Evaporation of High-salt Solution Under Electric Field

Abstract:

Recent studies show that an applied electric field can significantly alter the evaporation process and evaporation rate of pure water. In order to investigate the effect of the applied electric field on the microstructure and evaporation properties of high salt solutions， molecular dynamics simulations （MD） were adopted to simulate pure water and LiCl， KCl and CaCl₂ salt solutions in parallel （x-direction） and perpendicular （z-direction） directions to the liquid. Based on the simulation results， the influence of the electric field on the evaporation speed， the orientation of water molecules， hydrogen bonding and hydrated ions was analyzed， and the motion of different ions in the solution under the electric field was detected and compared. The electric field in the x-direction can significantly increase the proportion of free water molecules in the salt solution. When the electric field in the x-direction modulates from 0 to 0.3 v·nm^-1， the proportion of free water molecules in LiCl， KCl and CaCl₂ solutions augment by 48%， 38% and 56% respectively， effectively enhancing the evaporation rate of the high-salt solution.