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Peer Reviewed
See detailExperimental study of a randomly agitated 2D granular pile
Lumay, Geoffroy ULg

Conference (2006, June 09)

Detailed reference viewed: 1 (1 ULg)
Peer Reviewed
See detailExperimental study of a river biofilm growth on artificial cobbles in contrasted flow conditions
Moulin, F.; Peltier, Yann ULg; Pen, C. et al

in International Workshop on Environmental Hydraulics (2009)

Detailed reference viewed: 7 (1 ULg)
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See detailExperimental study of a vertical column of grains submitted to a series of impulses
Lumay, Geoffroy ULg; Dorbolo, Stéphane ULg; Gerasimov, Oleg et al

in European Physical Journal E -- Soft Matter (2013), 36

Detailed reference viewed: 35 (14 ULg)
Peer Reviewed
See detailExperimental study of air-hydrogen heat exchangers
Hendrick, Patrick; Heintz, N.; Bizzarri, Didier et al

in The 15th AIAA International Space Planes and Hypersonic Systems and Technologies Conference . April 28- May 1 2008 (2008, April)

Detailed reference viewed: 20 (1 ULg)
Peer Reviewed
See detailExperimental Study Of An In-Flight Air Separation Device
Bizzarri, Didier; Hendrick, Patrick; Heyen, Georges ULg et al

in AIAA/CIRA 13th International Space Planes and Hypersonics Systems and Technologies Conference (2005, May)

Intending to provide in-flight Oxygen Collection capability to new launchers, a subscale model of a centrifugally enhanced air distillation unit is under development. The vehicle we foresee for this ... [more ▼]

Intending to provide in-flight Oxygen Collection capability to new launchers, a subscale model of a centrifugally enhanced air distillation unit is under development. The vehicle we foresee for this application is described elsewhere, the present paper concentrating only on the technological and experimental aspects. While the test setup has already been shown to be able to provide the adequate cooling power, the rig is still under construction. The experimental and technical aspects include choices and main trade-offs that had to be made during the design process. Of particular interest are the stainless steel all welded heat exchangers allowing for deep cooling and liquefaction of air from the main compressor and dryers. Specifically, developed hardware is described in details. On the test rig side, design of the rotating cryogenic separator is explained, including mechanical aspects, heat management and sealing. The whole system has modes of operation allowing, among other parameters, to explore various air compositions and mass flows rates on the gaseous and liquid sides. Perspectives are given for the testing of the separator. [less ▲]

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See detailExperimental study of cracking induced by desiccation in 1-dimensional systems
Lecocq, N.; Vandewalle, Nicolas ULg

in European Physical Journal E -- Soft Matter (2002), 8(4), 445-452

We designed a simple experiment to study both the dynamical and statistical properties of cracking that occurs in a one-dimensional system composed of wet clay (or similar material) exposed to shrinkage ... [more ▼]

We designed a simple experiment to study both the dynamical and statistical properties of cracking that occurs in a one-dimensional system composed of wet clay (or similar material) exposed to shrinkage induced by desiccation. We study both the dynamical formation of cracks and the statistical characteristics of the final cracks pattern. We observe that the drying rate has a strong influence on the way cracks appear and grow. We find that the final crack width is related to the order of apparition of the cracks. We discuss the statistical distributions of cracks width and separation between two adjacent cracks. We also study the correlations between these two quantities. Our results are compared to the predictions of existing models. Finally, a comparison with another kind of clay is made. [less ▲]

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See detailExperimental study of granular compaction dynamics at different scales: Grain mobility, hexagonal domains, and packing fraction
Lumay, Geoffroy ULg; Vandewalle, Nicolas ULg

in Physical Review Letters (2005), 95(2), 28002

We present an original experimental study of the compaction dynamics for two-dimensional granular systems. Compaction dynamics is measured at three different scales: the macroscopic scale through the ... [more ▼]

We present an original experimental study of the compaction dynamics for two-dimensional granular systems. Compaction dynamics is measured at three different scales: the macroscopic scale through the normalized packing fraction rho, the mesoscopic scale through the normalized fraction phi of hexagonal domains in the system, and the microscopic scale through the grain mobility mu. Moreover, the hexagonal domains are found to obey a growth process dominated by the displacement of domain boundaries. A global picture of compaction dynamics relevant at each scale is proposed. [less ▲]

Detailed reference viewed: 9 (2 ULg)
See detailExperimental study of phase transformations in medium-carbon steels
Mertens, Anne ULg; Brown, Andrew J.; Sietsma, Jilt

Scientific conference (2003, September 04)

