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격자 볼츠만 법을 이용한 평면 바닥과 구형 팁 사이에 존재하는 액적의 특성 연구
김형락(H. R. Kim),김형진(H. J. Kim),이상진(S. J. Lee) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
The characteristic of the droplet between the spherical tip and a moving wall is numerically analyzed using the 3-D LBM. Predictions are made whether the droplet will be separated or not. The separation time is affected according to changes of the initial contact angle of the flat bottom wall and a spherical tip surface. The present results show the change in the shape of the droplet as a function of time when the droplet is moving between the bottom wall and a spherical tip.
격자 볼츠만 법을 이용한 평면 팁 사이에 존재하는 액적의 특성 연구
김형락(H. R. Kim),김형진(H. J. Kim),이상진(S. J. Lee) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
The characteristic of the droplet between the flat tip and a moving wall is numerically analyzed using the 3-D Lattice Boltzmann Method(LBM). LBM is having an advantage of the multi-phase(or two-phase) flow. Predictions are made whether the droplet will be separated or not. The separation time is affected according to changes of the initial contact angle of the flat bottom wall and a flat tip surface. The present results show the change in the shape of the droplet as a function of time when the droplet is moving between the bottom wall and a flat tip.
수평으로 움직이는 평면 바닥과 팁 사이에 존재하는 액적의 동적 거동에 관한 연구
김형락(H.R. Kim),김형진(H.J. Kim),이상진(S.J. Lee),하만영(M.Y. Ha) 한국전산유체공학회 2019 한국전산유체공학회지 Vol.24 No.1
This study carries out 3-D numerical simulation using the lattice Boltzmann method (LBM) to investigate the dynamic behavior of the droplet formed between a moving bottom wall and a flat tip. In this study, we considered the effect of the initial droplet contact angle of the flat bottom wall and a flat tip surface. The present results show the change in the shape of droplet as a function of time when the droplet is moving in between the bottom wall and a flat tip. This study also shows the variation of the dynamic contact angle between the droplet and the bottom wall or a flat tip as a function of time.
서로 다른 세가지 접촉각을 가지는 이질표면 위에 존재하는 액적의 거동에 관한 3차원 수치해석 연구
이경훈(K.H. Lee),손성완(S.W. Son),김형락(H.R. Kim),하만영(M.Y. Ha) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
The behavior of the semi-spherical droplet existing on a heterogeneous surface was researched using a 3-D Lattice Boltzmann method. In this paper, the behavior of droplet studied that it is affected by contact angle of surface and size of droplet. The droplet locates on the heterogeneous surface, which includes hydrophilic and hydrophobic. In this paper, contact angle of hydrophilic range is from 20 to 70 and contact angle of hydrophobic is consisted of 140 and 150. As time goes by droplet shows three different patterns. If the difference of contact angle between hydrophobic and hydrophilic surface is small that the droplet doesn’t easily separate. And the droplet reaches a new equilibrium state on the heterogeneous surface. And effect of size of droplet shows two phenomena. If the droplet size becomes bigger, the behavior of droplet is shown that whole droplet spread out over the hydrophilic surface. On the other hands size of droplet becomes smaller that it is separated two droplets. In other words there is an effect of size about the behavior of droplet. The droplet separation mechanism is investigated by analyzing the velocity vector around the phase boundary. The temporal volume fraction and temporal vector field which vary by time were shown for each case carried out. And the time spent for dividing the droplet into two droplets was calculated.