Observations of a fluidized bed using capacitance imaging

Halow, J.S.; Fasching, G.E.; Nicoletti, P.; Spenik, James

doi:10.1016/0009-2509(93)80133-b

Cited by 88 publications

(45 citation statements)

References 2 publications

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“…This makes it possible to obtain information about the solid fraction distribution within the bed at any given time. The average solid fraction value of the tower at each time step can also be calculated that can be used for statistical analyses of the bed behaviour [17,18].…”

Section: Solid Fraction Representationmentioning

confidence: 99%

A comparative study between electrical capacitance tomography and time-resolved X-ray tomography

Rautenbach

Mudde

Yang

et al. 2013

Flow Measurement and Instrumentation

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Modern day tomographs enable the research community to investigate the internal flow behaviour of a fluidized bed by non invasive methods that partially overcome the opaque nature of a dense bubbling bed. Each tomographic modality has its own limitations and advantages and in the present study two modern day tomographic systems were evaluated with respect to their performance on a cold dense fluidized bed. The two tomographs investigated are an Electrical Capacitance Tomography (ECT) tomograph and a time-resolved X-ray tomography tomograph. The study was performed on spherical glass particles with various particle size distributions that could mainly be classified as Geldart B or D particles. Two experimental towers were employed, one with a diameter of 10.4cm and the other 23.8cm while compressed air was used as fluidizing fluid during all of the experiments.Results obtained with both systems are provided in comprehensive figures and tables and some first results are obtained with the time-resolved X-ray tomography system. The bubble size measurements of both tomographs are compared with several theoretical correlations via the root mean square error of the predictions (RMSEP). With the results it was also concluded that a small amount of small particles can noticeably alter the fluidization hydrodynamics of a powder. The bubble frequencies are also presented to aid in understanding the hydrodynamic behaviour of the powders investigated. A comprehensive summary of the two tomographic modalities is also provided.

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Section: Solid Fraction Representationmentioning

confidence: 99%

A comparative study between electrical capacitance tomography and time-resolved X-ray tomography

Rautenbach

Mudde

Yang

et al. 2013

Flow Measurement and Instrumentation

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show abstract

“…Starting from the early 1990s, ECT systems have been used to investigate multiphase flow phenomena (Halow, Fasching, Nicoletti, & Spenik, 1993;Huang, Plaskowski, Xie, & Beck, 1989). Since then, more advanced ECT systems have been applied in fluidization phenomenon research (Makkawi & Wright, 2004).…”

Section: Validation With Conventional Instrumentsmentioning

confidence: 99%

Applications of capacitance tomography in gas–solid fluidized bed systems

Wang

Marashdeh

Teixeira

et al. 2015

Industrial Tomography

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“…For multiphase flows, the local material distribution can be determined from the local impedance using a mixture model if there is sufficient contrast between the electrical impedances of the materials. Several researchers have applied EIT systems to the study of gas-solid flows, including Halow et al (1993), Dyakowski et al (2000), Rao et al (2001), Warsito and Fan (2003), Makkawi and Wright (2003), and Pugsley et al (2003). These researchers have used a variety of data gathering and reconstruction methods to determine time-averaged and timevarying solids distributions.…”

Section: Electrical-impedance Tomographymentioning

confidence: 99%

Circulating fluidized bed hydrodynamics experiments for the multiphase fluid dynamics research consortium (MFDRC).

Oelfke¹,

Torczynski²,

O’Hern³

et al. 2006

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An experimental program was conducted to study the multiphase gas-solid flow in a pilot-scale circulating fluidized bed (CFB). This report describes the CFB experimental facility assembled for this program, the diagnostics developed and/or applied to make measurements in the riser section of the CFB, and the data acquired for several different flow conditions. Primary data acquired included pressures around the flow loop and solids loadings at selected locations in the riser. Tomographic techniques using gamma radiation and electrical capacitance were used to determine radial profiles of solids volume fraction in the riser, and axial profiles of the integrated solids volume fraction were produced. Computer Aided Radioactive Particle Tracking was used to measure solids velocities, fluxes, and residence time distributions. In addition, a series of computational fluid dynamics simulations was performed using the commercial code Arenaflow™.

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Observations of a fluidized bed using capacitance imaging

Cited by 88 publications

References 2 publications

A comparative study between electrical capacitance tomography and time-resolved X-ray tomography

A comparative study between electrical capacitance tomography and time-resolved X-ray tomography

Applications of capacitance tomography in gas–solid fluidized bed systems

Circulating fluidized bed hydrodynamics experiments for the multiphase fluid dynamics research consortium (MFDRC).

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