Browsing by Subject "diffusion of hydrocarbon vapour"

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Access status: Open Access ,
Badania laboratoryjne dyfuzji par węglowodorów w ośrodku gruntowym
(2009) Fąfara, Zbigniew; Mirkiewicz, Piotr
Numerical modelling of migration of oil contaminations in the ground aeration area requires accounting for a number of accompanying processes, out of which diffusion of hydrocarbon vapours in the porous space of the ground may be sometimes very important. This, however, requires cognition of a number of parameters of a mathematical model describing properties of the porous medium, migrating fluids and conditions of migration. The coefficient of diffusion of hydrocarbon vapours in ground is crucial for the correct description of diffusion. However, specialist literature does not give detailed figures, except for averages of diffusion coefficients which cannot be referred to specific types of the ground. This is connected with the hardly accessible uncertainty coefficient to the final results of calculations. Therefore, the Authors designed a laboratory post for analysing hydrocarbon vapours and performed measurements for four natural, specially selected different models of homogeneous ground medium. The prepared physical models represent grounds containing gravel and sand fractions: course, medium and fine sands. Pb-free ethyline was used as a source of hydrocarbon vapour. The obtained results have been discussed in the paper. In the future they may be used for construing a mathematical model enabling one to more precisely assess the coefficient of diffusion of hydrocarbon vapours in ground air, depending on the ground properties, especially its grain compositions.