Browsing by Author "Boukhari, 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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    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.