2618 流動ピストンモデルによる先細ナノチューブノズル内の水流の分子動力学解析(S44-3 マイクロ・ナノ流れの数値解析,S44 マイクロ・ナノフルイディクス)  [in Japanese] 2618 Molecular Dynamics Study of Water Flow through Convergent Nanotube Nozzles using Fluidized Piston Model  [in Japanese]

We have conducted molecular dynamics simulations of water flow through carbon nanotube junctions. In order to drive the stready flow through non-uniform channel of molecular convergent nozzle, the fluidized piston model is used. The results show that the streaming velocity of water increases and the pressure decreases, and the temperature increases as they flow through the junction region. Higher streaming velocity leads to the upstream density to increase while that of the downstream does not change substantially. The streaming velocity dramatically rises in the junction region whereas it remains almost the same in each nanotube. The acceleration becomes larger with higher inlet streaming velocity. It is more noticeable for the junctions with larger cross-sectional ratios but is negligible for the smaller ratios. We have also proposed a definitions of "internal" radius of CNTs.