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압전 액츄에이터의 메니스커스 제어를 통한 온 디멘드(On-demand) 전기 수력학 프린팅
김영재(Y. J. Kim),김도형(D. H. Kim),황정호(J. H. Hwang),김용준(Y. J. Kim) 한국정밀공학회 2009 한국정밀공학회 학술발표대회 논문집 Vol.2009 No.6월
On-demand ejection of ultra-fine droplets that uses both electrohydrodynamic (EHD) force and mechanical actuation is presented. The liquid meniscus was controlled by a piezoelectric actuator and droplets were ejected by EHD force. Through these effects, it was possible to obtain a high operational jetting frequency of 5㎑ with a short delay-time (about 50 us) when compared with existing on-demand EHD jetting methods, such as the pulsating jet mode (3-10 msec) and the pulsed-voltage cone-jet mode(3.6 msec). Also, we obtained ultra-fine droplets at a volume that was at the femto-liter level simultaneously. The jetting characteristics were examined for both hydrophobicity and hydrophilicity of the surface of a capillary.
액적의 분사 거동을 지배하는 무차원수에 대한 수치해석적 연구
김은정(E. Kim),백제현(J. Baek) 한국전산유체공학회 2012 한국전산유체공학회지 Vol.17 No.2
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.
뉴튼유체와 전단희석유체의 액적분사 거동에 대한 수치해석적 연구
김은정(E. Kim),백제현(J. Baek) 한국전산유체공학회 2012 한국전산유체공학회지 Vol.17 No.3
The droplet ejection behavior from drop-on-demand printhead are investigated numerically for Newtonian and shear-thinning fluid. The numerical simulation is performed using a volume-of-fluid model. In this study, we compare the printable range in terms of Z number and pinch-off time for Newtonian and shear-thinning fluids. The printability range are found to be 1.08 ? Z ? 12.9 for Newtonian fluid and 0.8 ? Z ? 12.9 for shear-thinning fluid. However, air entrainment is observed during merging of primary and satellite droplet within the printability range. The pinch-off time of the shear-thinning fluid is apparently shorter compared to the corresponding Newtonian fluid due to shear-thinning effects and the differences in the pinch-off time is enlarged significantly when the capillary number is larger than 0.5.
정전기장 유도된 잉크젯 프린터 헤드를 이용한 탄소나노튜브 잉크의 Drop-On-Demand 특성 연구
崔在鎔(J. Y. Choi),金容載(Y. J. Kim),孫尙郁(S. U. Son),金永珉(Y. M. Kim),李錫漢(S. H. Lee),邊渡泳(D. Y. Byun),高漢瑞(H. S. Ho) 대한전기학회 2007 전기학회논문지 Vol.56 No.8
This paper presents the DOD (Drop-On-Demand) characteristic using the electrostatic field induced inkier printing system. In order to achieve the DOD characteristic of electrostatic field induced inkjet printing, applied the bias voltage of 1.4 ㎸ and the pulse voltage of 2.0 ㎸ ~ 2.7 ㎸ using high voltage pulse generator. Electrostatic field induced droplet ejection is directly observed using a high-speed camera and for investigated DOD characteristic, CNT ink used. The electrostatic field induced inkjet head system has DOD characteristic using pulse generator which can be applied pulse voltage. The bias voltage has a good condition which form meniscus and has micro dripping mode for small size micro droplet. Also, the droplet size decreases with increasing the applied pulse voltage. This paper shows DOD characteristic at electrostatic field induced inkjet head system. Therefore, electrostatic DOD inkjet head system will be applied industrial area comparing conventional electrostatic inkjet head system.