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›› 2014, Vol. 14 ›› Issue (5): 744-750.

• 流动与传递 • 上一篇    下一篇

改进型INTER-MIG搅拌槽内固液悬浮特性的数值模拟

周勇军 卢源 陈明濠 梁家勇   

  1. 南京工业大学机械与动力工程学院 南京工业大学机械与动力工程学院 南京工业大学机械与动力工程学院 南京工业大学机械与动力工程学院
  • 收稿日期:2014-07-14 修回日期:2014-09-26 出版日期:2014-10-20 发布日期:2014-10-20
  • 通讯作者: 卢源

Numerical Simulation of Solid-Liquid Suspension Characteristics in a Stirred Tank with Improved INTER-MIG Impeller

ZHOU Yong-jun LU Yuan CHEN Ming-hao LIANG Jia-yong   

  1. College of Mechanical and Power Engineering, Nanjing University of Technology College of Mechanical and Power Engineering, Nanjing Tech University College of Mechanical and Power Engineering, Nanjing University of Technology College of Mechanical and Power Engineering, Nanjing University of Technology
  • Received:2014-07-14 Revised:2014-09-26 Online:2014-10-20 Published:2014-10-20
  • Contact: LU Yuan

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被引次数

20

摘要： 应用CFD软件Fluent 12.0和并行计算机工作站对双层改进型INTER-MIG桨式搅拌槽内的固液悬浮特性、临界离底悬浮转速及功率消耗进行数值模拟，分析了在固体体积分数as=30%下，转速n、桨叶离底距离C1和桨间距C2等因素对搅拌槽内颗粒悬浮特性的影响. 结果表明，在一定的转速和桨径下，改变C1和C2会改变流场的局部结构，选取适合的C1和C2可使固液混合更均匀，有利于颗粒悬浮和整个搅拌槽传质传热的进行. 最佳桨叶离底高度与槽径比为0.36，最佳桨叶间距与槽径比为0.44；在该最佳工况下临界离底悬浮转速Njs=118.3 r/min；得到既能达到完全离底悬浮、又能使搅拌功耗最小的最佳转速为n=124 r/min.

关键词: 改进型INTER-MIG桨, 固液悬浮, 临界离底悬浮转速, 功率消耗

Abstract: The solid-liquid suspension characteristics, critical suspension speed of impeller and power consumption of a stirred tank with dual improved INTER-MIG impeller were numerically simulated with the software Fluent 12.0 on a parallel computer workstation. The effects of rotation speed (n), impeller off-bottom clearance height (C1) and spacing between impellers (C2) on particles suspension characteristics in the stirred tank were analyzed under the particle volume fraction as at 30%. The results show that at a constant rotation speed and impeller diameter, local structure of flow field changes with C1 and C2, appropriate of C1 and C2 can make solid-liquid mixed more evenly and good for suspension of particles and the mass and heat transfer. The optimal value of C1/D is 0.36, D is the tank diameter, and the optimal value of C2/D 0.44. Under the optimum working conditions, the critical suspension speed of impeller, Njs is 118.3 r/min, and the optimum speed, n, 124 r/min, which ensures the solids just suspended off the bottom and the minimum consumption of power.

Key words: improved INTER-MIG impeller, solid-liquid suspension, critical suspension speed of impeller, power consumption

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