Abstract: A visualization system based on microscopy，photoelectric imaging analysis and digital processing was developed to investigate the micrometer-level mass transfer process of polyvinylpyrrolidone（PVP）across the interface of dichloromethane-water.The concentration-gray scale standard curves were obtained by measuring the gray scales of the images of 10 PVP dichloromethane solutions with different concentrations.The concentrations of PVP corresponding to different times were determined by measuring the gray scales of the images of PVP dichloromethane solutions at the corresponding times.The mass transfer kinetics curve of PVP across the interface of dichloromethane-water was then obtained.In addition，the evolution of flow field in the dichloromethane phase near the interface was observed and analyzed via the visualization system.

摘要： 应用光电显微技术和数字图像分析技术，在微米级视场空间中,对聚乙烯吡咯烷酮（PVP）在二氯甲烷-水界面传质的非平衡动力学过程进行了可视化研究。对拍摄的10个不同浓度的PVP二氯甲烷溶液的图像进行灰度分析，建立了PVP二氯甲烷溶液的浓度-灰度标准曲线。通过测量不同传质时刻的PVP二氯甲烷主体相图像的灰度值，得到对应的浓度值。根据传质过程中二氯甲烷相中PVP的浓度随时间的变化关系，建立了PVP在二氯甲烷-水界面传质动力学曲线。观察并分析了油相近界面流体流型随时间、空间的渐变过程。