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Confined fluidised bed porosity in the light of bubbling-bed models

100%
Zabierowski P.
Chemical and Process Engineering
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2012
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vol. 33
|
issue 3
431-444
EN
Based on hydrodynamic data, Kato-Wen and Kunii-Levenspiel bubbling-bed model parameters, supplemented with assumptions characteristic for tested confined fluidised bed, were analysed. The calculated bubble diameters and the bed composition proved essential influence of inter-particle space of packed compacted component onto fluidisation character. The usability of the conducted model analysis was also confirmed. Finally, it can be concluded that Kunii-Levenspiel and Kato- Wen models with characteristic assumptions (for the tested bed) can be applied for calculation of the confined fluidised bed layer porosity. Discrepancies of ε f value, determined on the basis of the above mentioned bubbling-bed models do not exceed 8% of the error. The model parameters obtained from the matching the model relations to experimental data εf = f(u0) allow an analysis of the fluidisation character as well as gas velocity regime and the fluidised bed structural composition identification. A description of the regime of the process in which confined fluidised bed is characterised with an increase of mass and heat transfer rate is also possible using relation (17) derived in the present study.
2
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Modelling and Measurement of Bubble Formation and Growth in Electroflotation Processes

100%
Sarkar S. K. A., Machniewski P. M., Evans G. M.
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|
vol. 34
|
issue 3
327-336
EN
Electroflotation is used in the water treatment industry for the recovery of suspended particles. In this study the bubble formation and release of hydrogen bubbles generated electrolytically from a platinum cathode was investigated. Previously, it was found that both the growth rate and detachment diameter increased with increasing wire diameter. Conversely, current density had little effect on the released bubble size. It was also found that the detached bubbles rapidly increased in volume as they rose through the liquid as a result of decreasing hydrostatic pressure and high levels of dissolved hydrogen gas in the surrounding liquid. The experimental system was computationally modelled using a Lagrangian-Eulerian Discrete Particle approach. It was revealed that desorption of gaseous solutes from the electrolyte solution, other than hydrogen, may have a significant impact on the diameter variation of the formed bubbles. The simulation confirmed that liquid circulation, either forced or induced by the rising bubble plume, influences both the hydrogen supersaturation (concentration) in the neighbourhood of the electrode and the size of the resulting bubbles.
3
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Modelling and Measurement of Bubble Formation and Growth in Electroflotation Processes

86%
Sarkar S. K. A., Machniewski P. M., Evans G. M.
Chemical and Process Engineering
|
2013
|
issue 3
4
Publication available in full text mode
Content available

Confined fluidised bed porosity in the light of bubbling-bed models

86%
Zabierowski P.
Chemical and Process Engineering
|
2012
|
issue 3
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