ORCID Profile
0000-0002-5549-7937
Current Organisation
Laboratoire de génie chimique
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Publisher: IATED
Date: 03-2020
Publisher: Elsevier BV
Date: 05-2012
Publisher: Frontiers Media SA
Date: 09-06-2020
Publisher: IM Publications Open LLP
Date: 09-06-2015
DOI: 10.1255/TOSF.46
Publisher: Informa UK Limited
Date: 04-1998
Publisher: Elsevier BV
Date: 2011
Publisher: Elsevier BV
Date: 10-2009
Publisher: Elsevier BV
Date: 03-2010
Publisher: Hosokawa Powder Technology Foundation
Date: 2014
Publisher: Elsevier BV
Date: 05-2002
Publisher: Hosokawa Powder Technology Foundation
Date: 2018
Publisher: AIP Publishing
Date: 09-2022
DOI: 10.1063/5.0099985
Abstract: Tangential introduction of liquid results in a swirling flow within a cylindro-conical hydrocyclone. Upon continuous feeding with water, the central axial region experiences local low pressure across the height yielding the formation of an air-core, which executes meandering motion similar to the oscillation of an elastic string. We investigated the vortical flow and the induced oscillating behavior of an air column submerged in a water flow field inside a hydrocyclone. Through a series of experiments in a transparent hydrocyclone and subsequent full scale multiphase flow simulations with the Reynolds stress model, we analyzed the morphological characteristics of the air-core (mean and fluctuating properties). Air-core oscillations are characterized in terms of spatial wavelength and frequency. We show that hydrodynamics driven oscillating behavior of the air-core shares an analogy with the vibration of an elastic beam. Following this analogy, we obtain a scaling relationship between the wavelength and air-core radius, which is in good agreement with our experimental data and numerical results.
Publisher: Elsevier BV
Date: 02-2015
Publisher: Elsevier BV
Date: 05-2014
Publisher: Elsevier BV
Date: 04-1997
Publisher: Frontiers Media SA
Date: 19-11-2020
Publisher: Elsevier BV
Date: 03-2013
Publisher: Wiley
Date: 21-07-2010
Publisher: Elsevier BV
Date: 05-2012
Publisher: Informa UK Limited
Date: 05-2000
Publisher: Elsevier BV
Date: 05-2012
Publisher: Elsevier BV
Date: 04-2022
Publisher: Frontiers Media SA
Date: 04-08-2022
DOI: 10.3389/FCLIM.2022.946735
Abstract: The main obstacle to the aqueous carbonation of non-serpentinised magnesium silicates is the formation of surface passivation layers, which severely limits the reaction rate and thus the overall efficiency of the process. A technological solution to overcome this problem is to perform the carbonation process inside a stirred bead mill, which aims to continuously remove the surface by-product layers by attrition. In this work, the aqueous carbonation of ferronickel slag, a mineralogically complex mining waste composed of a Mg/Si rich amorphous phase and a crystalline ferrous forsterite, was studied at 150°C and under 10 bar of CO 2 with different operating configurations: carbonation alone (C mode), attrition followed by carbonation (A-C mode) and concomitant attrition and carbonation (AC mode). By careful observation of the mineralogy and the surface of the secondary phases formed using complementary analytical techniques, the article allows a better understanding of the passivation phenomenon inherent to the carbonation of magnesium silicates, and confirms the effectiveness of continuous surface mechanical depassivation for reaching high carbonation rates with this type of material. Comparative analysis of the products obtained with the three operating modes shows that a true synergy takes place between attrition and carbonation due to the combined effect of continuous exfoliation and mechanical activation of particle surface, which goes far beyond the simple increase in surface area due to particle size reduction. While mechanical depassivation is here substantiated by several evidence, the additional mechanochemical activation effect cannot be delineated from experiment however its beneficial contribution to carbonation is inferred from its observation in A-C mode. The work finds that the synergy between attrition and carbonation also yields very characteristic products. They consist in micrometric agglomerates formed by bound spherical particles a few tens of nanometers in size. These particles themselves contain an entanglement of nanometric grains of carbonates and amorphous silica dispersed inside a magnesium-depleted alumino-siliceous matrix. These results confirm that concomitant attrition and carbonation offers one of the most promising pathways for developing direct aqueous carbonation processes with non-thermally activatable magnesium silicates.
