NMR imaging of velocity profiles and velocity distributions in bead packs

被引:131
作者
Kutsovsky, YE [1 ]
Scriven, LE [1 ]
Davis, HT [1 ]
Hammer, BE [1 ]
机构
[1] UNIV MINNESOTA, DEPT RADIOL, MINNEAPOLIS, MN 55455 USA
关键词
D O I
10.1063/1.868867
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
Spatially resolved velocity profiles and spatially nonresolved velocity distributions of steady flow in a tube and bead packs were measured. Two different NMR experiments were used to measure velocity distributions. In one, the velocity histogram was calculated from spatially resolved velocity phase encoded images acquired in a 6 mm bead pack. In the other, a Fourier how method was used to measure the velocity distribution directly in a 0.25 mm bead pack. Axial velocity profiles in the pore space of the 6 mm bead pack at Reynolds numbers of 14.9, 29.9, and 44.8 proved to be roughly parabolic, with maxima near the pore centers. Both NMR methods yielded the same dimensionless velocity distributions that contain negative as well as positive velocity components. The velocity distribution function derived from a bundle-of-tubes-model accounts for the positive part of the velocity distribution. (C) 1996 American Institute of Physics.
引用
收藏
页码:863 / 871
页数:9
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