Numerical Simulation Of Three-Dimensional Flow Field In Mechanical Stirried Reactor

Mixing equipments are widely used in many industry processes. The mechanical stirred reactor is necessary and important in chemical industry and water treatment to mix different fluid, disperse different gas, suspend solid phase and promote heat and mass transmission. Nowadays the lectotype of stirred reactor and design of interior component mostly depend on experiments and experience. The farther information about the field is little. The design can not be applied when the structural parameter and operation condition change. The stirred reactors designed unreasonably not only reduce the mixing effect in industry processes, but also waste the valuable energy.These days the computational fluid dynamics (CFD) is applied more and more in the mixing research. It can simulate the flow field of new structural and different operational stirred reactors. The CFD technology is able to not only review the local inner mixing situation in the reactor, but also make the computational result visual, which avoids the heavy and complicated experiment, provides reliable reason for the optimization of the stirred reactors.This paper uses the software FLUENT to simulate the three dimension flow field of mechanical stirred reactor. This paper uses the software FLUENT to simulate the three dimension flow field of mechanical stirred reactor. The distribution of velocity and turbulence intensity in the flow field and the effect of the baffle to the vortex are analysed. The computation results of the power are compared with the one of the theoretical derivation. According to the change of the diameter and the span of the blade, the effect of the diameter and the span of the blade to the mixing effect are analysed. Based on the analysis, it can be get that RNG k -εturbulence model is able to simulate the flow field in the mechanical stirred reactor. The experimental and stimulant results are matching through the contrast. As the periodic action of the blades and baffles the flow field is also periodic. The baffle makes the vertox between the two baffles and the shaft, which enlarges the turbulence intensity of field and promotes the microcosmic mixing effect. But the baffle increases the energy wasting. For saving energy the diameter of blade should be cut short as soon as possible when the mixing effect satisfies the technics. The span of the blades hardly affects the power, the velocity and turbulence intensity of the flow field. But the span mainly affects the distribution of the field, and reasonable span makes the mixing effect better of the diffusion. The research has some guide to the design and operation of the mechanical stirred reactor.