Detailed reference viewed: 5 (1 ULg)
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See detailExperimental Study of Stall-Induced LCOs of Free Vibrating Wing
Li, Jing; Dimitriadis, Grigorios ULg

in Proceedings of the 2007 International Forum on Aeroelasticity and Structural Dynamics (2007, June)

Stall flutter is a limit cycle oscillation phenomenon occurring when all or part of the flow over a wing separates and re-attaches periodically. This paper reports on experimental investigations carried ... [more ▼]

Stall flutter is a limit cycle oscillation phenomenon occurring when all or part of the flow over a wing separates and re-attaches periodically. This paper reports on experimental investigations carried out on the subsonic stall flutter of a pitch plunge wing wind tunnel model. The object of the experiments was to investigate the aeroelastic effects of the nonlinearity introduced by boundary layer growth and flow separation and the ensuing stall-induced flutter, on a freely vibrating aeroelastic system. The motion of the wing and the pressure distribution around its surface were measured at various conditions. Three types of motion were observed, sometimes at the same wind tunnel airspeed; decay to equilibrium, symmetric limit cycle oscillations (LCO) and asymmetric LCOs. The aerodynamic mechanisms that give rise to these LCOs are described and analyzed. The effect of torsional wing stiffness on the stall flutter response of the wing is also investigated. Finally, repeating the experiments in a smaller wind tunnel showed that wind tunnel blockage has a significant effect on stall flutter. [less ▲]

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See detailExperimental study of the charring rate of tropical hardwoods
Njankouo, Jacques Michel; Dotreppe, Jean-Claude ULg; Franssen, Jean-Marc ULg

in Fire & Materials (2004), 28(1, JAN-FEB), 15-24

This paper describes an experimental investigation of the charring rates of timber. An experimental procedure was designed for assessing the charring rate of 20 specimens exposed to fire in a single test ... [more ▼]

This paper describes an experimental investigation of the charring rates of timber. An experimental procedure was designed for assessing the charring rate of 20 specimens exposed to fire in a single test, with one-dimensional heat transfer conditions. Each test specimen was manufactured by gluing seven laminates together. Four thermocouples were inserted at different depths in four different laminates located in the middle of the test specimen. The test was conducted using a gas-fired furnace and specimens were exposed to the standard ISO 834 fire. In order to evaluate the fire performance of tropical hardwoods, seven different species with densities ranging from 500 to 1000 kg/m(3) were used. For the purpose of verifying the experimental procedure against existing data, two softwood species (spruce and fir) and one European hardwood species (oak) were also examined. Experimental results indicate that the test method and procedure can be used for assessing the charring rate of timber both for softwood and for hardwood species. They also show that the density of wood significantly affects the charring rate and that the values recommended in Eurocode 5 for high densities are somewhat too conservative. Copyright (C) 2004 John Wiley Sons, Ltd. [less ▲]

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See detailExperimental study of the compaction dynamics for two-dimensional anisotropic granular materials
Lumay, Geoffroy ULg; Vandewalle, Nicolas ULg

in Physical Review E (2006), 74(2, Pt 1), 21301

We present an experimental study of the compaction dynamics for two-dimensional anisotropic granular systems. The compaction dynamics of rods is measured at three different scales: (i) the macroscopic ... [more ▼]

We present an experimental study of the compaction dynamics for two-dimensional anisotropic granular systems. The compaction dynamics of rods is measured at three different scales: (i) the macroscopic scale through the packing fraction rho, (ii) the mesoscopic scale through both fractions of aligned grains phi(a) and ideally ordered grains phi(io), and (iii) the microscopic scale through both rotational and translational grain mobilities mu(r,t). At the macroscopic scale, we have observed two stages during the compaction process, suggesting different characteristic time scales for grain relaxation. At the mesoscopic scale, we have observed the formation and the growth of domains made of aligned grains during the first stage of compaction. At the late stage, these domains of aligned grains are sheared to form ideally ordered domains. From a microscopic point of view, measurements reveal that the beginning of the compaction process is essentially related to translational motions of the grains. The grain rotations drive mainly the process during the late stages of compaction. [less ▲]

Detailed reference viewed: 17 (3 ULg)
Peer Reviewed
See detailExperimental study of the drying kinetic of mortar
Kahlerras, Loubna ULg

Conference (2014, August 24)

This work reports the results of an experimental study concerning on one hand the influence of water-to cement ratios (W/C), and the role of aggregates on the other hand on the drying kinetics of cement ... [more ▼]

