Digital image analysis measurements of bed expansion and segregation dynamics in dense gas-fluidized beds

M.J.V. Goldschmidt, J.M. Link, S. Mellema, J.A.M. Kuipers

    Research output: Contribution to journalArticleAcademicpeer-review

    163 Citations (Scopus)


    One of the most crucial steps in the development of fundamental hydrodynamic models is the validation of these models with accurate, detailed experimental data. Therefore a whole-field, non-intrusive digital image analysis technique has been developed which enables measurement of bed expansion and segregation dynamics of coloured particles in dense gas-fluidised beds. The development, calibration and accuracy of the technique are discussed in detail. The image analysis technique traces bubbles and voidage waves accurately, whereas the mixture composition in a fluidised bed could be determined within 10%. Experiments have been carried out with 1.5 and 2.5 mm coloured glass beads, for which particle¿particle and particle¿wall collision parameters were accurately known. They were performed in pseudo two-dimensional laboratory scale fluidised beds with a simple rectangular geometry and well-defined gas inflow conditions. An extensive set of results obtained with both mono-disperse systems and binary mixtures, suitable for validation of fundamental hydrodynamic models, is presented.
    Original languageUndefined
    Pages (from-to)135-159
    Number of pages24
    JournalPowder technology
    Issue number2-3
    Publication statusPublished - 2003


    • IR-40854
    • METIS-215439

    Cite this