Wetting front instability: 2. Experimental determination of relationships between system parameters and two‐dimensional unstable flow field behavior in initially dry porous media
Wetting front instability: 2. Experimental determination of relationships between system parameters and two‐dimensional unstable flow field behavior in initially dry porous media
复制标题
润湿锋不稳定性：2.初始干燥多孔介质中系统参数与二维不稳定流场行为之间关系的实验确定
DOI：
--
复制
发表时间：
1989
期刊：
影响因子：
--
通讯作者：
J. Parlange
中科院分区：
文献类型：
--
作者：
R. Glass;T. Steenhuis;J. Parlange
本文描述并解释了在论文1（R.J.Glass等，本期）。当湿润锋从最初干燥的细砂层进入下面的粗砂层时，湿润锋断裂成指状。一个专门开发的垂直板状室和相关技术的发展，这种指进的研究。通过上层使用不同的平均粒度分离物（底层使用相同的粗分离物）来系统地改变通过系统的流速。手指的宽度，传播速度，水分含量，并通过单独的手指的流速之间的关系进行实验确定和相关的底层的属性和通过系统的流速。结果与先前使用不同技术制备样品的实验研究中发现的结果不同。这里得到的结果与早先由J-Y导出的公式一致。Parlange和D.E. Hill（1976）通过线性稳定性分析。
This paper describes and interprets experimental studies of wetting front instability guided by the dimensional analysis presented in paper 1 (R.J. Glass et al., this issue). When a wetting front passes from a fine-textured layer of initially dry sand into an underlying coarse layer, the front breaks into fingers. A specially developed vertical slablike chamber and associated techniques were developed for the study of such fingering. The flow rate through the system is systematically varied by using different mean grain size separates for the upper layer (the same coarse separate being used for the bottom layer). Relationships between finger width, propagation velocity, moisture content, and flow rate through individual fingers are experimentally determined and related to the properties of the bottom layer and the flow rate through the system. The results are different than those found in a previous experimental study which used different techniques for sample preparation. Results obtained here agree with a formulation derived earlier by J-Y. Parlange and D.E. Hill (1976) through linear stability analysis.