方形与圆形管道内多孔介质渗流的实验研究

Comparison experiment on porous medium seepage flow in rectangle and circular pipes

为了研究压差与填充物料堆积形态对多孔介质渗流流动的影响,进行方形与圆形管道陶粒填充渗流实验。利用自主搭建的实验装置,分别测定两组方形管道和两组圆形管道渗流压差与渗流速度。应用线性与非线性渗流理论,分析该四组实验数据,得到线性与非线性渗透率和非达西因子。结果表明:随着压差的增大,流动从线性逐渐过渡到非线性;随着填充密实程度的增加,非线性渗流渗透率变小,非达西因子变大。

This paper is concerned with an experiment on the seepage flow fields in the rectangle and circular pipes with the ceramsite filling to study the effects of the differential pressure and the filling material accumulation morphology on the porous media seepage flow. This study does so by using independently designed experimental apparatus to perform the measurements of the differential pressures and velocities of the seepage flow in two sizes of the rectangle pipe and in two sizes of the circular pipe respectively,analyzing the data of four size pipes applying the linear and nonlinear seepage flow theory,and thereby deducing the linear,nonlinear permeability and non-Darcy factors from the data. The results show that the regime of seepage flow experiences a gradual transition from the linear to nonlinear due to the increase of differential pressure; and an increase in the filling compacting degree in a pipe results in a decrease in permeability of nonlinear seepage flow,but an increase in the non-Darcy factor.