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RISS 인기검색어
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- 저자 : 손소연 ( So Youn Son ) (검색결과 2 건)
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포스터 전시회 : 웨버수에 따른 동적 접촉각 고려 시 액적 충돌 및 퍼짐 현상에 대한 수치해석적 연구
손소연 ( So Youn Son ),김소윤 ( So Yoon Kim ),고권현 ( Gwon Hyun Ko ),유홍선 ( Hong Sun Ryou ) 한국액체미립화학회 2012 한국액체미립화학회 학술강연회 논문집 Vol.2012 No.-
The contact angle is one of the significant parameters to simulate droplet spreading phenomena after impingement on the solid surface. It is usually assumed that contact angle is a material property and adapted in boundary condition to analyze the droplet spreading motion. However, in wetting phenomena, contact angle has various values according to contact line movement. In the present study, we analyze the droplet spreading and impingement motion considering dynamic contact angle function that is obtained from single droplet impingement and spreading experiment on the bare and flat surface for different Weber numbers. Fluent 6.3 is used for droplet simulation and Volume of Fluid (VOF), the most famous interface tracking method, is adapted for analysis of interface between liquid and gas phases. The numerical result considering dynamic contact angle is compared to the experimental data, numerical result using the Cubic Interpolated Pseudo-particle (CIP) method by Yabe, and numerical result considering static contact angle in terms of droplet deformation, spreading radius, spreading height at Weber numbers, 4.43 and 11.33, respectively. The study shows that numerical results agree well with the experimental data in maximum spreading radius and spreading height. Indeed, overall, the study shows increasing spreading radius and height as the Weber numbers increase.
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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.
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