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Universitatea Ovidius Constanta
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HAL (Le Centre pour la Communication Scientifique Directe), 2018
HAL (Le Centre pour la Communication Scientifique Directe), Nov 19, 2018
International Journal for Simulation and Multidisciplinary Design Optimization, 2014
This present study is the numerical estimation of the temperature distribution and the water cont... more This present study is the numerical estimation of the temperature distribution and the water content distribution underground soil under the Mediterranean climate type. We use as input data of ambient temperature, air humidity and solar radiation, average values during 10 years estimated from data supplied by the local meteorological station (Tizi-Ouzou, Northern Algeria, 36°47′59″, North latitude and 4°1′59″, East longitude). A theoretical model, based on heat and water transfer equations, was established for an unsaturated soil submitted to the climatic conditions of this site. The mathematical model established in mono dimensional type, for a semi infinite transfer model, is based on Whitaker theory of heat and mass transfers in unsaturated porous medium (Withaker 1977, 1980) with the hypothesis that air pressure into soil porosity is equal to atmospheric pressure. The equations were discretized according to the finite volume method, which is more adapted for this type of problem...
Computational Thermal Sciences: An International Journal, 2017
The non-Boussinesq convection in a ventilated square cavity is studied numerically. The flow is d... more The non-Boussinesq convection in a ventilated square cavity is studied numerically. The flow is driven by a prescribed constant inlet velocity at the top-left wall and an outlet located at the bottom-right wall. The prescribed temperature difference, between the inlet flow and the walls of the cavity, involves buoyancy forces which modify the flow. The density variations are considered by means of a low-Mach-number formulation, which is discretized by a projection scheme based on a second-order finitedifference discretization. The steady solutions associated to forced and mixed convection are presented. A discussion based on the flow and heat transfer features is proposed. Especially, the deviation from the Boussinesq model is highlighted in the case of mixed convection.
Stearic acid/coffee grounds composites with graphite as thermal energy storage materials were pre... more Stearic acid/coffee grounds composites with graphite as thermal energy storage materials were prepared using impregnation methods. In the composites, coffee grounds acted as the supporting material, and stearic acid is selected as the phase change material (PCM) due to the desirable thermal properties to the thermal storage by latent heat. Nevertheless, it has a major disadvantage of the low thermal conductivity. In order to improve conduction heat property of the composites, graphite was added in the composites. Fourier transformation infrared spectroscope (FT-IR), and scanning electronic microscope (SEM) were used to determine chemical structure, microstructure of stearic acid/coffee grounds composites, respectively. The thermal properties, such as phase change temperature and latent heat, were investigated by a differential scanning calorimeter (DSC). Thermal conductivity was determined by a Hot disk Method. The SEM results showed that stearic acid was well dispersed in the porou...
Etude theorique du sechoir electro-solaire installe a la cooperative de corneilla de conflent. Ce... more Etude theorique du sechoir electro-solaire installe a la cooperative de corneilla de conflent. Ce modele est utilise, pour determiner le mode de fonctionnement, temperature de consigne et debit d'air assechant, optimal du point de vue energetique dans le cas particulier du sechage de la pomme. Une etude economique qui, en integrant les perfomances purement techniques du systeme, permet de repondre quant a la faisabilite financiere d'un tel systeme.
HAL (Le Centre pour la Communication Scientifique Directe), 2018
HAL (Le Centre pour la Communication Scientifique Directe), Nov 19, 2018
International Journal for Simulation and Multidisciplinary Design Optimization, 2014
This present study is the numerical estimation of the temperature distribution and the water cont... more This present study is the numerical estimation of the temperature distribution and the water content distribution underground soil under the Mediterranean climate type. We use as input data of ambient temperature, air humidity and solar radiation, average values during 10 years estimated from data supplied by the local meteorological station (Tizi-Ouzou, Northern Algeria, 36°47′59″, North latitude and 4°1′59″, East longitude). A theoretical model, based on heat and water transfer equations, was established for an unsaturated soil submitted to the climatic conditions of this site. The mathematical model established in mono dimensional type, for a semi infinite transfer model, is based on Whitaker theory of heat and mass transfers in unsaturated porous medium (Withaker 1977, 1980) with the hypothesis that air pressure into soil porosity is equal to atmospheric pressure. The equations were discretized according to the finite volume method, which is more adapted for this type of problem...
Computational Thermal Sciences: An International Journal, 2017
The non-Boussinesq convection in a ventilated square cavity is studied numerically. The flow is d... more The non-Boussinesq convection in a ventilated square cavity is studied numerically. The flow is driven by a prescribed constant inlet velocity at the top-left wall and an outlet located at the bottom-right wall. The prescribed temperature difference, between the inlet flow and the walls of the cavity, involves buoyancy forces which modify the flow. The density variations are considered by means of a low-Mach-number formulation, which is discretized by a projection scheme based on a second-order finitedifference discretization. The steady solutions associated to forced and mixed convection are presented. A discussion based on the flow and heat transfer features is proposed. Especially, the deviation from the Boussinesq model is highlighted in the case of mixed convection.
Stearic acid/coffee grounds composites with graphite as thermal energy storage materials were pre... more Stearic acid/coffee grounds composites with graphite as thermal energy storage materials were prepared using impregnation methods. In the composites, coffee grounds acted as the supporting material, and stearic acid is selected as the phase change material (PCM) due to the desirable thermal properties to the thermal storage by latent heat. Nevertheless, it has a major disadvantage of the low thermal conductivity. In order to improve conduction heat property of the composites, graphite was added in the composites. Fourier transformation infrared spectroscope (FT-IR), and scanning electronic microscope (SEM) were used to determine chemical structure, microstructure of stearic acid/coffee grounds composites, respectively. The thermal properties, such as phase change temperature and latent heat, were investigated by a differential scanning calorimeter (DSC). Thermal conductivity was determined by a Hot disk Method. The SEM results showed that stearic acid was well dispersed in the porou...
Etude theorique du sechoir electro-solaire installe a la cooperative de corneilla de conflent. Ce... more Etude theorique du sechoir electro-solaire installe a la cooperative de corneilla de conflent. Ce modele est utilise, pour determiner le mode de fonctionnement, temperature de consigne et debit d'air assechant, optimal du point de vue energetique dans le cas particulier du sechage de la pomme. Une etude economique qui, en integrant les perfomances purement techniques du systeme, permet de repondre quant a la faisabilite financiere d'un tel systeme.