| Autor: |
Scheven UM; Schlumberger-Doll Research, 36 Old Quarry Road, Ridgefield, Connecticut 06877, USA. scheven@slb.com, Seland JG, Cory DG |
| Jazyk: |
angličtina |
| Zdroj: |
Physical review. E, Statistical, nonlinear, and soft matter physics [Phys Rev E Stat Nonlin Soft Matter Phys] 2004 Feb; Vol. 69 (2 Pt 1), pp. 021201. Date of Electronic Publication: 2004 Feb 20. |
| DOI: |
10.1103/PhysRevE.69.021201 |
| Abstrakt: |
We flow water through a pack of porous glass beads and employ NMR to measure molecular displacement distributions--the propagators--in the Stokes flow regime. Fluid is flowed over several evolution times to attain fixed mean displacements, and the time dependence of the resulting propagators is analyzed for the effects of diffusion, NMR relaxation, and signal loss due to internal fields. We delineate and illustrate the experimental regimes in which these different effects make their presence felt. Simulations on a simple model system reproduce the essential features of our experimental results and provide insight into the mechanisms shaping the propagators. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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