Impedance imaging relative to gas-liquid systems

Jones, O.C.; Lin, Jen-Tai; Ovacik, Levent; Shu, Hongjun

doi:10.1016/0029-5493(93)90100-n

Cited by 38 publications

(28 citation statements)

References 43 publications

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“…Multiple measurements ofj and Vat the boundary are used to iteratively reconstruct the conductivity distribution within D that yields the measured boundary conditions. More information on EIT theory and the development of EIT systems for the study of multiphase flows may be found in Dickin et al (1993); Jones et al (1992Jones et al ( , 1993Jones et al ( , 1994and Ceccio and George (1996).…”

Section: Electrical-impedance Tomography (Eit)mentioning

confidence: 99%

Three-phase material distribution measurements in a vertical flow using gamma-densitometry tomography and electrical-impedance tomography

George¹,

Shollenberger²,

Torczynski³

et al. 2001

International Journal of Multiphase Flow

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---Experiments are presented in which electrical-impedance tomography (EIT) and gammadensitometry tomography (GDT) measurements were combined to simultaneously measure the solid, liqui~and gas radial distributions in a vertical three-phase flow. The experimental testbed was a 19.05-cm diameter bubble column in which gas is injected at the bottom and exits out the top while the liquid and solid phases recirculate. The gas phase was air and the liquid phase was deionized water with added electrolytes. Four different particle classes were investigated for the solid phase: 40-100 pm and 120-200 pm glass beads (2.41 g/cm3), and 170-260pm and 200-700pm polystyrene beads (1.04 g/cm3), Superficial gas velocities of 3 to 30 cmk and solid volume fractions up to 0.30 were examined. For all experimental conditions investigated, the gas distribution showed only a weak dependence on both . particle size and density. Average gas volume fraction as a fimction of supert3cial gas velocity can be described to within &O.04by a curve passing through the center of the data. For most cases the solid particles appeared to be radially uniformly dispersed in the liquid.

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Section: Electrical-impedance Tomography (Eit)mentioning

confidence: 99%

Three-phase material distribution measurements in a vertical flow using gamma-densitometry tomography and electrical-impedance tomography

George¹,

Shollenberger²,

Torczynski³

et al. 2001

International Journal of Multiphase Flow

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“…More information on EIT theory and the development of EIT systems for the study of multiphase flows may be found in Dickin et al (1993); Jones et al (1992Jones et al ( , 1993Jones et al ( , 1994and Ceccio and George (1996).…”

Section: Eit Theorymentioning

confidence: 99%

“…Their main disadvantage is the long data collection times required that usually are longer than the time scales of time-dependent multiphase flows. EIT can acquire information much more quickly than GDT, but several issues with EIT have yet to be resolved, including its usefulness for multiphase flows, its spatial resolution, and its ability to make accurate quantitative measurements (Webster, 1990;Jones et al, 1993;Plaskowski et al, 1995;Ceccio and George, 1996). While capacitance sensors have been used to visualize gas-liquid slug flow (Huang et al, 1989) and flows in trickle-bed reactors (Reinecke and Mewes, 1997), the EIT technique must still be validated for quantitative phase volume fraction measurements.…”

Section: Introductionmentioning

confidence: 99%

Validation of electrical-impedance tomography for measurements of material distribution in two-phase flows

George

Torczynski

Shollenberger

et al. 2000

International Journal of Multiphase Flow

103

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“…The main disadvantage of radiation-based methods, as suggested above, is that the data collection times required are usually longer than the time scales of tirnedependent multiphase flows. EIT can acquire information much more quickly than GDT, but several issues with EIT are currently under investigation, including its usefulness for multiphase flows, its spatial resolution, and its ability to make accurate quantitative measurements (Webster, 1990;Jones et al, 1993;Plaskowski et al, 1995;Ceccio and George, 1996). While Torczynski et al (1997) were able to report successful El'I'measurements only of a dilute solid-liquid suspension, subsequent improvements to data acquisition and reduction yielded the first validated, quantitative phase distribution measurements with EIT (George et al, 1998a).…”

Section: Introductionmentioning

confidence: 99%