改进Washburn方程用于测定多孔介质渗透率的实验研究  

Study of determining the permeability of porous media based on improved Washburn equation

作　　者：杜红普[1] 王华军[2] 谢尚群[3] 李敏[1] 

机构地区：[1]河北工业大学土木工程学院,天津300401 [2]河北工业大学能源与环境工程学院,天津300401 [3]中国建筑科学研究院,北京100013

出　　处：《河北工业大学学报》2012年第5期44-48,共5页Journal of Hebei University of Technology

基　　金：天津市应用基础及前沿技术研究计划(10JCYBJC08500)

摘　　要：Washburn方程在分析毛细管流现象中有很好的代表性,其改进方程在预测多孔介质毛细上升高度前期阶段具有较高的吻合度.本文以不同粒径范围的洗砂作为研究对象,用该模型对不同实验条件下的数据进行优化拟合,得出该条件下的毛细平衡高度和渗流速度,从而得到一种测定多孔介质渗透率的新方法.文中进一步实验分析了影响该法测定多孔介质渗透率的因素,并与经典模型进行验证比较.结果表明用该方法测定多孔介质渗透率简便易行,且具有很好的适用性和准确度.The Washburn equation has the better representation on the analysis of capillary flow.The improved form owns the high coincidence in predicting the height of capillary rise at the early period.As for the washed-sand with different diameter,the dates obtained under various experimental conditions,the equilibrium height together with the fluid velocity was determined by the steepest descent method to calculate the hydraulic permeability.From the test of capillary rise in porous media,the effects of the filling height and immersion depth of the capillary tube on the test accuracy were discussed,and the results were verified compared with the classical models.It showed that the method had the higher accuracy and great significance to test the permeability conveniently.

关 键 词：Washburn方程 渗透率 毛细上升高度 装填高度 浸入深度 

分 类 号：O357.3[理学—流体力学]