Prediction of capillary air-liquid interfacial area vs. saturation function from relationship between capillary pressure and water saturation. (November 2016)

• Record Type: Journal Article
• Authors: Diamantopoulos, E.; Durner, W.; Harter, T.
• Is Part Of: Advances in water resources. Volume 97(2016)
• Page Start: 219
• Page End: 223
• Publication Date: 2016-11
• Subjects: Air-water interfacial area -- Saturation -- Contact angle -- Porous media -- Unsaturated flow; Hydrology -- Periodicals; Hydrodynamics -- Periodicals; Hydraulic engineering -- Periodicals; 551.48
• DOI: 10.1016/j.advwatres.2016.09.012
• Languages: English
• ISSNs: 0309-1708

Abstract

Highlights: Predicting Alv ( S ) from S (h). Comparison with thermodynamic models. Idealized pore space models and thermodynamic models may contain predictive power for the Alv ( S ) relationship. Abstract: This short communication investigates if the capillary air-liquid interfacial area vs. saturation relationship Alv ( S ) can be predicted from the capillary pressure vs. saturation relationship S ( h ), using the theoretical sample scale model of Diamantopoulos and Durner (2013, 2015). We selected three published experimental datasets, where S ( h ) and Alv ( S ) relationships had been measured for the same porous media. The sample scale model was fitted to the retention curve S ( h ) of each porous medium and then used to predict the air-liquid interfacial area Alv ( S ). We also included in the analysis the thermodynamic models of Leverett (1941) and Grant and Gerhard (2007). For two sandy materials and especially for high saturation values, the model predicted the capillary Alv ( S ) successfully, which was in one case given by a pore-network model simulation (Kibbey and Chen, 2012) and in the other case experimentally determined (Brusseau et al., 2006). For glass bead experiments, the contact angle needed to be fitted to properly describe the experimental Alv ( S ) curve.