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See detailLiquid flooded compression and expansion in scroll machines - Part II: Experimental testing and model validation
Bell, Ian ULg; Lemort, Vincent ULg; Groll, Eckhard et al

in International Journal of Refrigeration (2012), 35

The use of liquid-flooding in the compression and expansion of non-condensable gas in scroll compressors and expanders enables the possibility of quasi-isothermal working processes. Liquid-flooded scroll ... [more ▼]

The use of liquid-flooding in the compression and expansion of non-condensable gas in scroll compressors and expanders enables the possibility of quasi-isothermal working processes. Liquid-flooded scroll machines were installed in a fully-instrumented Liquid- Flooded Ericsson Cycle test rig to conduct entire cycle performance tests. In addition, detailed compressor and expander performance data was obtained. Oil mass fractions of up to 92% and 76% were added to the gas entering the scroll compressor and expander respectively. The overall isentropic efficiency of the scroll compressor based on the shaft power with flooding was up to 73% and the volumetric efficiency was above 92%. For the expander, the best overall isentropic and volumetric efficiencies achieved were 66% and 105% respectively. The mechanistic model presented in the companion paper was vali- dated against the experimental data for both the compressor and the scroll expander with good agreement, though the agreement is better for the scroll compressor. [less ▲]

Detailed reference viewed: 33 (4 ULg)
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See detailLiquid flow distribution in catalytic distillation columns : use of high-energy X-ray tomography
Aferka, Saïd ULg; Saroha, Anil; Toye, Dominique ULg et al

in AIChE (Ed.) AIChE Annual Meeting, Conference Proceedings, San Francisco, CA, United States, Nov. 12-17, 2006 (2006)

Detailed reference viewed: 11 (3 ULg)
Peer Reviewed
See detailLiquid flow maldistribution in trickle-bed reactors
Crine, Michel ULg; Marchot, Pierre ULg; L'Homme, Guy ULg

in Chemical Engineering Communications (1980), 7

Detailed reference viewed: 30 (17 ULg)
Peer Reviewed
See detailLiquid hold-up measurement in Mellapak Plus 752Y packed bed using X-ray tomography
Aferka, Saïd ULg; Viva, Aurora ULg; Brunazzi, Elisabetta et al

in VCIPT (Ed.) Proceedings of 6th World Congress On Industrial Process Tomography (WCIPT6), Beijing, China, 6-9 Septembre 2010 (2010)

Detailed reference viewed: 75 (9 ULg)
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See detailLiquid ilmenite or liquidus ilmenite: a comment on the nature of ilmenite vein deposits
Duchesne, Jean-Clair ULg

in Demaiffe, Daniel (Ed.) Petrology and geochemistry of magmatic suites of rocks in the continental and oceanic crust (a volume dedicated to Professor Jean Michot) (1996)

The interstitial character of ilmenite in common gabbroidic rocks has led to the idea that the last drop of liquid to crytallize in a rock could be pure ilmenite. When injected into enclosing rocks this ... [more ▼]

The interstitial character of ilmenite in common gabbroidic rocks has led to the idea that the last drop of liquid to crytallize in a rock could be pure ilmenite. When injected into enclosing rocks this liquid could give rise to ilmenite-pure veins. Fractional crystallization or immiscibility cannot produce a pure ilmenite melt. Actually, ilmenite is a liquidus mineral, which is the first or among the first mafic minerals to crystallize in Fe-Ti rich magmas. This is clearly shown by the sequence of crystallization in the Bjerkreim-Sokndal layered intrusion, by quantitative modelling of the liquid line of descent of jotunitic (hypersthene monzodioritic) magmas, and by experimental work. The interstitial character of ilmenite is therefore acquired subsolidus. Deformation can enhance the process. The synemplacement deformation linked to the diapiric uprise of anorthosite massifs is a suitable environment for the formation of layers of Cr- and Mg-rich ilmenite and their subsequent deformation and mobilization in discordant veins of pure ilmenite. [less ▲]

