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- W2480516740 abstract "A one-dimensional analytical model is developed for the vaporization of a single hydrocarbon contaminant, during subsurface remediation using steam injection, in the low permeability zones in the presence of a liquid water phase. The energy equation is solved to give temperature distributions in the two regions separated by the propagating evaporation front in terms of a defined similarity variable. Darcy`s law is then applied to predict the pressure distribution in the region between the evaporation front and the top surface in contact with the steam flowing in the high permeability zones of the subsurface. It is found that the length scale associated with the medium cleanup is proportional to the square root of the time scale and that the temperature at the evaporation front has the largest effect on the front propagation behavior. For relatively high permeability porous media, the temperature at the evaporation front is significantly lower than the normal boiling point of the hydrocarbon phase. This phenomenon is due to a convective flux of hydrocarbon and water vapor from the evaporation front caused by local total gas pressures exceeding the free stream steam pressure. The temperature at the evaporation front increases with decreasing medium permeability and increasing liquidmore » hydrocarbon saturations. Iterative procedures are outlined to obtain the temperature and pressure distributions, evaporation front propagation behavior, and mass removal rates. The analytical solution is shown to be in good agreement with numerical simulation conducted using a validated simulator.« less" @default.
- W2480516740 created "2016-08-23" @default.
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- W2480516740 date "1995-12-31" @default.
- W2480516740 modified "2023-09-23" @default.
- W2480516740 title "An analysis of the vaporization of volatile organic contaminants from porous media by conductive heating" @default.
- W2480516740 hasPublicationYear "1995" @default.
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