Theoretical And Experimental Study On Micromixing

Micromixing is generally refered as the homogenization process of fluids from their smallest scale of turbulence (Kolmogorov scale) to the molecular scale. Its influence on fast, multiple chemical reactions is especially significant. Though the mechanism and performance of micromixing have recieved much attention since 1950's, the problems are not yet solved satisfactorily. Fundamental study on the intrinsic behavior and quantitative description of micromixing are needed to explore the reality of micromixing process. In the present work three aspects are included:(â… ) A summary of the previous studies;(â…¡) Elucidation of mixing mechanisms on different scales in the light of turbulent theory, formulation of the process and providing corresponding models;(â…¢ ) Application of high speed stroboscopic micro photography, numerical simulation and chemical reaction experiments to study the micromixing process.The aim of this thesis is to establish a rational and distinctive theoretical framework on mixing and chemical reaction on the basis of turbulent theory and the data of specially designed experiments. The main works and results are outlined as follows:1. Inadequacies of previous models about the morphology of materials during mixing at the meso scale were pointed out. Experimental results obtained from high speed microphotography showed that the material elements exhibit...