| As a novel reactor, rotating packed bed has been explored and found applications in various industrial fields. However, the characteristics of mixing and reaction in the micro-scale liquids are rarely studied yet hitherto, and the reactive mechanism of micro-mixing and diffusion on the packed wires in RPB are not clarified as well. Hence, study on the micro-mixing of turbulent flows in RPB is of great help to build the reactive mechanism in related field. Meanwhile, the mechanism of diffusion and behavior of the micro-scale liquids could provide improvement on the model of species transfer within the liquid films.On the basis of prior studies, and knowledge of fluid flow in RPB, some basic assumptions are adopted to establish the physical model. The computational procedure involves the concurrent flow process of the two liquid streams in the pack space and the separated flowing process around the packing wires. The mixing process by the breakage between the wire and liquid film is taken into considered to study the influence of micro-mixing on the reactive species transfer.The exploration on the micro-scale transport phenomena in RPB is of significance to understand the mechanism of micro-scale mixing and chemical reaction therein. Numerical simulation is carried out to obtain reactant concentration, product concentration and segregation index from different volume rates. The film thickness is obtained indirectly by comparison between experimental and numerical results. Appropriate modification on the rotational component of the velocity of the liquid film is proposed and the numerical results are in reasonable agreement with the experimental ones. The fluid flow and the species transfer with a parallel reaction are studied to obtain the evolution of the segregation index, the turbulence dissipation rate and the micro-mixing time with the rotational speed.It is evidenced that there exists different regions of micro-mixing at different rotating speeds, ie. a clear fractal phenomenon is seem to be clarified primarily. It can be deduced as Two-Region or Three-Region Theory. The changes of segregation index from the layers are also different. Present study advances the understanding of the micro-mixing in RPB will provide a solid base for the further study. |
