Effect of turbulence induced by wind velocity on volatile pollutants mass transfer

In order to analyze the effects of the turbulence in air and water, and the interface induced by wind velocity on the volatilization and mass transfer process of volatile pollutants at the water-air interface, a water-air coupling diffusion model of volatile pollutants and a realizable k-ε model were combined to predict temporal and spatial distribution of the volatile pollutants after leakage. Analysis results show that the time-averaged velocity gradient increased with the wind velocity near the air-water interface, leading to an increase in the turbulent kinetic energy and dissipation rate. The increase of turbulent kinetic energy and dissipation rate promoted the volatilization and mass transfer process in the rear region of pollutants. The higher the wind velocity was, the larger space the rear region of concentration occupied; the greater the turbulent kinetic energy and dissipation rate were, the more rapidly the pollutant concentration in water decreased. The effect of wind velocity on pollutant diffusion in the air was seen earlier than that in the water. The improvement degree of the turbulent dissipation rate that increased with wind velocity was more significant than that of the turbulent kinetic energy that increased with wind velocity.