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On the accuracy of Landweber and Tikhonov reconstruction techniques in gas‐solid fluidized bed applications
Author(s) -
Banaei M.,
van Sint Annaland M.,
Kuipers J. A. M,
Deen N. G.
Publication year - 2015
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.14976
Subject(s) - tikhonov regularization , bubble , mechanics , fluidized bed , noise (video) , electrical capacitance tomography , volume fraction , algorithm , materials science , mathematics , statistical physics , computer science , physics , artificial intelligence , thermodynamics , mathematical analysis , capacitance , inverse problem , composite material , electrode , quantum mechanics , image (mathematics)
As electrical capacitance tomography technique needs a sophisticated reconstruction, the accuracy of two of the most widely used reconstruction techniques (Landweber and Tikhonov) for gas‐fluidized bed applications were assessed. For this purpose, the results of two‐fluid model simulations were used as an input of reconstruction. After finding the optimum reconstruction parameters for the studied system, it is found that both techniques were able to obtain the radial profile and overall value of average volume fraction very well. Conversely, both methods were incapable to determine bubble sizes accurately especially small bubble sizes, unless the Landweber technique with inverted Maxwell concentration model is applied. The probability distribution of the reconstructed results was also smoother in transition between the emulsion and bubble phases compared to the reality. Finally, no significant differences in noise immunity of these two techniques were observed. © 2015 American Institute of Chemical Engineers AIChE J , 61: 4102–4113, 2015