NUMERICAL STUDY ON THE MICRO-LINE PATTERNING PROCESS USING AN INKJET PRINGTING METHOD

잉크젯 방법을 통한 마이크로 라인 형성에 관한 수치적 연구

The droplet motion on a flat substrate with contact angle hysteresis is studied by solving the equations governing the conservation of mass and momentum. The liquid- gas interface is determined by an level-set method which is based on a sharp-interface representation for accurately imposing the matching or coupling conditions at the interface. The method is modified to treat the dynamic contact angle at the liquid-gas-solid interface. The computations are performed to investigate a droplet impact and merging pattern on a flat substrate to find a optimal condition in a micro-line patterning process. The effects of dynamic contact angles on droplet motion are quantified.