挥发性污染物水气耦合扩散数值模拟

Coupling Diffusion Simulation of Volatile Pollutant in the Water and Air

挥发性污染物泄漏进入天然水体造成水污染,因其挥发又造成空气污染。为反映水污染与空气污染的耦合影响,以压缩型VOF算法为基础,根据挥发作用中的双膜理论,利用无量纲亨利常数,建立挥发性污染物水气耦合扩散模型。利用基于非结构网格的高分辨率有界格式,对三氯乙烯和三溴乙烯点源泄漏造成的水、空气污染实现耦合模拟,模拟结果比单相模型计算结果更接近实验值。分析了环境温度和风速对不同无量纲亨利常数污染物在气液交界面上传质过程的影响。

Spill of volatile poisons into natural water bodies causes water pollution and then air pollution arises from water pollution because of volatilization. In order to explain the coupling of water pollution and air pollution, the dimensionless Henry constant of volatile poisons was used to establish coupling diffusion model based on compressed VOF method and the double film theory explained for volatilization. A high resolution bounded differencing scheme for arbitrarily unstructured meshes was applied to simulate coupling diffusion of trichloroethylene and tribromoethylene. The simulation results are in good agreement with those from single-phase model. The influence of environmental temperature, wind velocity and the dimensionless Henry constant on the mass transfer across gas-liquid interface was analysed.