Reaction-Diffusion-Convection Spatiotemporal Patterns In The Hydrogen Peroxide-Iodine-Containing Species Reaction Systems

The coupling effect of reaction and transport is a necessary condition for the generation of various spatiotemporal self-organized structures.The transport process can be divided into convective flow and diffusion,which couple with nonlinear chemical reaction can produce abundant spatiotemporal dynamics.This paper takes the reaction system of hydrogen peroxide-iodine species as the research object,explores the reaction-diffusion-convection spatiotemporal self-organization structure among the reaction systems,for the purpose of obtaining the relationship between pattern formation law of iodine patterns and reactants initial concentration.First,the changes of physical parameters such as temperature,density and surface tensions during reaction process of the Briggs-Rauscher reaction are studied under a closed reactor.Based on the above analysis,the convective patterns and its evolution laws which induces by the interaction of Rayleigh convection driven by buoyancy and Marangoni convection driven by surface tension are systematically investigated In this paper,it is found that the B-R reaction can produce three-stage convective pattern（branch structure、high iodine stage and rotating branch structure）.The layer thickness and initial concentrations affect pattern structures and induction period.Secondly,in the Bray-Liebhafsky reaction system,it is only found the branch transient structure and the rotating branch structure which is influenced by the layer thickness and initial concentrations.Finally,the convective pattern in the H₂O₂-KI reaction system is explored,which shows high iodine states and rotating branch structures.The layer thickness and concentration have a more obvious effect on the convective pattern in Pattern II.Therefore,the convective pattern generated actually by the continuous production and consumption of I₂.In summary,this paper first systematically studied spatiotemporal self-organization structures and the evolution laws in the hydrogen peroxide-iodine species reaction（B-R、B-L and H₂O₂-KI reaction）,which make a good base for further research such as kinetical analysis,theoretical simulation and pattern control.The study of reaction-diffusion-convection patterns not only enriches the convection structures,but also has important significance for the study of nonlinear dynamics.In particular,it provides a new model system for rotating chirality design and theoretical research.The dissertation has 37 pictures,5 tables,and 110 references.