NUMERICAL STUDY OF DROPLET IMPACT AND MERGING PROCESSES ON A FLAT SUBSTRATE WITH CONTACT ANGLE HYSTERESIS

동접촉각 이력 효과를 포함한 평판 위에서 액적의 충돌 및 결합 현상에 대한 수치적 연구

The droplet impact and merging process on a flat substrate with contact angle hysteresis is numerically studied. The droplet deformation is determined by an improved level-set method employing a sharp-interface technique for the stress condition at the liquid-gas interface and the contact angle condition at the liquid-gas-solid interline. Based on the computations, the droplet impact and merging pattern is investigated to find the optimal condition in manufacturing a micro-line. The effects of dynamic contact angles and droplet spacing on droplet motion are quantified.