References of "Leleu, David"
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See detailCoalescence in Highly Viscous System
Leleu, David ULiege; Pfennig, Andreas ULiege; Bruns, Nicole

in Proceedings of ISEC2017 (2017, November)

study of the coalescence in liquid-liquid dispersion by comparing batch settling cell experiment with a numerical tool, based on ReDrop concept.

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Peer Reviewed
See detailStandardized settling cell to characterize liquid-liquid dispersion
Leleu, David ULiege; Pfennig, Andreas ULiege

in Proceedings of ISEC2017 (2017, November)

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See detailStandardized Settling Cell to Characterize Liquid-Liquid Dispersion
Leleu, David ULiege; Pfennig, Andreas ULiege

Scientific conference (2017, November)

Continuous settlers are used in many bio-based processes for separating liquid-liquid dispersion. In an efficient process, this downstream operation must be sufficiently well designed. Since coalescence ... [more ▼]

Continuous settlers are used in many bio-based processes for separating liquid-liquid dispersion. In an efficient process, this downstream operation must be sufficiently well designed. Since coalescence depends strongly on trace components, the dispersion needs to be characterized experimentally for each material system of interest, e.g. with respect to settling time. This can be realized in a standardized settling cells at lab scale. Different standardized settling cells have been developed which lead to different characterization procedures and results. It would be desirable to find an optimal standardized settling cell. [less ▲]

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See detailCoalescence in Highly Viscous System
Leleu, David ULiege; Pfennig, Andreas ULiege; Bruns, Nicole

Poster (2017, November)

study of the coalescence in liquid-liquid dispersion by comparing batch settling cell experiment with a numerical tool, based on ReDrop concept.

Detailed reference viewed: 13 (3 ULiège)
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See detailStandardized Settling Cell Design
Leleu, David ULiege; Pfennig, Andreas ULiege

Scientific conference (2017, July)

Detailed reference viewed: 24 (1 ULiège)
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See detailStandardized Settling Cell Design
Leleu, David ULiege; Pfennig, Andreas ULiege

Scientific conference (2017, March 07)

Detailed reference viewed: 41 (4 ULiège)
See detailGel Beads to Investigate Sedimentation
Leleu, David ULiege; Pfennig, Andreas ULiege

Conference (2016, March 14)

Separation of liquid-liquid dispersions with multiple phases involves different interactions between the different dispersed species present in the system, which makes it difficult to predict e.g. the ... [more ▼]

Separation of liquid-liquid dispersions with multiple phases involves different interactions between the different dispersed species present in the system, which makes it difficult to predict e.g. the separation behaviour. Nevertheless such systems are relevant in chemical engineering e.g. for systems involving gas bubbles and simultaneously solid particles like in a fermentation broth. Models for describing the sedimentation behaviour as a basis for settler design are available in principle but have not been systematically validated for variation in size-distribution and e.g. density differences between the various species in the system. Thus, to design technical separation equipment, the separation process has to be better understood, which requires the study of the sedimentation as a first step. This project is focused on the interactions which may occur between each species during the sedimentation e.g. the effect on sedimentation of descending particles when they meet ascending drops. However, a proper study of the sedimentation with fluid phases is difficult due to other phenomena occurring simultaneously, e.g. coalescence. To overcome this issue, the use of gel beads is proposed, which due to their solid interface cannot coalesce. In addition, it is easy to define their parameters which are the density, the hardness and the size distribution. Besides, they can also be preserved during an extended period of time, experiments can thus be reproduced many times with identical beads. During the project, gel beads are designed with different particle size distributions and with different densities. Different batches of the produced gel beads will be mixed to simulate systems with different dispersed phases discriminated via density and different size distributions. With these multiple dispersed phases Experiments will be performed in a settling cell in order to evaluate the overall sedimentation velocity at certain hold up. Simultaneously a new method for measurement of local hold-up profile in the dispersion is tested, which allows hold-up measurement even in opaque systems. Finally sedimentation models found in the literature are compared and adapted to experimental results for predict the sedimentation of systems which involve different dispersed phases. In the presentation the new hold-up measurement will be presented together with an error analysis, experiments on the sedimentation of multiple dispersed phases and the model evaluation will be presented. [less ▲]

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