The aim of this paper is to study the enhancement mechanism of adsorptive particles on gas-liquid interfacial mass transfer. A quantitative model for predicting enhancement factor is proposed based on film model and interfacial non-equilibrium model, in which the enhancement factor depends mainly on the surface fractional coverage θ and the solute bulk concentration C_b, the interfacial concentration of liquid C_I is dependent of the mass transfer coefficient k_l and C_b, and usually is far from the equilibrium concentration with gas phase at the interface. The surface fractional coverage θ is a function of particle property and operating condition. The present model divided the enhancement into two regimes: particle-transport-controlled regime and surface-adsorption-controlled regime. The increase of gas-liquid mass transfer rate in the presence of adsorptive particles could mainly attributed to the surface adhesion of particles, the enhancement factor is an increasing function of surface fractional coverage θ but a decreasing function of the solute bulk concentration C_b, which well explains the effects of particles concentration and stirring intensity on enhancement factor. The prediction values of present model are at considerably good agreement with experimental data.

本文的目的是研究吸附颗粒对气液界面传质的增强机理。提出了基于薄膜模型和界面非平衡模型的定量预测增强因子的模型，其中增强因子主要取决于表面分数覆盖率θ和溶质体积浓度C _b，而液体C _I的界面浓度则取决于传质系数k _l和C _b的常数通常远离界面处气相的平衡浓度。表面分数覆盖率θ是颗粒性质和操作条件的函数。本模型将增强作用分为两种状态：颗粒传输控制的状态和表面吸附控制的状态。气-液传质速率的吸附性颗粒的存在下，增加可能主要归因于颗粒的表面粘附力，增强因子是表面覆盖度的递增函数θ但溶质体浓度的递减函数Ç _b，其很好地解释了颗粒浓度和搅拌强度对增强因子的影响。本模型的预测值与实验数据相当吻合。