粗糙壁面上纳米液滴的蒸发特性

To better solve the wall-wetting problem in internal combustion engines and actively control the evaporation processes of wall-impinging fuel droplets, molecular dynamics (MD) method was used to study the influence of surface temperature, wettability and rough structures on the evaporation processes of droplets. The results show that the morphological changes of droplets are complex during the evaporation processes on surfaces with different temperatures and microstructures. As the solid-liquid interaction coefficient decreases, the thermal resistance of the solid-liquid interface increases, and the number of droplet molecules that change from the liquid phase to the vapor phase decreases significantly. Under the conditions of larger solid-liquid interaction coefficients, the total energy of droplet molecules increases with the increase of surface temperatures. With the decrease of the solid-liquid interaction coefficients, the effects of the surface temperature on the energy between the dropletmolecules and the wallatoms weaken. When the solid-liquid interaction coefficient is low, the order of the total energy of the droplet molecules on the surfaces with different microstructures is smooth surface > pit-shaped surface > grid-shaped surface > boss-shaped surface > secondary boss-shaped surface.