Numerical Simulation Of Flow Field For Horizontal Grinding Stirred Mill And Its Study On Comminuting Mechanism

Stirred media mill is one of the ultra-fine grinding equipment which have high-energy utilization rate and application prospect. It plays an important role in mineral ultra-fine grinding processing. Now more and more scholars pay more attention to the subject of study in decreasing produce cost and increasing the production efficiency of Stirred media mill. The factors that influent the Stirred media mill of grinding effect have a lot, to find out major factors as well as these factors how to affect grinding effect, we need to study its flow field first. This program gets certain professional powder processing equipment company's entrustment, to find the way of raising grind machine exceed grinding effect and increasing cost. For that we must have a through understanding of its essential flow characteristics. Considering huge cost and long period by field measuring, take numerical simulation method to analyze flow characteristics of the ultra-fine stirred mill in the paper.On the basis of the structure and working principle of ultra-fine stirred mill, using the powerful function of UG software construct 3-D model of the flow fields first. Through numerical simulation, analyze the partial performances of the flow fields, and on this foundation study its comminuting mechanism deeply. Here are the main points:(1) Have gathered domestic and international in the research in the aspect of mill, have looked ahead future develop direction, have introduced to the method of numerical simulation about flow fields in ultra-fine stirred mill.(2) Using 3-D modeling UG software carry out modeling of the flow fields, Then, according to grid generates technology, Gambit, the pre-processor of FLUENT, is used to generate the mixing mesh for the whole flow fields, complete pre-treatment for the numerical simulation.(3) Based on the steady state of laminar flow, using FLUENT software to simulate the whole internal flow field. After analyzed velocity gradient, shear rate dispersion of flow field and so on, we found the main comminuting area, and get the following conclusion:the comminuting mechanism is different in different flow field. Through doing some contrast simulation by using different velocity, indicated that large velocity gradient had good grinding effect.(4) Under the condition of rotational speed, it is turbulent state to stir mill machine inside to flow out site. Using FLUENT software, simulate turbulent flow field in ultra-fine stirred mill. It is visual to have shown its inside to flow out site. Get the Contours of Relative Velocity Magnitude, Contours of Turbulent Kinetic Energy and Contours of Turbulent Dissipation Rate. According to its calculation do preliminary explore for stiring mill machine turbulent site. Research result have offered certain theoretical basis for developing high speed stir mill machine, and have certain guidance meaning to producing practice.(5) On the basis of the simulation results, the paper analyzed the comminuting mechanism of the ultra-fine stirred mill in detail. The following are the conclusions:the powder is comminuted by rubbing, impacting and shearing. Attrition comminution is the main mode of the ultra-fine stirred mill. Finally conclude the corresponding experience, bring forward improve measures and the next task.