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

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Goldschmidt, M.J.V. and Link, J.M. and Mellema, S. and Kuipers, J.A.M. (2003) Digital image analysis measurements of bed expansion and segregation dynamics in dense gas-fluidized beds. Powder Technology, 138 (2-3). pp. 135-159. ISSN 0032-5910

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Abstract: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.
Item Type:Article
Copyright:© 2003 Elsevier B.V.
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Link to this item:http://purl.utwente.nl/publications/40854
Official URL:http://dx.doi.org/10.1016/j.powtec.2003.09.003
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Metis ID: 215439