Prediction of bubble behaviour in fluidised beds based on solid motion and flow structure

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Colleges, School and Institutes

Abstract

It has been demonstrated that the non-intrusive positron emission particle tracking (PEPT) could be a potential technique for observing bubble flow pattern, measuring bubble size and rise velocity in bubbling fluidised beds according to the solid motion in bubble and its wake. The results indicate that the behaviour of air bubbles varies greatly with the bed materials and superficial gas velocity. Three types of bubbling patterns (namely A, B and C) have been reported in this study, in which the pattern C is observed when the polyethylene fluidised bed is operated at the superficial gas velocity (U - U-mf) of 0.25-0.5 m/s and the ratio of bed height to bed diameter is unity. After the comparison of the results measured by the PEPT technique with the values calculated by using a number of empirical correlations, two modified correlations are recommended to calculate the bubble size based on the PEPT data. (C) 2007 Elsevier B.V. All rights reserved.

Details

Original languageEnglish
Pages (from-to)358-369
Number of pages12
JournalChemical Engineering Journal
Volume140
Issue number1-3
Publication statusPublished - 1 Jan 2008

Keywords

  • bubble velocity, bubbling pattern, fluidisation, bubble size, flow structure