Influence of the structure of horizontal single-shaft kneader on fluid flow and mixing characteristics
To further study the fluid flow and mixing characteristics in the horizontal single-shaft kneader,the finite element method(FEM)and particle tracer technique were combined to study the flow and mixing processes of highly viscosity Newtonian fluid in a horizontal single-shaft kneader with different structures by numerical simulation.Firstly,the FEM was used to simulate the flow process of fluid in kneader with different structures,so as to analyze the influence of kneader structure changes on the fluid velocity distribution,shear rate distribution and mixing index distribution.Then,particle tracer technology was used to analyze the mixing process of fluid in kneader with different structures,so as to explore the influence of kneader structure changes on the fluid distributive mixing process,length of stretch and mixing efficiency.Results show that the experimental results of distributive mixing are in good agreement with the numerical simulation results;the area of high velocity and shear region increases with the increase of kneading bars side length;the proportion of mixing index distribution greater than 0.7 in the kneader firstly increases and then decreases with the increase of the number of static kneading bars and the length of kneading bars;increasing the number of static kneading bars is beneficial to strengthening the distributive mixing process;the average length of stretch increases with the number of static kneading bars and the side length of kneading bars;the average time average mixing efficiency firstly increases and then decreases with the increase of the number of static kneading bars,and increases with the increase of the length of the side of the kneading bars.The influence law of kneader structure changes on fluid flow and mixing characteristics obtained can provide theoretical guidance for design and optimization of horizontal single-shaft kneaders.
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