HR: 11:05h
AN: H32A-04    [Abstracts]
TI: Magnetic Resonance Imaging and Theoretical Analysis of Particle Deposition in Porous Media
AU: Amitay-Rosen, T
EM: tal.amitay@weizmann.ac.il
AF: Weizmann Institute of Science, Dept. Environmental Sciences and Energy Research, Rehovot, 76100 Israel
AU: * Cortis, A
EM: andrea.cortis@weizmann.ac.il
AF: Weizmann Institute of Science, Dept. Environmental Sciences and Energy Research, Rehovot, 76100 Israel
AU: Berkowitz, B
EM: brian.berkowitz@weizmann.ac.il
AF: Weizmann Institute of Science, Dept. Environmental Sciences and Energy Research, Rehovot, 76100 Israel
AB: Measurements of particle deposition and mobilization in porous columns were performed using nuclear magnetic resonance imaging (MRI). Use of MRI enabled acquisition of detailed measurements that quantify spatial and temporal evolution of particle transport patterns and porosity changes due to particle deposition and mobilization. In contrast to previous studies, measurements indicate that at least for the considered particle sizes, particle deposition tends to increase with distance into the column. A theoretical model of particle deposition and porosity reduction was developed to accompany the measurements. Because of difficulties associated with identifying unique parameterizations for processes of particle straining, attachment and exclusion, a simple phenomenological, physically-motivated model is suggested. The model requires a minimum number of fitting parameters, and matches the essential features of the experimental measurements on spatial and temporal flow and deposition patterns. Moreover, resulting fluctuations in the model deposition coefficient induce a memory effect in the deposition which can be treated by means of a convolution in time.
DE: 5112 Microstructure
DE: 5114 Permeability and porosity
DE: 5139 Transport properties
DE: 5194 Instruments and techniques
DE: 3210 Modeling
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting