中文摘要：

建立了采用激光诱导荧光技术观测水吸收CO_2过程中界面对流现象的实验装置,利用荧光素钠作为荧光剂,通过标定获得了CO_2在水中溶解浓度与荧光强度的关系,进而获得了定量测量水中CO_2浓度分布的实验方法。通过建立的实验装置和方法,测量了水吸收CO_2过程中液体近界面Rayleigh对流发生时的浓度分布演化过程。利用实验结果对文献中报道的临界Rayleigh数进行了验证;并对上述吸收体系的界面传质由分子扩散主导逐步转变为对流传质主导的过程,以及Rayleigh对流对吸收过程界面传质的强化进行了定量分析。

英文摘要：

An experimental apparatus based on laser induced fluorescence（LIF） technique for measuring interfacial Rayleigh convection in process of water-CO_2 absorption was established. By fluorescein sodium and a calibration process, the correlation between the fluorescent light intensity and the concentration of CO_2 in water was obtained, and thus an LIF method of quantitative measurement of CO_2 concentration in water was established. By established installation and method, the concentration distribution evolution for the Rayleigh convection developed near the surface of water in the water-CO_2 absorption process was investigated. Validation of the measurement results was made by checking with the critical value of Rayleigh number reported in literature. The experimental results were also used to analyze the transition mass transfer regime from molecular diffusion to convective diffusion, and the enhancement effect of the interfacial Rayleigh convection on the mass transfer process.