J054053 白金表面上の水の動的接触角に与える速度の影響に関する分子動力学解析([J05405]マイクロ・ナノスケールの熱流体現象(5))

概要

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The dynamic contact angle and the behavior of the contact line of water on platinum surface were investigated by using molecular dynamics (MD). The simulations were performed for a system in which water was sheared between two parallel platinum plates moving in the opposite direction with each other. The 2D-particle-mesh-Ewald method for long range force correction was used in the simulation. The contact angle defined with the water-vapor interface position in the 2nd and 3rd nearest layers along the wall was measured for the moving velocities of the wall. It was shown that the receding contact was decreased as the wall velocity was increased. The advancing contact angle was increased with the wall velocity. While the receding contact line (interface in the first nearest layer) did not move for the wall, velocity difference was observed between the advancing contact line and the wall. The fluid velocity near the receding contact line in the first layer was equal with the wall velocity up to the contact line, which indicates that the water molecules in the first layer were locked to the wall. On the other hand, the fluid velocity near the advancing contact line was slowed down in the vicinity of the contact line.
一般社団法人日本機械学会の論文
2011-09-11