Numerical simulation of gas venting for NAPL site remediation

Forsyth, Peter; Shao, Baoli

doi:10.1016/0309-1708(91)90022-g

Cited by 54 publications

(30 citation statements)

References 25 publications

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“…When gas is transported continuously, channel flow may occur. Experiments and numerical simulations have been carried out to investigate the radius of influence area and contaminant removal rate under the condition of channel flow [Geistlinger et al, 2009;Forsyth, 1993;Forsyth and Shao, 1991;McCray, 2000;Thomson and Johnson, 2000]. However, gas channels might not be necessarily stable.…”

Section: Air Spargingmentioning

confidence: 99%

Microbubble transport in water‐saturated porous media

Kong

Scheuermann

et al. 2015

Water Resources Research

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Laboratory experiments were conducted to investigate flow of discrete microbubbles through a water-saturated porous medium. During the experiments, bubbles, released from a diffuser, moved upward through a quasi-2-D flume filled with transparent water-based gelbeads and formed a distinct plume that could be well registered by a calibrated camera. Outflowing bubbles were collected on the top of the flume using volumetric burettes for flux measurements. We quantified the scaling behaviors between the gas (bubble) release rates and various characteristic parameters of the bubble plume, including plume tip velocity, plume width, and breakthrough time of the plume front. The experiments also revealed circulations of ambient pore water induced by the bubble flow. Based on a simple momentum exchange model, we showed that the relationship between the mean pore water velocity and gas release rate is consistent with the scaling solution for the bubble plume. These findings have important implications for studies of natural gas emission and air sparging, as well as fundamental research on bubble transport in porous media.

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Section: Air Spargingmentioning

confidence: 99%

Microbubble transport in water‐saturated porous media

Kong

Scheuermann

et al. 2015

Water Resources Research

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“…P,,, and Pcgw are experimentally determined capillary pressure curves, as are the relative permeabilities k,1.28 S,* is a blending parameter used to ensure that the capillary pressure has the correct form as the non-aqueous phase saturation goes to zero." Although the pressure relations in equation (4) are more properly termed constitutive relations, we will refer to these types of relations collectively as algebraic constraints, to distinguish them from the differential mass conservation equations.…”

Section: Formulationmentioning

confidence: 99%

Three‐dimensional modelling of steam flush for DNAPL site remediation

Forsyth

1994

Numerical Methods in Fluids

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“…The substitution of Darcy's law (2) into the component conservation equations (1) and a finite volume (box) discretization (see Fig. 1) with backward Euler time discretization, mass lumping and rearrangement of the accumulation terms yields the following discrete formulation (Helmig [1]' Forsyth & Shao [4], Forsyth [6], Pandayet al [7]):…”

Section: Numerical Formulationsmentioning

confidence: 99%

Numerical Modelling of Multiphase—Multicomponent Systems in Porous Media

Huber

Helmig

1999

Scientific Computing in Chemical Engineering II

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Abstract. Flow and transport processes in the subsurface are of major interest for the study of NAPL (non-aqueous phase liquids) contaminations and for the development of efficient remediation techniques and strategies.For the simulation of NAPL infiltrations the gaseous diffusion in the soil air is an important transport mechanism in the unsaturated zone. Due to the thermodynamic equilibrium organic chemicals migrate from the soil air into the groundwater travelling considerable distances from the infiltration source. Numerical simulations can be used as a prognosis tool to predict the movement of contaminant plumes in the subsurface.New clean-up methods such as alcohol flooding, SEAR (surfactant-enhanced aquifer remediation), SVE (soil vapor extraction), and steam injection are developed and investigated using numerical simulators. E.g., miscible displacement and enhanced dissolution are the key processes for alcohol flooding to remove residual organic contaminants from the subsurface. This involves the phase partitioning of the different compounds over the ambient phases.The modelling of multiphase-multicomponent systems in porous media is presented. Furthermore, a contamination and a remediation scenario are studied by the use of a numerical simulator.

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Numerical simulation of gas venting for NAPL site remediation

Cited by 54 publications

References 25 publications

Microbubble transport in water‐saturated porous media

Microbubble transport in water‐saturated porous media

Three‐dimensional modelling of steam flush for DNAPL site remediation

Numerical Modelling of Multiphase—Multicomponent Systems in Porous Media

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