The effect of micro-heterogeneity and capillary number on capillary pressure and relative permeability curves of soils

Steady-state two-phase relative permeability functions of porous media: A revisit

“…1, Aggelopoulos and Tsakiroglou, 2008). All measuring devices were connected to a data acquisition card equipped in the host computer.…”

“…The multi-point conductivity meter allowed the simultaneous measurement of the electrical resistance across various segments of the column with respect to a reference electrode. More details concerning the determination of the electrical resistance over the successive segments of the column from measurements of the corresponding voltages are reported elsewhere (Aggelopoulos and Tsakiroglou, 2008). The pressure drop across each phase was measured with the aid of pressure transducers connected to the inlet tubes ( Fig.…”

“…Two-phase flow of immiscible fluids in porous media has attracted the attention of many research groups during the last 30 years (Payatakes, 1982;Lenormand et al, 1983;Dias and Payatakes, 1986a,b;Lenormand et al, 1988;Blunt and King, 1991;Vizika et al, 1994;Avraam and Payatakes, 1995a,b;Aker et al, 1998;Xu et al, 1998;Knudsen and Hansen, 2002;Tsakiroglou et al, 2003;Valvatne and Blunt, 2004;Li et al, 2005;Theodoropoulou et al, 2005;Joekar-Niasar et al, 2008;Aggelopoulos and Tsakiroglou, 2008;Tallakstad et al, 2009a;Raoof and Hassanizadeh, 2012). There is a broad variety of relevant application areas such as the enhanced oil recovery (Lackner and Torsaeter, 2006), the CO 2 storage in deep saline aquifers and depleted oil reservoirs (Berg and Ott, 2012), the soil contamination and reconstitution (Gao et al, 2013), the performance of proton exchange membranes in fuel cells (Wang et al, 2010).…”

Geoelectrical characterization of carbonate and silicate porous media in the presence of supercritical CO2–water flow

“…In this regard, one needs the understanding of the constitutive relationships that govern immiscible flow in porous media, namely, the capillary pressure-saturation and relative permeability relationships (P c -S-K r ) (see e.g. Doughty 2007;Aggelopoulos & Tsakiroglou 2008; and/or geoelectrical characteristics of the system (see e.g. Nakatsuka et al 2010;Abidoye et al 2015).…”

Dielectric barrier discharge plasma used as a means for the remediation of soils contaminated by non-aqueous phase liquids

“…local permeability, effective gas diffusivity, moisture), the NAPL composition and concentration and the biological activity of micro florae. For instance, due to the existence of strong heterogeneities in the pore space of mineral soils (sand/clay/silt), the pore length scales span five-to-six orders of magnitude [8], the local permeability fluctuates over a broad range [9,10], the fluid transport within soils is controlled by preferential flow pathways, and the efficiency of the conventional remediation techniques based on the flushing of fluids through the porous media becomes very low [11,12]. In addition, due to certain drawbacks of the conventional remediation technologies, such as energy/time requirements, and secondary pollution, it becomes widely accepted that the development of cost-effective, rapid and highly efficient methods for soil remediation is crucial.…”