Linear stability analysis of gas-fluidized beds for the prediction of incipient bubbling conditions

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Abstract

This work focuses on the development of a novel linear stability criterion for the state of homogeneousfluidization regime, based on a new mathematical model for gas-fluidized beds. The model is developedstarting from the well-known particle bed model. A mono-dimensional momentum balance is derivedleading to a set of equations which explicitly include voidage-gradient dependent terms (elastic force)for both solid and fluid phases.A fully predictive criterion for the stability of homogeneous fluidization state is here proposed, basedon the well-known Wallis’ linear stability analysis. The criterion requires the choice of an appropriateaveraging distance, which in the present development is found to be bed-voidage dependent. The linearstability criterion resulted in turn in a simple, yet fully predictive, relationship for incipient bubblingvoidage.Validation was carried out analyzing the influence of all physical properties and sensitivity to closurerelations, showing substantial agreement with literature data.
Lingua originaleEnglish
pagine (da-a)489-500
Numero di pagine11
RivistaChemical Engineering Journal
Volume157
Stato di pubblicazionePublished - 2010

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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