The bubbling behaviour of fluidized beds has been thoroughly investigatedin the last decades by means of several techniques, e.g. X-ray, Inductance, Resistanceand Impedance based techniques, PIV. In recent years, Digital Image Analysis Techniques have shown their potential for accurate and cost effectivelymeasurements.Most of the work related to bubble behaviour analysis deals with Single-sized particles,while almost all industrial equipment operates with multi-sized particles.Although considerable work has been done in the past with focus on the analysis of the mixing-segregation behaviour and predictions of fluid dynamics regime transitions, a lack of knowledge still exists in the analysis of bubbles properties measurements for the case of polydispersed systems.In this work, digital image analysis has been adopted to accurately measure fundamental global parameters such as bubble hold up and bed expansion as well as average bubble hold-up distribution maps or bubble size distributions in bubblingfluidized beds of binary mixtures of particles. The experiments have been carried out at steady state conditions with binary mixtures of corundum particles, at various inlet gas velocities. This preliminary study has been performed with the aim to collect valuable data for future development of predictive models and validationof CFD codes.
|Numero di pagine||17|
|Rivista||International Journal of Chemical Reactor Engineering|
|Volume||10, ARTICLE 25|
|Stato di pubblicazione||Published - 2012|
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