Capillary Pressure Curve for Liquid Menisci in a Cubic Assembly of Spherical Particles Below Irreducible Saturation

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• 作者：1. Department of Civil Engineering ; Technion ; 32000 Haifa ; Israel2. Stowers Institute for Medical Research ; Kansas City ; MO 64110 ; USA
• 关键词：Porous media – ; Two ; phase flow – ; Wetting fluid – ; Capillary pressure curve
• 刊名：Transport in Porous Media
• 出版年：2011
• 出版时间：August 2011
• 年：2011
• 卷：89
• 期：1
• 页码：63-73
• 全文大小：400.7 KB
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• 作者单位：http://www.springerlink.com/content/010582x252l7r1ur/
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geotechnical Engineering
  Industrial Chemistry and Chemical Engineering
  Civil Engineering
  Hydrogeology
  Mechanics, Fluids and Thermodynamics
  
• 出版者：Springer Netherlands
• ISSN：1573-1634

文摘

The capillary pressure–saturation relationship, P _c(S _w), is an essential element in modeling two-phase flow in porous media (PM). In most practical cases of interest, this relationship, for a given PM, is obtained experimentally, due to the irregular shape of the void space. We present the P _c(S _w) curve obtained by basic considerations, albeit for a particular class of regular PM. We analyze the characteristics of the various segments of the capillary pressure curve. The main features are the behavior of the P _c(S _w) curve as the wetting-fluid saturation approaches zero, and as this saturation is increased beyond a certain critical value. We show that under certain conditions (contact angle, distance between spheres, and saturation), the value of the capillary pressure may change sign.