کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1807326 1025255 2009 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Imaging water fluxes in porous media by magnetic resonance imaging using D2O as a tracer
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Imaging water fluxes in porous media by magnetic resonance imaging using D2O as a tracer
چکیده انگلیسی

In this study, we investigate the usefulness of D2O as a conservative tracer for monitoring water flux by MRI in a heterogeneous sand column. The column consisted of a cylindrical 3×9-cm packing of fine sand in which an 8-mm diameter cylindrical obstacle was placed. Constant steady-state flux densities between Jw=0.07 and 0.28 cm min−1 corresponding to mean pore flow velocities between 0.20 and 0.79 cm min−1 were imposed at the top of the sand column, and a constant hydraulic head of −39 cm was maintained at the lower boundary. We injected pulses of 0.01 M NiCl2 and 55% D2O and monitored the motion of the tracer plumes by MRI using a fast spin echo sequence over a period of 20 min. We observed that the center of gravity of all plumes moved with the mean pore flow velocity, which showed that D2O behaves as a conservative tracer. The motion of the tracer plume at Jw=0.14 cm min−1 was validated by a numerical simulation using HYDRUS2D, which reproduced the experimentally observed behavior very satisfactorily.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Magnetic Resonance Imaging - Volume 27, Issue 2, February 2009, Pages 285–292
نویسندگان
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