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http://dx.doi.org/10.6112/kscfe.2012.17.2.065

NUMERICAL STUDY OF THE EFFECTS OF THE GOVERNING NON-DIMENSIONAL PARAMETERS ON THE DROPLET EJECTION BEHAVIOR  

Kim, E. (Dept. of Mechanical Engineering, POSTECH)
Baek, J. (Dept. of Mechanical Engineering, POSTECH)
Publication Information
Journal of computational fluids engineering / v.17, no.2, 2012 , pp. 65-70 More about this Journal
Abstract
The droplet ejection behavior from drop-on-demand printhead are investigated numerically in terms of the non-dimensional parameters. The numerical simulation is performed using a volume-of-fluid model. It is important to eject droplet within the printability range, where the droplet is ejected in stable manner without satellite droplets. Generally, the printability range has been determined by Z number, which is the inverse of Oh number. However, it is found that the ejection of droplets with same Z number can exhibit different behavior depending on the value of Ca and We number. Therefore, it is insufficient to determine the printability range only with Z number. Instead, other non-dimensional parameters, such as Ca and We number, should be considered comprehensively.
Keywords
CFD; inkjet printing; droplet ejection; drop-on-demand;
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