and suppression of jet interference from adjacent nozzles in electrohydrodynamic jet printing
Aiming at the problem of charged jet interference between adjacent nozzles in the multi-nozzle electrohydrodynamic jet printing system,a numerical simulation model of jet ejection under electro-hydraulic coupling is established.The control variable method is used to reveal the reason for the interference of adjacent nozzle cones jet and the influence law of working voltage,liquid supply flow and adjacent distance on the degree of jet interference.Furthermore,a jet interference suppression method based on annular airflow assisted injection is preliminarily discussed.A numerical simulation model of jet injection under the coupling action of gas-electricity-hydraulic multi-field is also established.By studying the influence law of different airflow velocities on jet injection,the results show that jet deflection angle increases with the increase of the electrode voltage,decreases with the increase of the nozzle spacing,and does not change significantly with the solution flow rate.Under reasonable process conditions,the jet can be sprayed vertically onto the substrate.Appropriate auxiliary airflow input(5~25 m/s)can effectively suppress the interference of the nozzle cone jet caused by the electric repulsion force.When the airflow velocity exceeds the critical threshold(25 m/s),the auxiliary airflow will easily bring additional instability and uncontrollability to the nozzle cone jet.
electrohydrodynamic jet printingadjacent nozzlesjet interferenceannular air flownumerical simulation