Velocity and concentration measurements in multiphase flows by NMR

Majors, Paul D.; Givler, Richard C.; Fukushima, Eiichi

doi:10.1016/0022-2364(89)90139-x

Cited by 19 publications

(7 citation statements)

References 8 publications

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“…Nuclear magnetic imaging (NMR or MRI): This high resolution, tomographic technique (Callaghan, 1991;Fukushima, 1999) is inherently sensitive to both concentration and velocity, enabling full 3D images of both variables to be measured, an example of which is given in Figure 6. Such tomographic imaging has been used to monitor particle migration in both laminar, Couette and Poiseuille suspension flows, as well as transitional and turbulent flows (Fukuda et al, 1985;Graham and Pullum, 2002;Jossic et al, 2002;Kose, 1991;Majors et al, 1989;Sinton and Chow, 1991). Despite its power, NMR suffers from extreme sensitivity to magnetic materials, e.g.…”

Section: Ultrasonic Doppler Velocity Profiling (Uvdp)mentioning

confidence: 99%

What’s going on in there?

Pullum¹

2011

Proceedings of the 14th International Seminar on Paste and Thickened Tailings

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Paste and thickened tailings both share similar properties, in that they appear to behave like homogeneous non-Newtonian fluids. Despite several publications on the issue, including various presentations at Paste conferences, the stratification of these materials, when subjected to a constant shear field, such as a laminar pipeline flow, still seems to be generally unknown. Design engineers design lines based on simple, small scale, rheological studies, using the assumption of homogeneous flow and the simplicity of a laminar flow regime. Such procedures generally under predict full scale operation, making large, or even full scale testing, appear to be essential. A review is given in this paper on research conducted by various groups, on such flows, in recent years, and describes methods that allow small scale testing to accurately predict full scale behaviour.

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Section: Ultrasonic Doppler Velocity Profiling (Uvdp)mentioning

confidence: 99%

What’s going on in there?

Pullum¹

2011

Proceedings of the 14th International Seminar on Paste and Thickened Tailings

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“…The Sinton and Chow (1991) Intensity and velocity data were collected over a range of 21 to 52 vol.% plastic spheres and Reynolds numbers ranging from 0.005 to 4.0. The carrier fluid was a mixture of polyether oil (Uncon oil, 75-H-90,000), water and sodium iodide to increase the fluid density to that of the solids having a density of 1190 kg/m a. NMR data were taken with a vertically oriented 4.7 T superconducting solenoid by techniques developed by Kose et al (1985) and Majors et al (1989). A positive-displacement…”

Section: Comparison With Experimental Datamentioning

confidence: 99%

Two-phase power-law modeling of pipe flows displaying shear-thinning phenomena

Ding¹,

Lyczkowski²,

Sha³

1993

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This paper describes our work in modeling concentrated liquid-solids flows in pipes. COMMIX-M, a three-dimensional transient and steady-state computer program developed at Argonne National Laboratory, was used to compute velocities and concentrations. Based on our previous analyses, some concentrated liquid-solids suspension flows display shear-thinning rather than Newtonian phenomena. Therefore, we developed a two-phase non-Newtonian power-law model that includes the effect of solids concentration on solids viscosity. With this new two-phase power-law solids-viscosity model, and with constitutive relationships for interfacial drag, virtual mass effect, shear lift force, and solids partial-slip boundary condition at the pipe walls, COMMIX-M is capable of analyzing concentrated three-dimensional liquid-solids flows.

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“…Majors et al [15] measured velocity and concentration distributions of liquid flow with suspensions which were composed of monodisperse polyethylene spheres (0.32 cm diameter) in a viscous (4 P) petroleum gear oil (SAE 80W) in a pipe. Abbott et al [16] measured suspension Couette flow using MRI.…”

Section: Introductionmentioning

confidence: 99%