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CIP 법을 이용한 동적 접촉각을 고려한 벽면 충돌 후 액적의 퍼짐 현상에 대한 수치해석 연구
손소연(So Youn Son),고권현(Gwon Hyun Ko),명상엽(Sang Yeong Myeong),박정렬(Jeung Yeul Park),최영환(Yeong Hwan Choi),유홍선(Hong Sun Ryou) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Droplet impinging phenomena frequently happens in many fields such as spray cooling, coating and inkjet technology and it became origin of single droplets impingement and spray process to modify. Droplet behavior after collision is relative to droplet velocity, droplet size and other parameters. Simulation of contact angle between wall and droplet in wetting phenomena, in particular, accounts for inertia force, viscous force, gravity and surface tension. While static contact angle which is material property has influent to analyze phase interaction between gas and liquid phases, dynamic contact angle is necessary to calculate for dynamic interaction. Dynamic contact angle has various values according to capillary numbers in term of droplet velocity, viscous force and surface tension. The aim of this study is that numerical result considering dynamic contact angle is compared with the numerical data when using static contact angle and experimental data. The numerical result predicted well the deformation of droplet spreading radius and height. The numerical results considering dynamic contact angle have smaller spreading radius and higher height than the data considering static contact angle. Furthermore, the numerical result shows good agreement with experimental data in spreading diameter, height and contact angle change as time elapsed.