摘要
从受力分析的角度，对气泡上浮末速度的理论公式进行了推导，得到了气泡上浮过程中的运动方程，并对半径位于40～350μm的微小气泡进行了仿真计算．在此基础上，利用带有显微摄像功能的粒子成像测速技术（PIV）装置对半径为20～320μm气泡的上浮速度进行了测量，通过对实验结果的统计，以及与仿真结果的比较分析可知，阻力系数变量与粘滞系数是影响气泡上浮速度的主要因素，它们的取值与上浮速度成反比，并得出了Re≤150条件下的微气泡运动通用的阻力系数表达式．
Based on the analysis of the forces acting on a single rising micro-bubble, the equilibrium e-／quation of the rising micro-bubble is derived, and the rising velocities of the bubbles with the radius of 40-350μm are simulated. By using particle image velocimetry （PIV）, the rising velocities were measured experimentally for the micro-bubbles ranging from 20-320μm radius. After the authors analyzing and comparing the experiment results and the simulation results, it is indicated that the drag value and viscosity coefficient are the important factors influencing bubbles rising, and they are reverse to the terminal velocities. In addition, a general expression of drag coefficient when Re≤150 is given.
出处
《测试技术学报》
2008年第4期346-349,共4页
Journal of Test and Measurement Technology
基金
国防重点基金资助项目(614012)
‘十一五’预研基金资助项目(51302050301)
关键词
微气泡
浮升运动
粒子成像测速技术
雷诺数
阻力系数
micro-bubble
bubble rising
particle image velocimetry
reynold＇s number
drag coefficient
