Study On The Mixed Law Of Two Inert Gas Diffusion

In industrial production and daily life, the diffusion and mixing of two gases or different gases is very common. At home and abroad there’re a lot of studiesto gas or aerosol diffusion and mixing problems, one of the hot spots of Chinese and foreign scholars focus on the small molecules in the polymer or other porous medium diffusion, diffusion of single gas in the air, or flow field for a single gas, but rarely involves diffusion problems between two gases or different gases in the sealed space, for different gas diffusion problems discussed in space after the pressure released is ever less. In this paper, for the first time problems of gas diffusion and mixing under high pressure are discussed,expand the gas diffusion research means, and has guiding significance to the radiochemical analysis.This thesis takes the study on the diffusion and mixing of Kr and Xe in the radiochemical analysis as a starting point, using computational fluid dynamics (CFD) technology, carrying on the discussion of different gases in sealed space under high pressure shock conditions. Simulation results showed that:in the same space, the releasing pressure of two kinds of gas diffusion is higher, the mixing time is short; under the same releasing pressure in different space, the greater the space complexity, the greater the space, the mixing time is long.Through this research, not only on the field test of the corresponding conclusions have been obtained for the diffusion of the problem, two kinds of gas in the large space also has reference significance, verifying the feasibility of methods and concepts of the computational fluid dynamics technology, gas diffusion coefficient, mixing uniformity and pressure inlet-mass flow inlet switching method in the research on the issue.