Numerical Simulation And Experimental Study On Mixing Of Mechanical Stirred Tank

With the continuous development and progress of the industry,the mechanical stirring tank has been widely used in many fields of industry,especially in the chemical industry,food,metallurgy,papermaking,and water treatment industry,the mechanical stirring tank is one of the most widely used chemical equipment.According to different industrial requirements,the mechanical stirring tank is widely used in the media mixeddissolved preparation of suspension,promote mass transfer and heat transfer enhancement.the preparation of suspension,promote mass transfer,heat transfer and other operations.However,most of the current design and production of mechanical stirring tank rely on the experience,lack of understanding of the stirred tank design parameters,mixing rules,lack of intuitive understanding of the mixing process,that can not guarantee and meet the different industrial requirements.Along with the development of computer fluid dynamics(CFD)software,the mixing process of numerical simulation has become a reality,the mixing process of stirred tank was simulated with CFD software,can be intuitive understanding the effect of mixing process,can greatly reduce the design cost of stirred tank,has a certain promoting effect on the design parameters of the stirred tank.In this paper,CFD software is used to simulate the square stirred tank and the circular stirred tank,and the transient numerical simulation is performed by using the RNG k-?turbulence model,the component transport model and the sliding mesh model.The single factor simulation of the blade angle of the stirring tank,the height of the blade from the bottom,the width of the blade,the diameter of the blade.According to the result of single factor analysis and 5 factors 4 levels orthogonal numerical simulation analysis,based on the mixing time,stirring power and unit volume can comprehensive evaluation agitation tank mixing effect,and the structure of different mixing tank parameters put forward reasonable suggestions.The results show that the maximum stress received by the blade is much smaller than the permissible stress value of the material,which can ensure the normal operation of the optimal combination blade.Analysis of one-way coupled statics of optimal parameter combination of stirred tank,found that the maximum stress in the blade blade connected with the stirring shaft,the blade and the maximum force is far less than the allowable stress value.The result can ensure the normal operation.Change agitation tank Angle of blade,blade from bottom height,speed and other parameters for actual experiments,using electrical conductivity sensor measuring conductivity value after the conversion formula for the solution density,and the simulation experiment,comparing the density of the same position monitoring Through curve correlation,mixing time,solution concentration,unilateral found the simulated data and experimental data,the trend of basic mixing time,concentration of the final error were similar.