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本文选择更接近于实际的实验参数,使用全尺寸的环空实验架,在牛顿流体及幂律流体中做了颗粒上返及下沉规律的实验。运用数理分析和模型实验方法设计了实验方案,用统计分析方法采集并处理数据。通过计算机用多项式对实验结果做曲线拟合,得出了颗粒粒径、内管转速、环空平均流速等单因素的影响规律。运用量纲分析方法寻找各单因素影响规律之间的关系,从而得出了单个颗粒在牛顿流体、幂律流体中,轴向流和螺旋流流场下上返以及在静止和旋转流场中下沉规律的半经验公式。最后运用流体力学理论对结果进行了分析,认为在分析颗粒在环空中运动规律时,应区别颗粒在环空中上返和下沉两种情况,而不应在上返规律中直接套用下沉规律的结果。
In this paper, we choose to be closer to the actual experimental parameters, using full-scale experimental loop Hollow, Newtonian fluid and power law fluid particle back to the law and sinking experiments. The experimental scheme was designed by mathematical analysis and model experiment method, and the data were collected and processed by statistical analysis. The polynomial curve was fitted to the experimental results by computer, and the effect of single factor such as particle diameter, inner tube rotating speed and annular average velocity was obtained. Using the dimensional analysis method to find the relationship between the single-factor influence laws, we can get the conclusion that the single particles in the Newtonian fluid, the power law fluid, the axial flow and the spiral flow return and in the stationary and the rotating flow field Sinking law of the semi-empirical formula. Finally, the fluid mechanics theory is used to analyze the results. It is suggested that in analyzing the motion of particles in the annulus, the particles should be distinguished from each other in the annulus and should not be directly applied to the subsidence law the result of.