Stability analysis in solid-liquid fluidized beds: experimental and computational

Show simple item record Ghatage, Swapnil V. Peng, Zhengbiao Sathe, Mayur J. Doroodchi, Elham Padhiyar, Nitin Moghtaderi, Behdad Joshi, Jyeshtharaj B. Evans, Geoffrey M. 2014-07-21T14:34:50Z 2014-07-21T14:34:50Z 2014-11
dc.identifier.citation Ghatage, Swapnil V.; Peng, Zhengbiao; Sathe, Mayur J.; Doroodchi, Elham; Padhiyar, Nitin; Moghtaderi, Behdad; Joshi, Jyeshtharaj B. and Evans, Geoffrey M., “Stability analysis in solid-liquid fluidized beds: experimental and computational", Chemical Engineering Journal, DOI: 10.1016/j.cej.2014.06.026, Jul. 2014. en_US
dc.identifier.issn 1385-8947
dc.description.abstract In this study the transition from homogeneous to heterogeneous flow in a solid-liquid fluidized bed (SLFB) is examined both experimentally and numerically. The experimental apparatus comprised a refractive index-matched SLFB, comprising 5 mm diameter borosilicate glass and sodium iodine solution, which allowed for both instantaneous particle image velocimetry of the liquid flow field and solids hold-up measurements to be undertaken for superficial liquid velocities in the range of 0.06-0.22 m/s. The motion of individual, spherical steel balls (with diameters 6, 7, 8, 9 mm) was then tracked as it settled through the fluidized bed for differing superficial liquid velocities. It was observed that, for all the steel balls covered in this work, there was a change in slope in their respective classification velocity curves at a superficial liquid velocity of 0.08 m/s. This value was very close to the critical velocity of 0.085 m/s predicted from 1-D linear stability analysis; and therefore deemed to be the critical condition that marked the transition from homogeneous to non-homogenous flow. It is proposed that the change in slope of the classification velocity curve is due to the encounter of the settling foreign particles with liquid bubbles whose presence marks the onset of heterogeneous flow. Additional computational analysis, involving both Eulerian – Eulerian (E-E) and Eulerian – Lagrangian (E-L) approaches, is used to confirm the presence of liquid bubbles at a critical liquid hold-up of 0.54, which corresponds to that predicted from 1-D linear stability analysis. In summary, the study has highlighted that experimentally the transition condition for a SLFB can be obtained simply by observing the behaviour of the classification velocity of a single foreign particle at different superficial liquid velocities. This transition condition was found to agree with the 1D linear stability criterion, Eulerian-Eulerian CFD (3D) and Eulerian-Lagrangian DEM (3D) approaches. en_US
dc.description.statementofresponsibility by Swapnil V. Ghatage, Zhengbiao Peng, Mayur J. Sathe, Elham Doroodchi, Nitin Padhiyar, Behdad Moghtaderi, Jyeshtharaj B. Joshi and Geoffrey M. Evans
dc.format.extent vol. 256, pp. 169–186
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.subject Computational fluid dynamics en_US
dc.subject Discrete element modeling en_US
dc.subject Fluidized beds en_US
dc.subject Particle image velocimetry en_US
dc.subject Stability en_US
dc.title Stability analysis in solid-liquid fluidized beds: experimental and computational en_US
dc.type Article en_US
dc.relation.journal Chemical Engineering Journal

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