Detailed reference viewed: 128 (3 ULg)
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See detailLiquid load point determination in a reactive distillation packing by x-ray tomography
Aferka, Saïd ULg; Viva, Aurora ULg; Brunazzi, Elisabetta et al

in Canadian Journal of Chemical Engineering (2010), 88(4), 611-617

In this paper, we report on the use of Xray tomography to determine the liquid load point in 0.1m diameter modular catalytic distillation packings KatapakSP11 and KatapakSP12. The liquid load point ... [more ▼]

In this paper, we report on the use of Xray tomography to determine the liquid load point in 0.1m diameter modular catalytic distillation packings KatapakSP11 and KatapakSP12. The liquid load point corresponds to the overall packed bed liquid load above which there is an increment in the liquid flowing outside the catalytic baskets and the catalytic baskets themselves are saturated with liquid. From tomographic images, we show that several factors affect the wetting and filling of catalytic baskets. The complex hybrid structure of catalytic packings influences the liquid distribution inside the elements. The liquid preferentially fills the external catalytic baskets because they receive the liquid not only from the packing element situated above but also from the wall wipers. Moreover, liquid holdup inside a catalytic basket section depends significantly on the vertical position in the packing element and on the position of the packing in the column packed bed. The counter–current gas flow speeds up the process of liquid filling of the baskets, also for low liquid loads. The nonuniform distribution of liquid in catalytic basket which is observed experimentally makes the identification of a unique liquid load point not straightforward. [less ▲]

Detailed reference viewed: 57 (15 ULg)
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See detailLiquid load point measurement in a reactive distillation packing by x-ray tomography
Aferka, Saïd ULg; Viva, Aurora ULg; Brunazzi, Elisabetta et al

Poster (2009, August)

Detailed reference viewed: 54 (11 ULg)
See detailLiquid oxygen compatibility of materials for space propulsion needs
Bozet, Jean-Luc ULg; Heyen, Georges ULg; Dodet, Claude ULg et al

in 4TH EUROPEAN CONFERENCE FOR AEROSPACE SCIENCES (EUCASS) (2011)

Since the origin, the use of liquid oxygen as oxidizer is widespread in space propulsion. It has been the source of numerous incidents. Many materials can burn violently in an oxygen enriched environment ... [more ▼]

Since the origin, the use of liquid oxygen as oxidizer is widespread in space propulsion. It has been the source of numerous incidents. Many materials can burn violently in an oxygen enriched environment when ignited. Consequently, it is mandatory to perform oxygen compatibility tests. In the present work, compatibility tests are impact tests and auto ignition tests. Both standardized test methods are illustrated by test results on polymeric materials (i.e. fluorinated resins, polyimides, polyetherketone) for seals and ball bearing cage. For future needs, in order to face the increase of pressure of injection of propellants in cryogenic engines, the adiabatic compression test has been identified as well suited for qualifying materials as oxygen compatible in highly constraining conditions. Details on the test procedure and on the installation available at the Université de Liège are presented. [less ▲]

Detailed reference viewed: 6 (0 ULg)
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See detailLiquid-flooded compression and expansion in scroll machines - Part I: Model development
Bell, Ian ULg; Lemort, Vincent ULg; Groll, Eckhard et al

in International Journal of Refrigeration (2012)

A detailed mechanistic model has been developed for scroll compressors and scroll expanders with liquid flooding for application to the Liquid Flooded Ericsson Cycle. This model is based on the ... [more ▼]

A detailed mechanistic model has been developed for scroll compressors and scroll expanders with liquid flooding for application to the Liquid Flooded Ericsson Cycle. This model is based on the integration of a set of differential equations that arise from the conservation laws. The impact of the flooding liquid on the working process is also included through mixture properties as well as treatment of two-phase flow pressure drop. With the working process known, it is then possible to solve for the compressor power, total mass flow rate and other model outputs. The fine level of detail in the model allows for the investigation of the impact of design changes to the scroll machines. This model can also be readily extended to allow for the analysis of liquid flooded vapor compression refrigeration. [less ▲]

