Numerical simulation of temperature-driven air circulation and oxygen transport in unsaturated porous media

Conference · Wed Jan 01 00:00:00 EST 1992 · Geological Society of America, Abstracts with Programs; (United States)

OSTI ID:5806868

Guo, Weixing; Parizek, R R ^[1]

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1. Pennsylvania State Univ., University Park, PA (United States). Dept. of Geosciences

Temperature-driven air circulation within unsaturated porous media is receiving increasing attention in the studies of volatile organic component transport and remediation, safety assessment of radioactive waste repositories, soil moisture redistribution, etc. This coupled physical process also plays an important role in supplying oxygen to coal mine spoil where acid mine drainage is generated. To investigate the availability of oxygen within mine spoil, as the primary oxidant in acid reactions, a transient two-dimensional numerical model (HOT) which incorporates temperature-driven air circulation, dispersion-advection oxygen transport in gas phase, steady-state groundwater flow and chemical reactions, has been created. Energy and mass transfer across liquid and gas phases are included. Shrinking core models are used to simulate the kinetics of acid reactions. The rates of heat generation and oxygen consumption are determined stoichiometrically. The generalized Newton-Raphson method is used to linearize the partial differential equations describing heat and mass transfer in porous media. HOT has been used in studies of acid mine drainage generation within coal mine spoil and successfully compared with in-situ temperature measurements. This model may also be applied for some other research including soil vapor extraction, radon migration in soils and temperature prediction of nuclear waste repositories within unsaturated rocks.

• OSTI ID: 5806868
• Report Number(s): CONF-921058-; CODEN: GAAPBC
• Journal Information: Geological Society of America, Abstracts with Programs; (United States), Vol. 24:7; Conference: 1992 annual meeting of the Geological Society of America (GSA), Cincinnati, OH (United States), 26-29 Oct 1992; ISSN 0016-7592
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
01 COAL, LIGNITE, AND PEAT
54 ENVIRONMENTAL SCIENCES
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
POROUS MATERIALS
NATURAL CONVECTION
ACID MINE DRAINAGE
DEGASSING
DISTRIBUTION
ENERGY TRANSFER
FLOW MODELS
GROUND WATER
H CODES
MASS TRANSFER
MOISTURE
OXYGEN
RADIOACTIVE WASTE DISPOSAL
RADON
RISK ASSESSMENT
SOILS
SPOIL BANKS
SYNTHESIS
TWO-DIMENSIONAL CALCULATIONS
VOLATILE MATTER
COMPUTER CODES
CONVECTION
ELEMENTS
FLUIDS
GASES
HEAT TRANSFER
HYDROGEN COMPOUNDS
MANAGEMENT
MATERIALS
MATHEMATICAL MODELS
MATTER
NONMETALS
OXYGEN COMPOUNDS
RADIOACTIVE WASTE MANAGEMENT
RARE GASES
WASTE DISPOSAL
WASTE MANAGEMENT
WATER
580000* - Geosciences
011000 - Coal
Lignite
& Peat- Reserves
Geology
& Exploration
540250 - Environment
Terrestrial- Site Resource & Use Studies- (1990-)
052002 - Nuclear Fuels- Waste Disposal & Storage