紊动水体中气液传质过程分析(英文)

Studies on the Reaeration Process of Turbulent Water

在实验水槽中 ,通过测量水体中溶解氧浓度的变化 ,研究不同搅拌速度、搅拌头处于不同水深情况下的复氧过程 ,以及紊动水体中中性盐和有机物对复氧的影响 ,并在表面传质系数分析的基础上 ,摸拟计算复氧系数 k2与水深H的关系。结果表明 ,水体内溶解氧量不仅取决于水气介面传质速率 ,而且也与水体内氧的扩散有关 ,紊动水体的复氧过程更与表面紊动动能有关 ;中性盐的存在对复氧影响较小 ,而葡萄糖则明显降低复氧速度。

The dissolved oxygen concentration in the water body is one of the most important indicators that can be used to evaluate the water body polluted by organic matter.The reaeration process and reaeration velocity play key roles in the transfer, diffusion and purification process of organic pollutants.This paper describes researches on the reaeration process of turbulent water body as well as the effect of neutral salts and organics in turbulent water on the reaeration of experimental scale.The relationship between the reaeration coefficient k 2 and water depth H is simulated and calculated based on the analysis of interfacial mass transfer coefficient.