凹凸を有する壁面上での気泡核成長における接触線挙動に関する分子動力学解析

抄録

Since the boiling heat transfer is much affected by the nucleation of bubble and its growth, estimation of such process is essential for the accurate prediction of the heat transfer. Practical solid surface has surface roughness unlike ideal conditions, and nanostructure on solid surface much affects the contact line motion. In this study, molecular dynamics simulation was performed in order to study the effect of the nanostructure on the bubble growth. In this simulation, the pillars were applied to the wall surface periodically and pillar height and we investigated the effect of pillar width and height. The simulation results show that the pinning of contact line to the pillar edge increases apparent contact angle, and the depinning of contact line occurs in two different forms. The first is due to the approach of liquid-gas interface and the pillar edge, where the apparent contact angle decreases to the minimum value. The second is due to the decrease in density in the dent near the contact line, where the apparent contact angle does not decrease to a minimum value and has no fixed value.