连续微流体搅拌器中高黏度流体混合性能的数值模拟OA

To solve the insufficient mixing problem of high-viscosity fluids in stirrer,the continuous microfluidic stirrer based on high shear and efficient mass transfer principle was proposed.The orthogonal analysis method was used to investigate the structural parameters of the single-stage stirrer and the enhancement effects on medium mixing.The optimal parameters for the single-stage micro-stirrer were determined with impeller diameter of 30 mm,impeller height of 30 mm,8 blade and blade installation height of 5 mm above the bottom.The internal flow field and the mixing characteristics of high viscosity fluids with different mass fractions were investigated by the numerical simulation methods.The axial velocity distribution,radial velocity distribution,mass fraction distribution,and the relationship between mixing intensity and axial distance were obtained under various stirring speeds.The results indicate that increasing the rotational speed enhances the intensity of the main circulation zone within the tank,and the distribution range of the high-speed flow region in the mixing tank correspondingly expands.Elevating the concentration of high viscosity fluid reduces the main circulation range of the flow field,which leads to the decrease in mixing intensity at the outlet.Therefore,it is advisable to choose micro-stirrer with three or more stages or increase the stirring speed to facilitate the mixing of high viscosity fluids.