搅拌釜反应器内流体流动的CFD数值模拟.pdf

搅拌釜反应器内流体流动的CFD数值模拟 93 [102]S. Jain. Three-Dimensional Simulation of Turbulent Particle Dis -persion[D]. Utah:University of Utah,1995. [103] and . Turbulent dispersion of particles using eddy interaction models[J]. Flow,1996,22(1):157-175. [104]Gosman, A. Ioannides, E. Aspects puter simulati -on of liquid-bustors[C]. Paper AIAA-81-0323, prese -nted at AIAA 19th Meeting, in St. Louis,MO:1981 [105]樊建人, 赵华,芩可法. 气固两相流动的湍流脉动扩散数学模型及其应用[J]. 应用力学学报,1990,7(1):50-55. 符号说明 T-釜直径(=液面高度),mD-桨直径、mr-距釜中心轴距离(半径),miR-桨半径,mz-距桨平面高度(指向釜底为正),mV-平均速度,1ms??kσ-湍动动能Prandtl数εσ-耗散频率Prandtl数N-搅拌转速,rpstipV-叶端速度,1ms??k-湍动动能,22ms??ε-能量耗散速率,23ms??PN-功率准数搅拌釜反应器内流体流动的CFD数值模拟 2 Abstract Stirred tank reactors are extensively used in a variety of industries like the paper and pulp, pharmaceutical, fine chemicals, food industry, petroleum chemical engineering, pharmacy and biochemical engineering etc. In designing such reactors, understanding the fluid dynamics is critical particularly. Untill recently, dimensionless numbers and empirical correlations have been used as tools for design, scale-up and operation of stirred tanks. Since the turbulent three-dimensional flow of single or multiphase fluid plex in stirred tanks, these dimensionless numbers and empirical relations are clearly inadequate. Some researchers have given some simplified mathimatical models , but these models intensively depend on experimental data. To fully understand the processes occurring in stirred tanks, mathematical modeling of local hydrodynamic behavior are desired in depth. This thesis is devoted to the above tasks on the basis putational fluid dynamics (CFD ). In accordance with the anisotropic feature of turbulent flow, an anisotropic reynolds stress model (RSM) is adopted to predict the turbulent flow field and turbulent characteristics generated by a Rushton disc turbine with the sliding mesh iterative procedure. The discretization scheme