Study On Simulation Of Fluid Danymic In Stuctuerd Packed Tower

The technological process of the boron isotopes separation by chemical exchange method in the pilot scale is done in our group. A strict separation standard is required in the process, which leads to a rather high height of filled tower. According to that, two new style of wire gauze structure packing CDG1700Y and CDG2500Y were chosen. Their fluid dynamics performance and mass transfer performance were studied propaedeutically. Based on the former researches, a further study on the simaltion of dynamic flow in a structured packed tower is taken in this paper, which supplies reference for the researches in the future.According to the definition of the Representative Elementary Unit (REU), the volume averaging technique was applied to make the discrete media to be continuum in structured packed tower. Then the flow equations for discriping the dynamic flow in packed tower under single-phase flow and two-phase flow conditons were derived.The software Fluent6.1.22 is used to do studies on the simulation based on the continuity equation and momentum equation derived above. A three-dimensional CFD model is built as a physical model in the simulation. And porous medium model, multiphase flow model, Euler model and user define function model in Fluent are chosen to simulate the dynamic flow under the two conditons respectively. The results of simulation, such as pressure profile and velocity vector profile, in differ sectional of the tower are given, which can represent the flow behavior well in the packing tower.To test the calculated result, an experiment measuring the differential pressure in the structured packed tower under the single-phase condition is done. The comparison indicates that the equations derived in this paper are confirmed very well with the experimental flow patten, and the relative deviation of the differential pressure per meter of filling is 18.94%. Under gas-liquid two phase flow condition, the experimental data from referenced literature of differential pressure is adopted to test the calculated result, and the relative deviation is 26.69%.