References of "Belhamri, Azeddine"
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See detailMEASUREMENT OF MOISTURE DIFFUSIVITY BY INVESTIGATION OF SORPTION ISOTHERM AND MODELING MOISTURE TRANSFER OF MORTAR SUBMITED TO CONVECTIVE DRYING
Kahlerras, Loubna ULg; BELHAMRI, Azeddine; Fraikin, Laurent ULg et al

in Proceedings of The 20th International Drying Symposium (IDS 2016) (2016, August 08)

This work reports the results of experimental study concerning convective drying of cement mortar and the influence of water-to cement ratios (W/C) used for the preparation of mortar, on moisture changes ... [more ▼]

This work reports the results of experimental study concerning convective drying of cement mortar and the influence of water-to cement ratios (W/C) used for the preparation of mortar, on moisture changes. The first experimental campaign was a convective dryer; in the purpose to obtain the drying curves of mortar and the influence of water to cement ratios (W/C) on drying kinetics. A second experimental campaign aims to characterize from textural and hydric point of view, the materials, by mean of DVS (dynamic vapor sorption) In order to obtain sorption cycles and identify the moisture diffusivity coefficient of mortar. The pore size distribution is obtained from sorption cycles and completed by MIP. The contribution of each components of the microstructure to the diffusion is studied. Finally X-ray microtomography is used to measuring the moisture content in the internal structure of mortars during drying. [less ▲]

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See detailETUDE DE LA MICROSTRUCTURE DU MORTIER DE CIMENT A TRAVERS LES COURBES DE SORPTION
Kahlerras, Loubna ULg; Belhamri, Azeddine; Fraikin, Laurent ULg et al

in kahlerras, loubna (Ed.) Proceedings du séminaire International sur le Génie Climatique et l’Energétique, SIGCLE’2015 (2015, November 09)

La présente étude se focalise sur l’étude à travers les courbes de sorption de vapeur d’eau du comportement hydrique du mortier de ciment. Les expériences sont effectuées sur trois types de mortiers dont ... [more ▼]

La présente étude se focalise sur l’étude à travers les courbes de sorption de vapeur d’eau du comportement hydrique du mortier de ciment. Les expériences sont effectuées sur trois types de mortiers dont la seule différence est dans le rapport eau/ciment (E/C = 0,4, 0,5 et 0,6) afin d’étudier l’influence de ce rapport sur la microstructure du matériau. La méthode dynamique est utilisée pour l’obtention des isothermes de sorption en utilisant le « DVS (dynamic vapour sorption) Des échantillons en forme de concassât de quelques millimètres de diamètre sont utilisés, l’étude est complété par la porosité à mercure. Deux principaux modes poreux sont déterminés. [less ▲]

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See detailmodelling heat and mass transfer during convective drying of a building material
Kahlerras, Loubna ULg; Belhamri, Azeddine; Fraikin, Laurent ULg et al

Poster (2014, August 24)

The purpose of this study is to characterize experimentally the behaviour of a cement mortar during its convective drying. The work presented here focuses on mortars with water-to cement ratios (w/C) of 0 ... [more ▼]

The purpose of this study is to characterize experimentally the behaviour of a cement mortar during its convective drying. The work presented here focuses on mortars with water-to cement ratios (w/C) of 0, 5. The drying tests are realized in a convective dryer designed for the drying of small samples (0 - 8g). Experiences are realized with different conditions of drying air temperature (60, 90 and 130 °C) and velocity (2, 3 and 5 m/s) the results show the influence of temperature and velocity on drying curve. Mathematical models have been used for the description of drying curves. The exponential mathematical model seems the most adequate to describe the drying curves of cement mortars, with correlation coefficients changing with the air temperature and velocity and close to unity. The convective mass and heat transfer coefficients are determined from the experimental data. The results showed that both mass and heat transfer coefficients were affected by the air temperature and velocity. The convective mass transfer coefficient changed from 0.0232m/s at V=2m/s to 0.045m/s at V=5m/s, and from 0.055 m/s at 60°c to 0.023 at 130°c. Heat transfer coefficient changed from 14.767 w/m2°c at V=2m/s to 28.64 w/m2°c at V=5m/s and from 7.71 at 60° c to 14.77 at 130°c The temperature dependency of the two coefficients was expressed using an Arrhenius-type equation and related parameters were deduced [less ▲]

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See detailExperimental study of the drying kinetic of mortar
Kahlerras, Loubna ULg; Michel, Frédéric ULg; Courard, Luc ULg et al

Poster (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 detailDetermination of Moisture Diffusivity During Drying of Mortar Cement: Experimental and Modeling Study
Bennamoun, Lyes ULg; Kahlerras, Loubna ULg; Michel, Frédéric ULg et al

in International Journal of Energy Engineering (2013), 3(1), 1-6

The aim of this study is the experimental characterization of the behaviour of a mortar during convective drying. We focalise on mortar that has a rate water-cement of 0.5. The drying tests are developed ... [more ▼]

