Development and testing of a kinetic model for oxygen transport in porous media in the presence of trapped gas
- Oregon State Univ., Corvallis, OR (United States). Dept. of Civil Engineering
- Chevron Research and Technology Co., Richmond, CA (United States)
The objective of this study was to develop and test a kinetic model for dissolved gas transport that combines the advection-dispersion equation with diffusion controlled mass transfer of a single dissolved gas component, and a stationary trapped gas phase with constant volume. The model contains three independent parameters: the Peclet number, P, retardation factor, R, and dimensionless mass transfer parameter, {omega}. The model accurately described the shape of breakthrough and elution curves for dissolved oxygen in column experiments performed with sand and varying amount and composition of trapped gas. Estimated values of P for the bromide tracer increased, corresponding to a decrease in dispersivity from 5.02 to 0.17 cm, as the trapped gas volume increased from 0 to 30% of the pore space. It is speculated that this effect is due to a narrower pore size distribution caused by trapped gas bubbles selectively occupying the largest pores. Estimated values of R increased as the trapped gas volume increased and confirmed earlier observations that even small amounts of trapped gas can significantly reduce rates of dissolved oxygen transport. Estimated values of {omega} ranged from 0.3 to 12.1.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 460457
- Journal Information:
- Ground Water, Journal Name: Ground Water Journal Issue: 2 Vol. 35; ISSN GRWAAP; ISSN 0017-467X
- Country of Publication:
- United States
- Language:
- English
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