Numerical Simulation and Flow Field Analysis of Horizontal Kneader
Zheng Jin, Wu Bin, Chen Kui, Ji Lijun, Wu Yanyang
School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
Abstract：The computational fluid dynamics software Fluent was used to simulate the movement of viscous materials in the kneader, and the internal flow field of the horizontal double Σ blade kneader as a viscous reaction kettle was analyzed and discussed.Through preliminary analysis of equipment and material characteristics, the Laminar model was selected as the laminar flow model, the standard k-εmodel was used as the turbulence model, and the multiple reference system method was selected for the dynamic and static regions. On this basis, the characteristics of the speed distribution, pressure distribution and stirring power consumption of the materials inside the kneader were investigated respectively, and the specific effects of conditions such as liquid viscosity, stirring speed and the installation height of the stirring blade were analyzed. The results show that the viscosity range of the liquid material that the kneader is suitable for processing is 1 - 20 Pa·s, within this range, the axial mixing and radial mixing of the liquid can reach a more ideal state. The speed of the stirring paddle improves the radial mixing more obviously. Increasing the installation position of the stirring blade can reduce power consumption to a small extent, but it will weaken the internal pressure difference of the kneader and affect the stirring and mixing. Therefore, it is not suitable to increase the installation position of the stirring blade to save power. The stirring power will increase with the increase of liquid viscosity. It increases linearly and is proportional to the 2.08 power of the stirring speed.
Keywords：computational fluid dynamics; kneader; speed; pressure; stirring power
Zheng Jin，Wu Bin，Chen Kui，et al. Numerical simulation and flow field analysis of horizontal kneader[J]. Engineering Plastics Application，2021，49(6)：101-106，112.