Molecular dynamics simulation of droplet evaporation in a one-dimensional standing wave acoustic field

Abstract

In this paper, a molecular dynamics (MD) simulation has been adopted to investigate impacts of one-dimensional standing wave acoustic field on the droplet evaporation. Evaporation processes of single and multi-component droplets in nitrogen are simulated by considering acoustic wave amplitude and frequency impacts. Results reveal that the droplet evaporation rate is apparently enhanced in a pressure oscillation environment. The larger oscillation amplitude and acoustic field frequency would reduce the droplet lifetime. Besides, the instantaneous evaporation rate and droplet temperature show a periodic oscillation characteristic when the oscillation amplitude is relatively large. These simulation results indicate that the instant droplet evaporation rate would be increased by the larger pressure oscillation frequency. Moreover, water molecules in the droplet would display a stronger response to the acoustic field by comparing with the ethanol case.