Two-phase flow characterization by nuclear magnetic resonance

Nuclear magnetic resonance: A new tool for the validation of multiphase multidimensional CFD codes

“…As shown earlier by Leblond et al (1994Leblond et al ( , 1998 with the same spectrometer described in detail by Javelot (1994), area-averaged velocity and void fraction can be determined from the NMR signal with the PFGSE sequence. The absolute magnitude of the signal is proportional to the liquid content of the magnetized volume.…”

Applications of tomography in bubble column and trickle bed reactors

“…Further, the technique has been adapted for use on a low-field permanent magnet system for characterizing the grain size distribution in rock samples at a resolution an order of magnitude or more better than could be achieved with conventional MRI techniques (Holland, Mitchell, Blake, & Gladden, 2013). In the future such an approach could be used with other low-field instrumentation, for example (Leblond, Javelot, Lebrun, & Lebon, 1998), to permit the measurement of bubble size distributions under conditions of relevance to industrial bubble columns.…”

SPRITE MRI of bubbly flow in a horizontal pipe

“…Abouelwafa and Kendall [11] used CW NMR spectroscopy to measure the volume fraction and individual flow rates of two-component water-oil and water-air mixtures. Leblond et al [12] used Pulsed Field Gradient Spin Echo (PFGSE) NMR to measure volume-averaged void fraction, liquid velocity propagators and turbulence fluctuations in steady-state bubble flow as well as the time evolution of flow under a transient condition. Barberon and Leblond [13] used time-averaged spatially-resolved PFGSE MRI to demonstrate the existence of a recirculatory flow under a Taylor slug bubble, while Gladden et al [14] employed the GERVAIS ultrafast velocity imaging sequence to obtain instantaneous velocity maps of liquid flow in the same system.…”