کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
977804 933210 2008 16 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Elliptic random-walk equation for suspension and tracer transport in porous media
موضوعات مرتبط
مهندسی و علوم پایه ریاضیات فیزیک ریاضی
پیش نمایش صفحه اول مقاله
Elliptic random-walk equation for suspension and tracer transport in porous media
چکیده انگلیسی

We propose a new approach to transport of the suspensions and tracers in porous media. The approach is based on a modified version of the continuous time random walk (CTRW) theory. In the framework of this theory we derive an elliptic transport equation. The new equation contains the time and the mixed dispersion terms expressing the dispersion of the particle time steps. The properties of the new equation are studied and the fundamental analytical solutions are obtained. The solution of the pulse injection problem describing a common tracer injection experiment is studied in greater detail. The new theory predicts delay of the maximum of the tracer, compared to the velocity of the flow, while its forward “tail” contains much more particles than in the solution of the classical parabolic (advection-dispersion) equation. This is in agreement with the experimental observations and predictions of the CTRW theory.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica A: Statistical Mechanics and its Applications - Volume 387, Issue 24, 15 October 2008, Pages 5963–5978
نویسندگان
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