Effect of solid surface structure on the condensation flow of Argon in rough nanochannels with different roughness geometries using molecular dynamics simulation

In this study, the molecular dynamics method is applied for condensation flow inside rough and smooth nanochannels by attaching the roughness on the lower walls. The influence of roughness geometry and height on the condensation characteristics is studied, and the corresponding distribution of density, velocity, and temperature are obtained. Also, the influence of rough surfaces on the condensation rate and the number of atoms that shift the liquid phase is investigated. Results indicate that the rough surface decreases the density fluctuations in its neighboring as well as the velocity level and temperature near the lower wall. Moreover, rough surfaces trap more atoms in the liquid film, which empower the condensation process of flow. It is concluded that the behavior of condensation flow in rough nanochannels is dependent on the roughness geometry and height so that by enhancement of the roughness height, the flow is more affected.