There are stilllimited experimental data of liquid diffusion coefficients in literature. Therefore, the experimental investigation and prediction model are of practical and theoretical significance. The diffusion coefficients of L_serine, L-threonine, L-arginine, in aqueous solution at 298.15K were measured respectively by holographic interferometer. The affecting factors of molecular structur and polarity were analyzed and discussed. Finally, a modified semi-empirical model for correlating the diffusion coefficients of solid organic compounds in aqueous solutions at 298.15K was proposed with an adjustable parameter added. The average deviation between model prediction values and experimental ones is less than 0.2, which shows a considerably satisfactory accuracy.

The influence of two diferent sturfactants on gas-liquid mass tranefer were studied by using the real-time micro-holographic interference technique, Through direct observation of interfacial turbulence and the measurement of conteentration neat the interface, mechanism on the influence of surfactant on gas-Liquid mass transfer was discussed.

Absorption of gaseous species into stationary droplets is a fundamental interest of mass transfer between liquid droplets and ambient gas, which plays a key role in atmospheric environment control and many indus trial applications. In this paper, two different considerations including equilibrium and non-eq uilibrium relations at the interface are used to analyze and predict the absorption time for a physical absorption at a relatively low so lubility of gas. For the equilibrium pattern, in the beginning period of absorption, the mass transfer rate is considerably rapid and afterward becomes slower and slower and finally comes to almost zero as the droplet concentration closes to the saturated value. Diferently, when the non-eq uilibrium model is adopted, the interfac ial concentration increases grad ually with the bulk concentration of liquid droplet, and the absorption rate mildly decelerates with the increase of bulk one throughout the process, which lead s to a longer absorption time. Bas ed on the difus ion eq uation of species, the concentration distribution within the droplet at ditierent times is computed. A solution for CO2 abso rption into a small water droplet is given.

利用显微激光全息干涉法研究了第三组分对气泡传质的影响. 第三组分分另选择了几种不同类型的表面活性剂. 结果表明，加入微量的表面活性剂，气泡传质时的近界面浓度将发生显著变化。

A micro-holographic interferometer of two-wavelength lasers has been designed and constructed. The concentration profiles close to the interface of 1iquid side were successfully measured for multicomponent gas-liquid mass transfer. It was discovered that the measured concentration at fldistance 0.0lmm away from the interface was far from the thermodynamic equilibrium value, and thus flsteep concentration gradient existed near the interface. The turbulent phenomena near the interface during interphase mass transfer were noted by experiment. The turbulent intensity and time were related to the composition and the components of the system to be studied, and also affected by the velocity of each phase. The concentration field near fronta1 interface was different from that of tai1-vortex area for the mass transfer around a bubble.