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›› 2010, Vol. 10 ›› Issue (1): 1-9.

• 流动与传递 •    下一篇

用FPIV方法研究固-液方形搅拌槽内液相湍流

江涵 刘心洪 黄雄斌   

  1. 北京化工大学化学工程学院 北京化工大学化学工程学院 北京化工大学化学工程学院
  • 收稿日期:2009-10-21 修回日期:2009-12-24 出版日期:2010-02-20 发布日期:2010-02-20
  • 通讯作者: 黄雄斌

Investigation on Turbulent Flow Characteristics in a Solid-Liquid Square Stirred Tank Using 2D-PIV Method

JIANG Han LIU Xin-hong HUANG Xiong-bin;   

  1. College of Chemical Engineering, Beijing University of Chemical Technology College of Chemical Engineering, Beijing University of Chemical Technology College of Chemical Engineering, Beijing University of Chemical Technology
  • Received:2009-10-21 Revised:2009-12-24 Online:2010-02-20 Published:2010-02-20
  • Contact: HUANG Xiong-bin;

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摘要： 采用粒子图像测速和分析技术，研究了固-液方槽体系中液相湍流特性. 测得固体颗粒浓度从0增加到0.9%(j)时，液相在桨叶区和近壁区的湍流流场分布. 结果表明，随固体颗粒浓度增加到0.9%(j)，液相轴向平均速度<ν>持续减小，在桨叶区其衰减幅度Dv*与固体颗粒浓度Cv的关系为Dv*μCv0.776，近壁区为Dv*μCv1.474. 桨叶区湍流动能分布较复杂，与单相相比，固体颗粒浓度从0增加到0.5%(j)时，湍流动能增强；固体颗粒浓度从0.5%增加到0.9%(j)时，湍流动能减小. 在整个测量区域，随固体颗粒浓度增加，平均湍流动能呈减小趋势，拟合平均湍流动能 与固体颗粒浓度的关系为 μCv-0.073，平均湍流动能耗散率呈增长趋势，拟合平均湍流动能耗散速率 与固体颗粒浓度的关系为 μCv1.113.

关键词: PIV方法, 固-液搅拌槽, 湍流动能, 湍流动能耗散率

Abstract: Two-dimensional particle image velocimetry and digital image analysis were used to quantify the hydrodynamics of solid-liquid suspension in a square stirred tank. Solid particle spheres with 750 mm diameter were employed as the dispersed phase with up to volumetric concentration of 0.9%(j) in water. The magnitude of continuous phase mean axial velocity decreased in the impeller and near-wall regions, as the solid concentration increased, the relationship of the velocity drop and the particle concentration could be respectively described as Dv*μCv0.776 and Dv*μCv1.474. The turbulent kinetic energy distribution of the continuous phase was complex, because it increased in the impeller region with the solid volumetric concentration up to 0.5%(j) and decreased above that. The average turbulent kinetic energy remained decreased as the particle concentration increasing from 0.2% to 0.9%(j), the relationship could be described as ( μCv-0.073). By contrast, the average turbulent kinetic energy dissipation rate of the continuous phase was more enhanced than that in the single phase flow, which could be described as μCv1.113.

Key words: PIV method, solid-liquid stirred tank, turbulent kinetic energy, turbulence kinetic energy dissipation rate

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