Dynamic behavior of near-surface nanobubbles formation and development

In this work, the molecular dynamics simulation was employed to study the formation and development mechanisms of near-surface nanobubbles, especially, the effects of wettability on the dynamic behaviors of nanobubbles was exhibited and analyzed. The results show that there are nanobubbles in the evolution process, as well as a gas-enriched layer in the system. The formation of nanobubbles can be divided into two stages, i.e., the initial stage and steady stage, according to the change of kinetic energy. Then, it is indicated that wettability has obvious effects on the formation of nanobubbles. In the coalescence process of nanobubbles, the vapor molecules in small bubbles could actively move into the large ones leading to the continuous change of the shape of the coalesced bubbles. Finally, the hydrophobic wall is found more favorable to gaseous molecules, which makes it easier to form surface nanobubbles. This work provides the theoretical guidance for further practical application of near-surface nanobubbles.

Automated summary

In this work, molecular dynamics simulation was used to study the formation and development mechanisms of near-surface nanobubbles and analyze the effects of wettability on their dynamic behaviors. The results showed the presence of nanobubbles and a gas-enriched layer in the system. The formation of nanobubbles can be divided into two stages, namely, the initial stage and steady stage. Wettability was found to have a significant impact on the formation of nanobubbles. During the coalescence process, vapor molecules from small bubbles actively moved into larger ones, leading to continuous changes in the shape of the coalesced bubbles. Hydrophobic walls were found to be more favorable for gaseous molecules, making it easier to form surface nanobubbles. This work provides theoretical guidance for the practical application of near-surface nanobubbles.