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DTP 시스템에서 소재의 이송 및 부착거리가 액적 거동에 미치는 영향에 관한 수치적 연구
김길동(Gil Dong Kim),이길원(Gil Won Lee),박우범(Woo Beom Pakr),박차식(Chasik Park),박경우(Kyoungwoo Park) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.6
In high speed of single-pass type DTP(digital textile printing) system, the printing quality of a shear-type piezoelectric inkjet printhead is influenced by the nozzle shape, the substrate movement, and distance between nozzle exit and substrate. It is also well known that the printing quality is generally dependent on the volume and velocity of main and satellite droplets and break-up time. Therefore, in the present work, the droplet behavior of a piezoelectric actuator is investigated numerically. The transient three-dimensional conservation equations of mass and momentum are solved by the computational fluid dynamics(CFD). The continuous surface force(CFS) model is used in order to predict the effect of surface tension force in the free surface flow. The volume-of-fluid method with the piecewise linear interface construction (PLIC) scheme is employed for tracking the interfacial movement and reconstructing the interface between ink and air. The interaction between the air flow induced by droplet drag and the Couette flow entrained from the substrate movement is also investigated as well as the effect of distance between nozzle exit and substrate.