单个颗粒在垂直同心环空牛顿流体及幂律流体中运动规律的研究

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。

A EXPERIMENTAL RESEARCH FOR THE MOVEMENT OF A SINGLE PARTICLE IN VERTICAL AND CONCENTRIC ANNULI THROUGH NEWTONIAN AND POWER LAW FLUIDS

This paper is in point of the condition that the theoriesobtained in oil-drilling annular hydraulics research are different from one in the field drilling in selecting the parameters of test. The parameters more approached to the field drilling have been selected in the experiment on the movement of a single particle in Newtonian and power law fluids on the vertical concentric full scale annular test installation. Experiments were carried out using mathematical statistics and model test method. The data have been collected and handled, and curve fitting of data by computer was done with polynomial. The influence law of each factor, such as rotary speed of inside pipe, diameter of particle and annular average velocity have been obtained. Then applying dimension analysis method, the correlation among the factors were found and the experimental formulas of aparticle moving up in axial or helical flow .and settling down in static or rotary annular fluid field in Newtonian or power law fluid were obtained. Based on the theory in mechanics of fluids, the experimental results were analyzed.