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

Autor: Jam Hans Kuipers, S Mellema, JM Link, Mjv Goldschmidt
Přispěvatelé: Multi-scale Modelling of Multi-phase Flows
Rok vydání: 2003
Předmět:
Zdroj: Powder Technology, 138(2-3), 135-159. Elsevier
Powder technology, 138(2-3), 135-159. Elsevier
ISSN: 0032-5910
DOI: 10.1016/j.powtec.2003.09.003
Popis: 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.
Databáze: OpenAIRE
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