Smash Theory Research And Development Of Computer Simulation System Of Jet Milling Process

Jet milling process is an important method of ultra-fine particle preparation, which plays an important role in the ultra-fine particles preparation field. For different types of material,the milling cases are different as a number of parameters of the milling process have an impact on the milling results. Most research on the jet milling process is still in its infancy and there is still not a single jet milling which is capable of dealing with all kinds of particles at present. Through introducing the computer visual simulation technology into the jet milling process, a computer visual simulation system of jet milling process is built which is universal to various kinds of materials; Furthermore, to some extent, both theoretical and practical basis for the future research is also provided.First of all, the paper introduced some basic concepts and theories of jet milling process and computer simulation technology. It put forward and proved that the particle behavior in the jet milling process is consistent with the fractal theory, and the particle behavior in the jet milling process can be described by the fractal theory. In order to realize optimized effects of jet milling operation and visualization grinding process, a computer simulation system of jet milling process is built based on the traditional energy theory and finite element analysis technology, combined with the fractal theory.A methodology of the establishment of a jet milling process computer simulation system is also proposed in the paper, including three types of analysis models of jet mill process:target plate type, flow bed type and flat type. These models have a certain degree of universality to the materials in jet milling process. The specific analysis methods of jet milling process is determined, and three types of jet milling machines, i.e. target plate type, flow bed type and flat type are analyzed with the LS-DYNA system featured ANSYS software.After research on simulation experiments, the mathematical relationship between the particle size, grinding feed rate, and the fractal dimension of different kinds of materials is researched, and equations among the three are concluded. The paper put forward that the percent of particle number could be replaced by the velocity ratio, i.e. the rate loss of part particles could be replaced by the rate loss of the whole particle flow in proportion and the result is proved through experiments. A methodology of the establishment of a simulation display system of the jet milling process is proposed; in addition, aggregation behavior of particles in jet milling process is described with the fractal theory in the paper. Simulation display models of target plate type, fluidized bed type and flat type of jet milling are established with 3ds-max software, and a material library consisting of different kinds of material particles is established. After a comparison between simulation results and the actual grinding results, the applicability of the simulation system for different kinds of particle and the reason why a calculation error occurred is analyzed. Through the comparison, the error range of calculation for different kinds of materials, a variety of experience values of broken work for different kinds of particles, and dozens of empirical parameters are all concluded.