Simulation of Bubble Formation by the Impact of Printed Metal Double Droplets on Solids
Inkjet printing gallium metal droplets impacting the solid surface will produce air entrainment,resulting in bubble deposition and the phenomenon of inkjet printing wires are not interconnected,in order to solve this problem,in-depth study of relevant parameters affecting the formation of bubbles is needed.Using Ansys Fluent software,a 2-dimensional simulation model was established using the VOF coupled level set method to simulate the bubble formation process of a gallium metal double droplet impacting a solid copper substrate.Through the study of horizontal wall temperature,double droplet spacing,tilted wall angle,tilted wall temperature and other parameters on the metal double droplet impact solid wall bubble formation law,so as to achieve the purpose of eliminating bubbles,improve the interconnectivity of the printed wire.For the horizontal substrate,the size of bubbles shows a bi-directional variation at different substrate temperatures,while the increase in the metallic double droplet spacing is more favorable for droplet spreading.For the horizontal substrate,the size of bubbles at different substrate temperatures shows a bi-directional change,while the increase of metal double droplet spacing is more favorable for droplet spreading.When the metal double droplet spacing S=D0-2.38D0,there are bubbles formed;when S=2.38D0-2.5D0 there is a break in the droplet spreading,and the bubbles do not change significantly with the increase of temperature;when the metal double droplet spacing S=2.6D0,with the increase in temperature no longer produces bubbles,this time the inkjet printing droplets show optimal accuracy,thereby improving the print wire interconnectivity of the printed wires.For tilted substrates,the bubbles formed by metallic double droplets are characterized by the parameter Weber number(We⊥)and the parameter(K⊥).When hitting the tilted wall with Weber number We⊥＞15,K⊥＞0.035,the droplet will form bubbles on the solid surface;when We⊥＞16、K⊥＞0.04,the diameter of the formed bubbles decreases with the increase of the temperature of the wall;when 15＜We⊥＜16,0.035＜K⊥＜0.04,the droplet appears to be spreading and breaking,and the diameter of the bubbles decreases with the increase of the wall temperature;the droplet spreading and breaking occurs.The bubble diameter decreases with the increase of wall temperature;when 5＜We⊥＜15,0.015＜K⊥＜0.035,the droplet spreads and breaks,and the bubble diameter becomes larger;when We⊥＜5,K⊥＜0.01,the bubble formed by the droplet in the substrate disappears,and this time is the best precision of inkjet printing droplet,which can make the interconnectivity of the printed wires improve.
inkjet printinggallium metal dropletsdroplet spreadingbubblesfinite element analysisVOF coupled level setwall anglewall temperaturedouble droplet spacinginterconnectivity
NETL
NSTL
万方数据
维普
