Vol 19, No 4 (2017) Ahead of Print by Naoual Bekkioui
Parameters characterizing wood and air were studied in order to analyze the performance of a wood... more Parameters characterizing wood and air were studied in order to analyze the performance of a wood solar dryer functioning under Moroccan climate. A mathematical model based on the climate data of Rabat city was used to investigate theoretically the wood drying process. Two wood species—thuya (Tetraclinis articulate) and pine (Pinus pinaster)—were examined in the present study. The results obtained by computer simulations are in good agreement with the experimental values. Furthermore, our findings indicate that the use of a global mass transfer coefficient for low temperature convective and homogenous drying conditions allows the influence of the principal operating parameters (wood thickness, wood density, air temperature, air velocity and ventilation mode) on the drying time to be estimated with great accuracy. Analyses pertaining to the two studied wood species revealed that(1) pine dries more quickly than thuya, (2) the drying process is faster in the summer relative to other seasons, (3) increasing the air velocity by 100% results in a 20% reduction in the drying time, and (4)continued ventilation reduces the drying time by 43%.
Bookmarks Related papers MentionsView impact
Papers by Naoual Bekkioui
E3S web of conferences, Dec 31, 2022
Bookmarks Related papers MentionsView impact
Bulletin of Materials Science, Jun 21, 2023
Bookmarks Related papers MentionsView impact
Computational Condensed Matter, Mar 1, 2020
Bookmarks Related papers MentionsView impact
Optik
Bookmarks Related papers MentionsView impact
International Journal of Ambient Energy
Bookmarks Related papers MentionsView impact
Computational Condensed Matter
Bookmarks Related papers MentionsView impact
Solid State Communications, 2017
Bookmarks Related papers MentionsView impact
Wood Material Science & Engineering
Bookmarks Related papers MentionsView impact
Chemical Physics Letters
Bookmarks Related papers MentionsView impact
This work presents verification of a mathematical model for drying of a wood stack in a greenhous... more This work presents verification of a mathematical model for drying of a wood stack in a greenhousetype solar dryer. A simplified heat and mass transfer numerical model has been developed with inputparameters based on the actual metrological data of a Moroccan climate. For its validation, a comparativestudy is performed in this work; the present model is solved to simulate the solar drying of pine woodusing experimental data of previous wood drying experiments. The average relative discrepanciesbetween the model predicted and experimental data are 1,2% for wood moisture content, 1% for dryingair temperature and 5% for the air relative humidity. The close agreement between the predicted andexperimental results shows the ability of the model to reproduce experimental drying data for wood
Bookmarks Related papers MentionsView impact
Renewable Energy
Bookmarks Related papers MentionsView impact
Drying Technology
Bookmarks Related papers MentionsView impact
Journal of Superconductivity and Novel Magnetism, 2021
In this work, a theoretical investigation on the effect of Fe on the structural and electronic pr... more In this work, a theoretical investigation on the effect of Fe on the structural and electronic properties of bulk LiNbO3 perovskite with different concentrations (x = 8.33% and 16.66%) was developed using density functional theory (DFT) within Wien2k package. The results indicated that LiNbO3 exhibits a non-magnetic semiconductor characteristic with an indirect band gap, which is in good agreement with experimental data reported in pertinent literature. The concentration of 8.33% of Fe did not modify the semiconductor behavior of the studied perovskite. However, a remarkable reduction in the band gap energy was found compared to the pure LiNbO3 material. Furthermore, a concentration of about 16.66% of Fe in LiNbO3 material showed an outstanding change of the electronic behavior from a semiconductor character of pure LiNbO3 to a half-metallic behavior. The results yielded by this study prove the possibility to use LiNbO3 for other technological applications, such as spintronics. This can pave the way to further investigations and research of this kind of materials.
Bookmarks Related papers MentionsView impact
International Journal of Energy and Environmental Engineering
Bookmarks Related papers MentionsView impact
Solar Energy
Bookmarks Related papers MentionsView impact
Maderas. Ciencia y tecnología, 2017
Bookmarks Related papers MentionsView impact
Chemical Physics
Bookmarks Related papers MentionsView impact
2016 International Renewable and Sustainable Energy Conference (IRSEC), 2016
The main of this work is to analyze the performance of a wood solar dryer functioning under a Mor... more The main of this work is to analyze the performance of a wood solar dryer functioning under a Moroccan climate. A mathematical model based on actual climate data of Rabat city is used to investigate theoretically the drying wood process. The influence of the principal operating parameters (wood thickness, wood density, air temperature and air velocity) on the drying time is studied. The results obtained show an acceptable agreement between computed and experimental values.
Bookmarks Related papers MentionsView impact
Chemical Physics
Abstract In this study, the effects of Sulfur (S), Selenium (Se), and Tellurium (Te) on the elect... more Abstract In this study, the effects of Sulfur (S), Selenium (Se), and Tellurium (Te) on the electronic and optical properties of LiNbO3 were studied by using density functional theory (DFT) within Wien2k code based on the generalized gradient approximation (GGA-PBE). Analyses of the studied components revealed that the incorporation of chalcogens in LiNbO3 effectively reduces the electronic band-gap and that varying the amount and the type of dopant can control the level of band-gap reduction. The band-gap is equal to 2.312 eV, 1.996 eV, and 0.924 eV for 11.11% S, Se, and Te doped LiNbO3, respectively. For the pure LiNbO3, the band-gap is 3.544 eV. Moreover, the absorption is improved in the visible light (380–790 nm) and exceeds 105 cm−1 for Te doped-LiNbO3. The dielectric constant at zero frequency (e1(0)) is equal to 5.254 for LiNbO3 and 8.531 for Te doped-LiNbO3: 11.11%. Optical conductivity and reflectivity are predicted and the results showed that increasing chalcogens concentration considerably improves the electrical conductivity. Comparisons between the three types of doping were also performed and the results indicated that Te would be the best substitute for oxygen in LiNbO3; hence ensuring a promising and environmentally friendly new class of solar cells.
Bookmarks Related papers MentionsView impact
Uploads
Vol 19, No 4 (2017) Ahead of Print by Naoual Bekkioui
Papers by Naoual Bekkioui