The aim of this study is the experimental characterization of the behaviour of a mortar during convective drying. We focalise on mortar that has a rate water-cement of 0.5. The drying tests are developed in a micro-convective dryer that can use samples weighing from 0 to 8g. The advantage of these experiments is to reproduce the natural conditions that can be found during the treatment of the mortar-atmosphere problems. The response of the drying curve or the drying kinetic depends on the applied drying conditions. So, the temperature of the air varies from 60°C to 130°C, the velocity of the air is changed from 2 m.s-1 to 5 m. s-1and the relative humidity is kept less than 1.7%. The comparison between the experimental results and the proposed analytical solutions of the equation of diffusion represented by Fick’s law, applied for a finite shape, allows determination of the values of the diffusion coefficient. It has a value of 1.71×10-10 m2.s-1 at 60°C, 13.69×10-10 m2.s-1 at 90°C and 16.27×10-10 m2.s-1 at 130°C. Calculation of the activation energy and the D0 constant are also possible. [less ▲]

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See detailETUDE DE L’EVOLUTION DES COEFFICIENTS DE TRANSFERT DE SURFACE LORS DU SECHAGE D’UN MILIEU POREUX HUMIDE
Kahlerras, Loubna ULg; Belhamri, Azeddine

in Proceedings du 1er Séminaire International sur le Génie Climatique et l’Energétique, SIGCLE’2010 (2010, December 06)

Ce travail se propose d’analyser les phénomènes du séchage convectif d’un milieu poreux non saturé. Le modèle de calcul considère le couplage des équations de la couche limite et celles qui décrivent le ... [more ▼]

Ce travail se propose d’analyser les phénomènes du séchage convectif d’un milieu poreux non saturé. Le modèle de calcul considère le couplage des équations de la couche limite et celles qui décrivent le transfert de chaleur et de masse dans un milieu poreux, ayant les caractéristiques du béton renforcé avec des coupeaux de bois. La simulation effectuée montre l’effet de certains paramètres pertinents du matériau comme la température initiale et l’humidité initiale, sur le processus du séchage. [less ▲]

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See detailInfluence Des Conditions Extérieures Sur Le Comportement Au Séchage d'un Milieu Poreux
Kahlerras, Loubna ULg; Belhamri, Azeddine

Poster (2010, May 07)

Ce travail se propose d’analyser les phénomènes du séchage convectif d’un milieu poreux non saturé. Le modèle de calcul considère le couplage des équations de la couche limite et celles qui décrivent le ... [more ▼]

Ce travail se propose d’analyser les phénomènes du séchage convectif d’un milieu poreux non saturé. Le modèle de calcul considère le couplage des équations de la couche limite et celles qui décrivent le transfert de chaleur et de masse dans un milieu poreux, ayant les caractéristiques du béton renforcé avec des coupeaux de bois. La simulation effectuée montre l’effet de certains paramètres pertinents du matériau comme la température initiale et l’humidité initiale, sur le processus du séchage [less ▲]

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See detailApplication of a diffusion model to predict drying kinetics changes under variable conditions: experimental and simulation study
Bennamoun, Lyes ULg; Belhamri, Azeddine; Ali-Mohamed, Adbéraman

in Fluid Dynamics and Materials Processing (2009), 5(2),

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See detailAnalyse des transferts couplés de chaleur et de masse pendant le séchage des figues
Khama, Réda; Belhamri, Azeddine; Bennamoun, Lyes ULg

in Revue Algérienne de Physique (2009)

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See detailMathematical description of heat and mass transfer during deep-bed drying: effect of product shrinkage on bed porosity
Bennamoun, Lyes ULg; belhamri, Azeddine

in Applied Thermal Engineering (2008), 18(17-18), 2236-2244

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See detailStudy of heat and mass transfer in porous media: application to packed-bed drying
Bennamoun, Lyes ULg; Belhamri, Azeddine

in Fluid Dynamics and Materials Processing (2008), 4(4), 221-230

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See detailÉtude d’un séchoir solaire fonctionnant en mode direct et indirect
Chalal, Nadia; belhamri, Azeddine; Bennamoun, Lyes ULg

in Revue des Energies Renouvelables (2008)

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See detailContribution à l’étude de faisabilité de séchoirs solaires pour les produits agricoles
Bennamoun, Lyes ULg; Belhamri, Azeddine

in Revue des Energies Renouvelables (2007)

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See detailNumerical simulation of drying under variable external conditions: application to solar drying of seedless grapes
Bennamoun, Lyes ULg; Belhamri, Azeddine

in Journal of Food Engineering (2006), 76(2), 179-187

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See detailDesign and simulation of a solar dryer for agriculture products
Bennamoun, Lyes ULg; Belhamri, Azeddine

in Journal of Food Engineering (2003), 59(2-3),

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