Publisher: AIP
Date: 2013
DOI: 10.1063/1.4812079
Publisher: Elsevier BV
Date: 03-2018
Publisher: Informa UK Limited
Date: 07-2012
DOI: 10.1080/19440049.2012.675594
Abstract: Many countries receive shipments of bulk cereals from primary producers. There is a volume of work that is on-going that seeks to arrive at appropriate standards for the quality of the shipments and the means to assess the shipments as they are out-loaded. Of concern are mycotoxin and heavy metal levels, pesticide and herbicide residue levels, and contamination by genetically modified organisms (GMOs). As the ability to quantify these contaminants improves through improved analytical techniques, the s ling methodologies applied to the shipments must also keep pace to ensure that the uncertainties attached to the s ling procedures do not overwhelm the analytical uncertainties. There is a need to understand and quantify s ling uncertainties under varying conditions of contamination. The analysis required is statistical and is challenging as the nature of the distribution of contaminants within a shipment is not well understood very limited data exist. Limited work has been undertaken to quantify the variability of the contaminant concentrations in the flow of grain coming from a ship and the impact that this has on the variance of s ling. Relatively recent work by Paoletti et al. in 2006 [Paoletti C, Heissenberger A, Mazzara M, Larcher S, Grazioli E, Corbisier P, Hess N, Berben G, Lübeck PS, De Loose M, et al. 2006. Kernel lot distribution assessment (KeLDA): a study on the distribution of GMO in large soybean shipments. Eur Food Res Tech. 224:129-139] provides some insight into the variation in GMO concentrations in soybeans on cargo out-turn. Paoletti et al. analysed the data using correlogram analysis with the objective of quantifying the s ling uncertainty (variance) that attaches to the final cargo analysis, but this is only one possible means of quantifying s ling uncertainty. It is possible that in many cases the levels of contamination passing the s ler on out-loading are essentially random, negating the value of variographic quantitation of the s ling variance. GMOs and mycotoxins appear to have a highly heterogeneous distribution in a cargo depending on how the ship was loaded (the grain may have come from more than one terminal and set of storage silos) and mycotoxin growth may have occurred in transit. This paper examines a statistical model based on random contamination that can be used to calculate the s ling uncertainty arising from primary s ling of a cargo it deals with what is thought to be a worst-case scenario. The determination of the s ling variance is treated both analytically and by Monte Carlo simulation. The latter approach provides the entire s ling distribution and not just the s ling variance. The s ling procedure is based on rules provided by the Canadian Grain Commission (CGC) and the levels of contamination considered are those relating to allowable levels of ochratoxin A (OTA) in wheat. The results of the calculations indicate that at a loading rate of 1000 tonnes h(-1), primary s le increment masses of 10.6 kg, a 2000-tonne lot and a primary composite s le mass of 1900 kg, the relative standard deviation (RSD) is about 1.05 (105%) and the distribution of the mycotoxin (MT) level in the primary composite s les is highly skewed. This result applies to a mean MT level of 2 ng g(-1). The rate of false-negative results under these conditions is estimated to be 16.2%. The corresponding contamination is based on initial average concentrations of MT of 4000 ng g(-1) within average spherical volumes of 0.3 m diameter, which are then diluted by a factor of 2 each time they pass through a handling stage four stages of handling are assumed. The Monte Carlo calculations allow for variation in the initial volume of the MT-bearing grain, the average concentration and the dilution factor. The Monte Carlo studies seek to show the effect of variation in the s ling frequency while maintaining a primary composite s le mass of 1900 kg. The overall results are presented in terms of operational characteristic curves that relate only to the s ling uncertainties in the primary s ling of the grain. It is concluded that cross-stream s ling is intrinsically unsuited to s ling for mycotoxins and that better s ling methods and equipment are needed to control s ling uncertainties. At the same time, it is shown that some combination of cross-cutting s ling conditions may, for a given shipment mass and MT content, yield acceptable s ling performance.
Publisher: Elsevier BV
Date: 04-1993
Publisher: Elsevier BV
Date: 2014
Publisher: Elsevier BV
Date: 05-2012
Publisher: Elsevier BV
Date: 03-2015
Publisher: Elsevier BV
Date: 07-2012
Publisher: Elsevier BV
Date: 06-2013
No related grants have been discovered for Florent Bourgeois.