Browsing by Author "Khechekhouche, A"

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    CONVECTION HEAT TRANSFER AND MAGNETOHYDRODYNAMICS STABILITYOF SWIRLING FLOWS IN CYLINDRICAL CONTAINER
    (جامعة الوادي - university of el oued, 2014) Boukhari, A; Khechekhouche, A; Bessaih, R
    In the present work, a study of the mixed convection flow of low Prandtl number fluid ( Pr  0.015 ) confined in a cylindrical container having an aspect ratio equal to 2, with and without magnetic fields, has been considered. The finite volumes method has been used to resolve the equations of continuity, momentum (or Navier-Stokes), energy and electric potential. In the absence of magnetic field, the numerical results obtained show the appearance of oscillatory instabilities for the values of the critical Reynolds number Re  2575,924,802, cr and606 , corresponding respectively to the values of the Richardson number Ri  0, 0.5, 1.0 and 2.0. However, in the presence of the vertical magnetic field, the fluid continues its stable flow until the values of Reynolds number greater than those predictable to have oscillatory instabilities. Stability diagrams have been established according to the numerical results of this investigation. These diagrams put in evidence the dependence of the critical Reynolds number and critical frequency of oscillations with the increase of the Hartmann number for various values of the Richardson number. In conclusion, the stabilizing technique of the mixed convection flows of fluids having low Prandtl number (semiconductors) by the application of an external magnetic field is practically reliable.
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    Effect of plastic fins on a traditional solar still's efficiency
    (جامعة الوادي - university of el oued, 2022-05-27) Khechekhouche, A; de Oliveira Siqueira, A.M; Nabi, Elsharif
    Solar distillation is a relatively straightforward and environmental method. It is used in many countries and especially in isolated areas to treat polluted water. In this context, two similar solar stills of 50 x 50 cm were used in the same climatic conditions in order to test the influence of plastic fins on the performance of this device. The results show that there is a negative effect on the output of the distiller with a rate of 8.8 %. So this way is not recommended for researchers in this field
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    GPVDM simulation of layer thickness effect on power conversion efficiency of CH3NH3PbI3 based planar heterojunction solar cell
    (جامعة الوادي - university of el oued, 2018-06-25) Hima, A; Khechekhouche, A; Kemerchou, I; Lakhdar, N; Benhaoua, B; Rogti, F; Telli, I; Saadoun, A
    Perovskite-based solar cell technologies have been a very attractive area of research in recent years. Organic-inorganic perovskite materials are in an increased evolution in power conversion efficiency. Inorganic materials have been tested at the laboratory level but their power conversion efficiency is still limited. In this paper, we used the GPVDM software to study the effect of some parameters on power conversion efficiency in a planar heterojunction solar cell based on CH3NH3PbI3 as an absorbing layer. The modifications were made by considering layers of perovskite without defects. The results show that the efficiency of the power conversion can be improved by adjusting layer thickness; in our case power conversion efficiency was increased from 9.96 % to 12.9 %.
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    MODÉLISATION ET RÉSOLUTION NUMÉRIQUE DE L'ÉQUATION DE POISSON EN 2D PAR LA MÉTHODE DE DIFFÉRENCE FINIE CAS DE L'ÉQUATION DU TRANSFERT DE LA CHALEUR
    (جامعة الوادي - university of el oued, 2012) Benhissen, N; Khechekhouche, A
    The objective of this work is to solve the Poisson equation by the finite difference method is therefore to provide an approximate solution of the actual behavior of a physical phenomenon. Such as the equation of heat transfer. We will take as a model of square/rectangular plate, with different boundary conditions and we will specify also the values boundaries (the Dirichlet condition). The analysis is based on the simulation results based on certain criteria and choice of parameters that comes into play in the equation, this will give us a good understanding of the manipulation of these parameters and thus understand what is happening on environment studied
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    Seasonal effect on solar distillation in the El-Oued region of south-east Algeria
    (Seasonal effect on solar distillation in the El-Oued region of south-east Algeria, 2017-07-27) Khechekhouche, A; Boukhari, A; Driss, Z; Benhissen, N
    In the present purely experimental work, we tested a solar distiller with a simple slope in the region of El-Oued located in the south-east of Algeria, during the winter then the summer seasons at the same place. Dimensions of the studied device are 1000 x 500 mm, while the depth of the water to be distilled is 1 cm, the glazing thickness is 4 mm, and the tilt angle with respect to the horizontal is 10 °.The aim of this work is to compare distillation between winter (January) and summer (May) to show that weather factors such as solar radiation, ambient temperature and humidity are influential on the distiller productivity. The amount of distilled water in winter was about 119 ml per day. However, that in summer was 1127 ml per day in total, so it is an increase of more than 9 times the production of distilled water.