Detailed reference viewed: 28 (7 ULg)
See detailLiquidation des créances et récompenses au titre d'investissements immobiliers
Leleu, Yves-Henri ULg

in Casman, Hélène; Leleu, Yves-Henri; Verbeke, Alain (Eds.) Le droit patrimonial de la famille sans préjugés (2002)

Detailed reference viewed: 37 (4 ULg)
See detailLiquidation des créances et récompenses au titre d'investissements immobiliers
Leleu, Yves-Henri ULg

in Leleu, Yves-Henri; Casman, Hélène; Verbeke, Alain (Eds.) Le droit des régimes matrimoniaux en pratique (2002)

Detailed reference viewed: 33 (3 ULg)
See detailLa liquidation des sociétés commerciales : nouveaux ingrédients pour une vieille recette
Aydogdu, Roman ULg

Conference given outside the academic context (2012)

Detailed reference viewed: 31 (8 ULg)
See detailLa liquidation des sociétés commerciales: les droits des créanciers
Georges, Frédéric ULg

in La liquidation des sociétés commerciales: les droits des créanciers, rapport rédigé dans le cadre du colloque (1999)

Detailed reference viewed: 73 (9 ULg)
See detailLa liquidation-partage, in Droit judiciaire notarial
Dehalleux, Virginie ULg; Parent, Xavier ULg; Maquet, Bernard ULg et al

in Leleu, Yves-Henri (Ed.) Chroniques Notariales Université de Liège (2007)

Detailed reference viewed: 41 (5 ULg)
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See detailUn liquide de perfusion pour le cœur des poissons osseux marins
Fredericq, Léon ULg

in Archives Internationales de Physiologie (1922), XX

Detailed reference viewed: 5 (0 ULg)
See detailLiquidiation du régime matrimonial. Actualités de jurisprudence
Leleu, Yves-Henri ULg

in Leleu, Yves-Henri (Ed.) Actualités de droit familial. Le point en 2003 (2003)

Detailed reference viewed: 29 (5 ULg)
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See detailLiquidité des titres, communication financière et gouvernance d’entreprise
Ajina, Aymen ULg

Doctoral thesis (2013)

A travers ce travail doctoral, nous cherchons à étudier l’influence des mécanismes de gouvernance d’entreprise sur la liquidité des titres. Nous nous focalisons aussi sur l’efficacité et la qualité du ... [more ▼]

A travers ce travail doctoral, nous cherchons à étudier l’influence des mécanismes de gouvernance d’entreprise sur la liquidité des titres. Nous nous focalisons aussi sur l’efficacité et la qualité du système de gouvernance en passant d’une étude fragmentée des mécanismes de contrôle à une étude systémique de la gouvernance d’entreprise. Les résultats défendent une orientation législative française envers l’adoption de certaines normes pour la bonne conduite de la gouvernance d’entreprise. L’étendue des informations publiées dans les rapports annuels augmente la visibilité d’une entreprise, réduit éventuellement l’asymétrie d’informations et augmente la liquidité des titres. Ces effets sont d’autant plus prononcés par l’application des normes IFRS rendues obligatoires à partir de 2005. Par ailleurs, nous montrons que le développement de la demande d’actionnariat institutionnel est une nécessité pour le marché parisien, afin de favoriser sa croissance de façon générale et soutenir sa liquidité. Nous mettons en évidence également un impact positif de la taille du conseil d’administration, de l’indépendance et de l’expertise financière des administrateurs, et du nombre des réunions du conseil sur la liquidité des titres. De même, le comité d’audit offre un support indispensable pour prévenir le risque « d’illiquidité ». [less ▲]

Detailed reference viewed: 124 (27 ULg)