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격자 볼츠만 법을 이용한 이질표면 위에 존재하는 액적의 크기 변화에 따른 거동의 3차원 수치해석 연구
최호연(H.Y. Choi),손성완(S.W. Son),하만영(M.Y. Ha) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
The characteristic of the droplet located on a heterogeneous surface is numerically analyzed using the 3-D Lattice Boltzmann Method(LBM). LBM is having an advantage of the two phase flow. Predictions are made whether the droplet will be separated or not. The separation time is affected according to changes of the contact angles of the hydrophilic and hydrophobic surface, and the droplet size. The droplet separation mechanism is investigated by analyzing the velocity vector around the phase boundary line and shape of the droplet. If the difference between the contact angles of the hydrophilic and hydrophobic surfaces is bigger, a droplet located at the center of a heterogeneous surface shows a trend of being easily separated. The droplet separation time increases according to the decrease of contact angle of hydrophobic surface, and the more the contact angle of the hydrophobic surface increases, the more the droplet separation time decreases. Also, the droplet separation time shows a decreasing trend when the droplet size decreases. Furthermore, the result show that separation time and the map of droplet separation changed with respect to the droplet size.