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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2012, Vol. 13 Issue (8): 584-595    DOI: 10.1631/jzus.A1200045
Mechanics and Civil Engineering     
Numerical investigation of the influence of companion drops on drop-on-demand ink jetting
Hai-yun Zhang, Jin Wang, Guo-dong Lu
Institution of Engineering and Computer Graphics, Zhejiang University, Hangzhou 310027, China
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Abstract  In this study we characterized and investigated the specific phenomenon of “companion drops” in the drop-on- demand (DOD) ink jetting process. A series of simulations based on a piezoelectric DOD printhead system is presented, adapting the volume-of-fluid (VOF) interface-capturing method to track the boundary evolution and model the interfacial physics. The results illustrate the causality between the generation of companion drops and droplet deviation behavior, as well as their close correlations with ink jetting straightness and printing accuracy. The characteristics of companion drops are summarized and compared with those of satellite drops. Also, a theoretical mechanism for the generation of companion drops is presented, and their effects and behaviors are analyzed and discussed. Finally, the effects of critical factors on the generation of companion drops are investigated and characterized based on variations in the printable pressure range. Recommendations are given for the suppression of companion drops and for the improvement of printing accuracy.

Key words： Drop-on-demand (DOD) ink jetting      Droplet deviation      Companion drops      Computational fluid dynamics (CFD)      Volume-of-fluid (VOF) method     
Received: 21 February 2012      Published: 03 August 2012
CLC:  O35  
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Hai-yun Zhang
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Hai-yun Zhang, Jin Wang, Guo-dong Lu. Numerical investigation of the influence of companion drops on drop-on-demand ink jetting. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2012, 13(8): 584-595.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A1200045     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2012/V13/I8/584

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