Major-Godlewska Marta, Karcz Joanna
Department of Chemical Engineering, West Pomeranian University of Technology, Szczecin, al. Piastów 42, 71-065 Szczecin, Poland.
Chem Zvesti. 2018;72(11):2933-2943. doi: 10.1007/s11696-018-0533-4. Epub 2018 Jun 13.
The results of the power consumption for an agitated vessel equipped with vertical tubular baffles and high-speed impeller are presented in the paper. Aqueous solutions of CMC were agitated within transitional range of the non-Newtonian liquid flow in the agitated vessel of inner diameter equal to 0.6 m. Eight different types of the impellers were tested: Rushton or Smith turbines, turbine with straight blades, pitched blade turbines and propeller. The tubular baffles of outer diameter were located in the position from the vessel wall. Different configurations of baffles, arranged around the vessel circumference singularly or blocked in the modules, were considered in the study. In total, 180 different tubular baffles-impeller systems were tested. The measurements of the torque were conducted by means of the strain gauges method. Based on the power characteristics obtained for each impeller type, the effect of the geometrical parameters of the vertical tubular baffles on the power number was determined and discussed. The results show that geometry of the tubular baffles mostly affects the power number for the system with radial flow Rushton turbine. Moreover, power numbers decrease with the increase of the clearance between baffle and vessel wall for the systems, in which the radially axial circulation of the liquid is promoted. The dependences of the power number on the geometrical parameters of the vertical tubular baffles arranged singularly around the vessel circumference were described by means of the Eqs. (5)-(16). These equations can be useful in the project computations.
本文介绍了配备垂直管式折流板和高速叶轮的搅拌容器的功耗结果。在内径为0.6米的搅拌容器中，对羧甲基纤维素（CMC）水溶液在非牛顿液体流动的过渡范围内进行搅拌。测试了八种不同类型的叶轮：Rushton或Smith涡轮、直叶片涡轮、斜叶片涡轮和螺旋桨。外径为 的管式折流板位于距容器壁 的位置。研究中考虑了围绕容器圆周单独布置或成组阻塞的不同折流板配置。总共测试了180种不同的管式折流板 - 叶轮系统。通过应变片法进行扭矩测量。基于每种叶轮类型获得的功率特性，确定并讨论了垂直管式折流板的几何参数对功率数的影响。结果表明，管式折流板的几何形状主要影响径向流Rushton涡轮系统的功率数。此外，对于促进液体径向轴向循环的系统，功率数随着折流板与容器壁之间间隙的增加而降低。通过式（5） - （16）描述了围绕容器圆周单独布置的垂直管式折流板的功率数与几何参数的关系。这些方程在工程计算中可能有用。
