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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 ▲]

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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 ▲]

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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)

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See detailExperimental study of the hydraulic behaviour of Piano Key Weirs
Machiels, Olivier ULg

Doctoral thesis (2012)

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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 ▲]

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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)

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See detailExperimental study of the magnetic shielding performances of a Bi2223 tube closed by a Bi2223 cap.
Wera, Laurent ULg; Fagnard, Jean-François ULg; Hogan, Kevin ULg et al

Poster (2014, August 12)

A superconducting tube can be used as an efficient magnetic shield. However, the shielding factor (defined as the ratio between the applied magnetic induction and the magnetic induction measured inside ... [more ▼]

A superconducting tube can be used as an efficient magnetic shield. However, the shielding factor (defined as the ratio between the applied magnetic induction and the magnetic induction measured inside the tube) decreases towards tube extremities because of the field penetration through the open ends of the tube. To improve the performances at tube extremities, the tube should be closed. This can be achieved by using a superconducting vessel or by closing both extremities with a cap. The purpose of the present work is to study experimentally the shielding performances of a Bi2223 tube closed by a superconducting Bi2223 cap. The cap is a circular plate with a diameter equal to the outer diameter of the tube and there is no superconducting joint between the cap and the tube. Our interest is to characterize the effect of the cap on the shielding factor distribution along the tube axis when only one extremity of the tube is closed. We also study the effect of the gap size between the cap and the tube in axial configuration. Finally, a tube closed at its both ends is also characterized. All experiments are carried out at 77K. The tube is subjected to a quasi-static (“DC”) uniform magnetic field. A Hall probe measures the three components of the local magnetic induction along the axis of the tube as a function of the applied magnetic induction. Results show that the shielding performances in the axial configuration are highly improved at the closed extremity as the cap reduces the penetration through the open end. The shielding factor distribution along the tube axis is affected by the presence of the cap. For an open tube, the shielding factor is maximum near the center and decreases towards both extremities. For the tube closed at one extremity, the shielding factor is maximum at the closed extremity and decreases towards the center. Moreover, the shielding factor distribution between the tube center and the open extremity is not affected by the presence of the cap. The experimental results show that, a small gap between the tube and the cap, which can be necessary for applications, does not strongly affect the magnetic shielding performances of the assembly. [less ▲]

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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)

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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

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See detailExperimental study of the non-linear behaviour of beam-to-column composite joints.
Altmann, R.; Maquoi, René ULg; Jaspart, Jean-Pierre ULg

in proceeding du Workshop COST C1 (1992)

Detailed reference viewed: 18 (2 ULg)
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See detailExperimental study of the non-linear behaviour of beam-to-column composite joints.
Altmann, R.; Maquoi, René ULg; Jaspart, Jean-Pierre ULg

in Proceedings of the International colloquium on stability of steel structures (1990)

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See detailExperimental study of the thermo-hydraulic performances of air-cooled radiators
Ngendakumana, Philippe ULg; Trebilcock, Felipe

Report (2004)

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See detailExperimental study of the thermo-hydraulic performances of humid air condensers
Cuevas, Cristian; Trebilcock, Felipe; Ngendakumana, Philippe ULg

Report (2003)

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See detailAn experimental study of the use of acoustic diffusers to reduce noise in urban areas
Picaut, Judicaël; Hossam Eldien, Hany; Billon, Alexis ULg

Conference (2010, June)

The use of acoustic diffusers to reduce noise in urban areas has been recently numerically investigated [Acta Acustica united with Acustica, Vol. 95 (2009), p. 653–668]. It was shown that a significant ... [more ▼]

The use of acoustic diffusers to reduce noise in urban areas has been recently numerically investigated [Acta Acustica united with Acustica, Vol. 95 (2009), p. 653–668]. It was shown that a significant noise reduction can be observed by considering diffusers on the building façades. In the present study, an experimental investigation is proposed to validate last results. Measurements are carried out using a 1:10 urban street scale model, with and without acoustics diffusers, in order to evaluate the “real” effect of such devices, for several configurations. Results, in terms of sound attenuation and reverberation, show that a positive effect can be observed, provided that diffusers are well designed for the reduction of road traffic noise. [less ▲]

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See detailExperimental study of velocity fields in rectangular shallow reservoirs
Dewals, Benjamin ULg; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

in Journal of Hydraulic Research (2012), 50(4), 435-436

The Authors of the discussed paper present the results of an experimental study to improve the flow classification in rectangular shallow reservoirs. Although previous papers have paved the way for this ... [more ▼]

The Authors of the discussed paper present the results of an experimental study to improve the flow classification in rectangular shallow reservoirs. Although previous papers have paved the way for this classification (Dewals et al. 2008, Dufresne et al. 2010), the Authors are complemented for the detailed flow field measurements conducted for a high number of reservoir geometries. For the tested hydraulic conditions, the Authors report a transition zone corresponding to an ‘unstable’ flow pattern. Repeated tests under similar conditions lead alternately to a symmetric or an asymmetric flow field. In this discussion, it is intended below to shed light on this transition zone using 2D numerical simulations. The Authors state that the flow in the transition zone is sensitive to so-called ‘external perturbations’, whereas we argue that the flow is particularly influenced by the initial test conditions. Using a particular post-processing of the computed flow fields, a hysteresis effect is detected. [less ▲]

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See detailExperimental study of wings undergoing active root flapping and pitching
Abdul Razak, Norizham; Dimitriadis, Grigorios ULg

in Journal of Fluids & Structures (2014), 49

This paper presents the results of experiments carried out on mechanical wings undergoing active root flapping and pitching in the wind tunnel. The objective of the work is to investigate the effect of ... [more ▼]

This paper presents the results of experiments carried out on mechanical wings undergoing active root flapping and pitching in the wind tunnel. The objective of the work is to investigate the effect of the pitch angle oscillations and wing profile on the aerodynamic forces generated by the wings. The experiments were repeated for different reduced frequency, airspeed, flapping and pitching kinematics, geometric angle of attack and wing sections (one symmetric and two cambered airfoils). A specially designed mechanical flapper was used, modelled on large migrating birds. It is shown that, under pitch leading conditions, good thrust generation can be obtained at a wide range of Strouhal numbers if the pitch angle oscillation is adjusted accordingly. Consequently, high thrust was measured at both the lowest and the highest tested Strouhal numbers. Furthermore, the work demonstrates that the aerodynamic forces can be sensitive to the Reynolds number, depending on the camber of the wings. Under pitch lagging conditions, where the effective angle of attack amplitude is highest, the symmetric wing was affected by the Reynolds number, generating less thrust at the lowest tested Reynolds value. In contrast, under pure flapping conditions, where the effective angle of attack amplitude was lower but still significant, it was the cambered wings that demonstrated Reynolds sensitivity. [less ▲]

Detailed reference viewed: 37 (2 ULg)