以Fick定律和不可逆过程热力学为基础，结合文献中对扩散系数预测模型的分析，提出了一个氨基酸在水溶液中扩散系数预测的半经验模型。用实验测定的7种氨基酸在水溶液中的扩散系数和一些文献中的扩散系数数据对模型参数进行了拟和。利用该模型对多种氨基酸及尿素在水溶液中的扩散系数进行了计算，计算值与实验值的平均相对误差均小于0.6%。

界面湍动对相际传质具甫重要影响。利用显微激光垒息干涉技术研究了CO2在乙醇一水溶液中吸收过程的界面湍动情况。实验观察界面湍动强度与溶液浓度的关系。结果表明，乙醇浓度越高，界面湍动强度越大，文中对此进行了分析和讨论。

针对分散相微粒增强难溶气体的吸收过程，本文提出了一个一维非稳态非均相传质的二区模型，并进行了理论求解。根据表面更新理论，得到了增强因子的数学表达式。利用恒温反应釜，对活性炭/水浆料中发生的CO2吸收过程进行了实验研究，测定了不同颗粒浓度及转速下的增强因子。实验结果与模型预测值吻合良好，表明本文模型具有很高的预测精度。

The diffusion of amino acids in aqueous solution was investigated experimentally by a holographic interferometric technique where the real-time holographic interference fringes indicating the concentration profiles of the liquid were obtained by an automatic photographing and memorizing program. The reliability of the instrument was verified by the measurement of the diffusion coefficient of KCl and sucrose in aqueous solution at 298.15K. Furthermore, the diffusion coefficients of glycine, L-alanine, L-valine, L-isoleucine, L-serine, L-threonine, and L-arginine in aqueous solution at 298.15K were measured, and the affecting factors of molecular structure and polarity were analyzed and discussed. In addition, on the basis of the Gordon model of the diffusion coefficient in the literature, a new semiempirical model was proposed to predict the liquid diffusion coefficients of amino acids in aqueous solutions. The equation parameters were fitted by the experimental data of seven amino acids in this work and four in the literature.

Laser Doppler Anemometer has been used to measure the flow field characteristics near the interface around a moving bubble in the presence of ultrafine particles. In order to model a moving bubble the bubble was fixed into the counter-flow liquid by a metal mesh. Experimental materials are air and water and the parti-ties are complex oxidate powder. Experiments were carried out under the operating conditions: the liquid flow velocity Uo is 12.6cm/s, the equivalent diameter d, is 0.6cm, the mass concentration of particle is 0.2%, the average particle diameter is about 10mm and the density is 2g/cm3. The velocity profiles of both frontal and tail-vortex areas were measured respectively. The experimental results show tllat the velocity fields RIFe obviously changed in the existence of particles. In the frontal area of the bubble both tangential and normal velocities de-crease due to the presence of particles, but in tail vortex area, the tan gential velocities increase remarkably and normal velocities rise gradually from the center towards the fringe in the opposite tendency to that of no par-ficles. The influences of flow field change in the presence of particles on gas-liquid mass tran sfer are analyzed and discussed.