caa a22 4500 463163052 CHVBK 20180406164753.0 cr unu---uuuuu 170326e20070201xx s 000 0 eng 10.1007/s11242-006-0030-z doi (NATIONALLICENCE)springer-10.1007/s11242-006-0030-z Water removal from porous media by gas injection: experiments and simulation [Elektronische Daten] [Jagannathan Mahadevan, Mukul Sharma, Yannis Yortsos] The flow of a saturated gas through a porous medium, partially occupied by a liquid phase, causes evaporation due to gas expansion. This process, referred to as flow-through drying, is important in a wide variety of natural and industrial applications, such as natural gas production, convective drying of paper, catalysts, fuel cells and membranes. X-ray imaging experiments were performed to study the flow-through drying of water-saturated porous media during gas injection. The results show that the liquid saturation profile and the rate of drying are dependent on the viscous pressure drop, the state of saturation of the gas and the capillary characteristics of the porous medium. During the injection of a completely saturated gas, drying occurs only due to gas expansion. Capillary-driven flow from regions of high saturation to regions of low saturation lead to more uniform saturation profiles. During the injection of a dry gas, a drying front develops at the inlet and propagates through the porous medium. The experimental results are compared with numerical results from a continuum model. A good agreement is found for the case of sandstone. The comparison is less satisfactory for the experiments with limestone. Springer Science+Business Media B.V., 2007 Drying nationallicence Gas injection nationallicence Capillary film flow nationallicence Flow-through drying nationallicence Porous media nationallicence Fuel cells nationallicence a gm : dimensionless geometric factor nationallicence C : dimensionless pressure drop nationallicence C a : attenuation coefficient nationallicence g : gravitational constant, 9.8 m/s2 nationallicence I : attenuated X-ray intensity nationallicence I 0 : inital X-ray intensity nationallicence k : gas permeability at mean pressure, D (9.87 × 10−13 m 2) nationallicence k rg : relative permeability to gas nationallicence k rgo : end-point relative permeability to gas nationallicence k rx : relative permeability of phase ‘x' nationallicence k rgx : end-point relative permeability of phase ‘x' nationallicence L : length of core nationallicence m nationallicence N wi : dimensionless wicking number nationallicence P : pressure, atm nationallicence P s : saturation pressure, atm nationallicence P c : capillary pressure, atm nationallicence r c : hydraulic radius of a rectangular capillary, m nationallicence R g : universal gas constant, 8.314 J/mol/K nationallicence S : saturation nationallicence S xr : residual saturation of phase ‘x' nationallicence S̅ : normalized saturation nationallicence T : temperature,°C nationallicence u : velocity, m/s nationallicence V P : pore volume of rock, AϕL nationallicence 3 nationallicence y : dimensionless length nationallicence y w : mole fraction of water in gas nationallicence y ws : mole fraction of water at 100% relative humidity nationallicence z : gas compressibility factor nationallicence Subscripts nationallicence 0 : inlet position of sample nationallicence L : outlet position of sample nationallicence g : gas phase nationallicence w : water phase nationallicence T : total value nationallicence M : mean value nationallicence D : dimensionless quantity nationallicence j : a single x-ray ‘j' nationallicence Greek letters nationallicence ϕ : porosity of core nationallicence μ : viscosity, kg/m/s2 nationallicence γ : interfacial tension of air-water interface nationallicence kg/s2 nationallicence α′ : capillary pressure curve constant, atm nationallicence α : concentration of water in gas phase, mol/m3 nationallicence β : concentration of water in liquid phase, mol/ m3 nationallicence ɛ : drying time scaling factor nationallicence λ : gas mobility at mean pressure nationallicence λr : relative gas mobility nationallicence ρ : density, kg/m3 nationallicence π : scaled pressure, atm nationallicence Π : modified pressure, Pg − P s atm nationallicence τ : scaled time ( = ɛt), s nationallicence γ : interfacial tension, N/m nationallicence Mahadevan Jagannathan Department of Petroleum Engineering, University of Tulsa, Tulsa, OK, USA aut Sharma Mukul Department of Chemical and Petroleum Engineering, The University of Texas at Austin, Austin, TX, USA aut Yortsos Yannis Department of Chemical Engineering, University of Southern California, Los Angeles, CA, USA aut Transport in Porous Media Kluwer Academic Publishers 66/3(2007-02-01), 287-309 0169-3913 66:3<287 2007 66 11242 https://doi.org/10.1007/s11242-006-0030-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11242-006-0030-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mahadevan Jagannathan Department of Petroleum Engineering, University of Tulsa, Tulsa, OK, USA aut NATIONALLICENCE 700 1- Sharma Mukul Department of Chemical and Petroleum Engineering, The University of Texas at Austin, Austin, TX, USA aut NATIONALLICENCE 700 1- Yortsos Yannis Department of Chemical Engineering, University of Southern California, Los Angeles, CA, USA aut NATIONALLICENCE 773 0- Transport in Porous Media Kluwer Academic Publishers 66/3(2007-02-01), 287-309 0169-3913 66:3<287 2007 66 11242 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer