MOLECULAR DYNAMICS STUDY ON LIQUID FILM EVAPORATION ON THE FRACTAL ROUGH SURFACES

Abstract

A molecular dynamics simulation is performed to study the liquid film evaporation on rough surfaces constructed by the Cantor set fractal. The liquid film evaporation on the rough surfaces with different roughness and fractal dimensions is presented and is compared with that on smooth surface. The results indicate that the response speed for evaporation on the rough surface is faster than that on the smooth surface and is accelerated with the increase of the roughness height and the fractal dimensions. Protrusions on the rough surface are conducive to heat transfer enhancement, and thus, the evaporation on a rough surface can reach equilibrium earlier than that on a smooth surface. With increasing roughness and fractal dimension, the evaporation rate and the thickness of the non-evaporating liquid layer increase.