Flow field multi-scale analysis of impinging stream reactor for preparing nano copper powder process

In the experiment system of preparing nano-copper powder in impinging stream reactor, there is an association between particle size distribution and flow mixing scale. The strengthened preparation process in liquid-continuous impinging streams reactor (LIRS) was analyzed by numerical computation from multi-scale standpoint. The results show that the large-scale convection is driven by rotating blades, the medium-scale turbulence diffusion intensity and turbulent viscosity are associated with velocity gradient,and small-scale viscosity diffusion is similar with that of medium-scale turbulent diffusion. LISR provides the reaction system with a strong pressure fluctuation zone, in which the micro reaction system can quickly be realized and promoted with the energy transfer and conversion. The remarkable turbulent viscous diffusion can effectively accelerate the fluid more uniform and be conducive to the reaction system. The multi-scale analysis of the flow field above has guiding significance for the optimization of the latter preparing of the impinging stream technology of nano-copper powder reaction system.