甲苯在气液界面表面微层中迁移变化的数值模拟研究

Study on the Numerical Simulation of the Migration Variation of Toluene in the Surface Microlayer of the Gas-liquid Interface

[目的]研究甲苯在气液界面表面微层中的迁移变化规律。[方法]使用计算流体力学(CFD)软件对表面微层中甲苯气体的迁移变化进行数值模拟,通过对液相流速、气相流速、气相浓度的模拟比较,讨论不同条件下的甲苯气体迁移变化规律。[结果]液相流速的增大,影响表面微层的形成,从而减小了气体的迁移通量;气相流速的增大,提高了气体的迁移通量,同时缩短了达到传质平衡的时间;在吸收开始的最初阶段,气相浓度越高,表面微层中气体的吸收也越快,随着时间的变化,对气体的吸收效率逐渐下降。[结论]研究所获得的成果将有助于认识有机污染物在有机气-液界面的迁移机理。

[Objective] The research aimed to study tile migration variation of toluene in the surface microlaver of the gas-liquid interface. [ Method ] A kind of CFD） （ Computational Fluid Dynamics） software was used to simulate the migration variation of toluene in the surtaee mierolayer. Trough the simulation and comparison of the liquid tlow rate, gas flow rate and concentration of gas phase,the migration variation of toluene under different conditions were discussed. [ Result] tligher flow rate of liquid phase would slow doxwn Ihe formation of the surfaee microlayer and the transfer flux would decrease ohviously. Higher flow rate of gas phase eouht shorten the time of reaching transfer halanee, at the same time, the transfer flux would increase. At the heginning of the absorption, higher concentration of gas phase can accelerate the absorption of toluene in the surface microlayer.With the time changing,the concentration of toluene reached steady state.[Conclusion]The study is helpful to understand the migration mechanism of the organic pollutant in the surface microlayer of the gas-liquid interface.