This work reports the results of an experimental study concerning on one hand the influence of water-to cement ratios (W/C), and the role of aggregates on the other hand on the drying kinetics of cement pastes during thermal drying. Three types of cement pastes were realized and studied; cement pastes with ratios W/C 0.4, W/C 0.5 and mortar with ratio W/C 0.5. These tries present the advantage to reproduce the natural conditions met in the problems of interaction atmosphere and material. Cylindrical samples of cement of size (17 X 13) mm are dried in a convective dryer. The sample is continuously weighed during the drying test and its mass is recorded every 60 s, in the purpose to obtain the drying curves. The results show that the increase of the W/C ratio leads to an increase of the drying rate due to the increase of the initial porosity. The effect of the introduction of aggregates is observable by the comparison of the drying curve obtained for the mortar and the cement pastes. The results show a decrease of the drying kinetics with mortars. The results also show that the air drying temperature has a large impact on the drying process, increasing the temperature leading to significant drying time reduction. The Effective diffusion coefficient is calculated by comparison between the experimental results and the analytical solution of Fick’s equation written for a finite medium. [less ▲]

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See detailExperimental Study of the Human Ability to Deliberately Excite a Flexible Floor
Schwartz, Cédric ULg; Berger, Alexis; Bruls, Olivier ULg et al

in Zingoni, Alphose (Ed.) Proceedings of the 5th International Conference on Structural Engineering, Mechanics and Computation (2014)

Human-structure interactions are not completely understood yet. This paper presents an experimental study focusing on the interaction between a human and a flexible support, with a major aim to better ... [more ▼]

Human-structure interactions are not completely understood yet. This paper presents an experimental study focusing on the interaction between a human and a flexible support, with a major aim to better understand how the behavior of a human subject, bouncing on a flexible structure, adapts to the support motion. Exploratory experiments are undertaken with a 7m-span timber footbridge tested in the Human Motion Analysis Laboratory of the University of Liege. The movements of the coupled system composed of the subject and the footbridge are recorded by Motion Capture technology; the subject\textquoteright{}s 3-D body motion is defined by three important angles: ankle, knee and hip. The interaction between the subject and the footbridge is also quantified by means of force platform measurements. The experiments indicate an influence of the support amplitude and natural frequency on the phase shift between the oscillatory floor motion and the three angles characterizing the motion. [less ▲]

Detailed reference viewed: 9 (1 ULg)
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See detailExperimental study of the hydraulic behavior of piano key weirs
Machiels, Olivier ULg; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

in Proc. 17th Congress of the Asia and Pacific Division of the International Association of Hydro-Environment Engineering and Research (2010)

Detailed reference viewed: 43 (4 ULg)
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See detailExperimental study of the hydraulic behaviour of Piano Key Weirs
Machiels, Olivier ULg

Doctoral thesis (2012)

Detailed reference viewed: 76 (26 ULg)
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See detailExperimental Study of the Integration of a Scroll Expander into a Heat Recovery Rankine Cycle
Lemort, Vincent ULg; Teodorese, Ion

(2006, July)

This study investigates the possibility to associate a scroll expander to a heat recovery Rankine cycle, working with water. In view to develop such a scroll expander, three scroll compressors are adapted ... [more ▼]

This study investigates the possibility to associate a scroll expander to a heat recovery Rankine cycle, working with water. In view to develop such a scroll expander, three scroll compressors are adapted to be run in expander mode. The three tested expanders are fed with water steam and air. Two of them need to be lubricated. The third expander is also fed with a binary mixture of water and propylene glycol. A model of scroll expander is proposed and validated. [less ▲]

Detailed reference viewed: 109 (4 ULg)
Peer Reviewed
See detailExperimental study of the interaction between a turbulent flow and a river biofilm growing on macrorugosities
Moulin, F. Y.; Peltier, Yann ULg; Bercovitz, Y. et al

in International Conference in Hydroscience and Engineering 2008 (2008)

Detailed reference viewed: 6 (0 ULg)
Peer Reviewed
See detailExperimental study of the non-linear behaviour of beam-to-column bolted joints.
Janss, J.; Jaspart, Jean-Pierre ULg; Maquoi, René ULg

in Proceedings of a State-of-the art workshop on connections and the behaviour, strength and design of steel structures. (1988, February)

Detailed reference viewed: 66 (0 ULg)
Peer Reviewed
See detailExperimental study of the non-linear behaviour of beam-to-column composite joints
Altmann, R.; Maquoi, René ULg; Jaspart, Jean-Pierre ULg

in Journal of Constructional Steel Research (1991), 18

Detailed reference viewed: 14 (0 ULg)