Velocity and concentration studies of flowing suspensions by nuclear magnetic resonance imaging. Final report, October 7, 1994--October 6, 1996 [electronic resource]
Nuclear magnetic resonance imaging techniques were developed to study concentrated suspension flows. The tasks completed were: (1) materials selection for imaging of both particle and fluid components, (2) pipe flow measurements, and (3) flows in complex geometries. The partially completed task is t...
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Online Access |
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| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, DC : Oak Ridge, Tenn. :
United States. Office of the Assistant Secretary for Fossil Energy ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy,
1996.
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| Subjects: |
MARC
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| 245 | 0 | 0 | |a Velocity and concentration studies of flowing suspensions by nuclear magnetic resonance imaging. Final report, October 7, 1994--October 6, 1996 |h [electronic resource] |
| 260 | |a Washington, DC : |b United States. Office of the Assistant Secretary for Fossil Energy ; |a Oak Ridge, Tenn. : |b distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, |c 1996. | ||
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| 500 | |a 12/31/1996. | ||
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| 500 | |a "DE98054482" | ||
| 500 | |a Lovelace Institutes, Albuquerque, NM (United States) | ||
| 520 | 3 | |a Nuclear magnetic resonance imaging techniques were developed to study concentrated suspension flows. The tasks completed were: (1) materials selection for imaging of both particle and fluid components, (2) pipe flow measurements, and (3) flows in complex geometries. The partially completed task is the development of rapid imaging techniques by analog compensation of eddy currents, generated by the gradient pulses, and real-time image reconstruction from the data. The best combination of materials found is pharmaceutical beads in silicon oil. Their relaxation times T₁ are sufficiently different to permit imaging the two components separately. The pipe flow experiment used 3 mm, neutrally buoyant, plastic particles, up to 40% by volume, in 80--90W transmission oil flowing in a 5 cm diameter pipe. Distances ranging from 60 cm to 6 m downstream from a commercial mixer was studied. The flow is fully developed at 6 m and the concentration and velocity profiles agree with earlier lower resolution experiments. The eddy current compensation scheme works well for two channels and is being extended to eight channels. The authors have also built a rapid reconstruction hardware that processes and displays images in a fraction of a second. They studied the flow of neutrally buoyant concentrated suspension past a step expansion and contraction in a cylindrical pipe. Interesting transition is observed at the expansion whereby the high fluids-fraction outer layer spreads to become the outer layer in the larger pipe. | |
| 536 | |b FG22-94PC94248. | ||
| 650 | 7 | |a Progress Report. |2 local. | |
| 650 | 7 | |a Nuclear Magnetic Resonance. |2 local. | |
| 650 | 7 | |a Two-phase Flow. |2 local. | |
| 650 | 7 | |a Flow Rate. |2 local. | |
| 650 | 7 | |a Concentration Ratio. |2 local. | |
| 650 | 7 | |a Diagnostic Techniques. |2 local. | |
| 650 | 7 | |a Pipelines. |2 local. | |
| 650 | 7 | |a Engineering Not Included In Other Categories. |2 edbsc. | |
| 710 | 2 | |a United States. |b Office of the Assistant Secretary for Fossil Energy. |4 spn. | |
| 710 | 2 | |a National Energy Technology Laboratory (U.S.). |4 res. | |
| 710 | 2 | |a United States. |b Department of Energy. |b Office of Scientific and Technical Information. |4 dst. | |
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