Methodological analysis of gamma tomography system for large random packed columns

Gamma ray tomography experiments have been carried out to detect spatial patterns in the porosity in a 0.27 m diameter column packed with steel Rashig rings of different sizes: 12.6, 37.9, and 76 mm. using a first generation CT system ( Chen et al., 1998). A fast Fourier transform tomographic recons...

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Bibliographic Details
Published in:Applied radiation and isotopes 2010-04, Vol.68 (4), p.658-661
Main Authors: Vasquez, Pablo A.S., De Mesquita, Carlos H., LeRoux, Galo A.C., Hamada, Margarida M.
Format: Article
Language:English
Subjects:
Algorithms
Gamma tomography
Gas holdup
Manufactured Materials - analysis
Materials Testing - methods
Porosity
Random packing
Spectrometry, Gamma - methods
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Summary:Gamma ray tomography experiments have been carried out to detect spatial patterns in the porosity in a 0.27 m diameter column packed with steel Rashig rings of different sizes: 12.6, 37.9, and 76 mm. using a first generation CT system ( Chen et al., 1998). A fast Fourier transform tomographic reconstruction algorithm has been used to calculate the spatial variation over the column cross section. Cross-sectional gas porosity and solid holdup distribution were determinate. The values of cross-sectional average gas porosity were ε=0.849, 0.938 and 0.966 for the 12.6, 37.9, and 76 mm rings, respectively. Radial holdup variation within the packed bed has been determined. The variation of the circumferentially averaged gas holdup in the radial direction indicates that the porosity in the column wall region is a somewhat higher than that in the bulk region, due to the effect of the column wall.
ISSN:0969-8043
1872-9800
DOI:10.1016/j.apradiso.2009.11.077