On the accuracy of Landweber and Tikhonov reconstruction techniques in gas-solid fluidized bed applications

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Abstract


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
Original languageEnglish
Pages (from-to)4102-4113
Number of pages12
JournalAIChE Journal
Volume61
Issue number12
DOIs
Publication statusPublished - Dec 2015

Keywords

  • gas-solid fluidized bed
  • electrical capacitance tomography
  • two-fluid model
  • Landweber and Tikhonov reconstruction
  • accuracy analysis

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