Browsing by Author "ASKRI, S."

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    EFFECT OF DENSITY AND TEMPERATURE PROFILE OF He GAS IN INTERFEROMETER METHOD USING LASER He-Ne
    (University of Eloued جامعة الوادي, 2018-02-05) ASKRI, S.; Lemerini, M.; Ferouani, A. K.
    This work presents an optical diagnosis using interferometer method (Fig.1) using laser He-Ne. The density and the temperature are visualized by studying the interferograms of He (helium) gas medium subjected to a stationary DC (Corona Discharge) at atmospheric pressure [1-2]. The density is extracted from the phase shifting introduced by the studied medium, and the temperature is deduced from the ideal gas law. The refractive index is related to the density through the Gladstone–Dale equation [3]. The experimental set up that we have applied here is assumed to be cylindrically symmetric and the distance between electrodes, equals 10 mm. The obtained results show that the rate variation of the density increase from 10 to 45% and the temperature is varying between 300 to 500 K in all the space.
  • Thumbnail Image
    Item
    NUMERICAL ANALYSIS OF NOX REMOVAL IN POLLUTED AT ATMOSPHERIC PRESSURE AND AMBIENT TEMPERATURE
    (2018-05-02) ASKRI, S.; FEROUANI, A. K.; LEMERINI, M.; OUGHERB, C.
    The aim of this work is to analyse the time evolution of the NOx species involved in a corona discharge used for NO pollution control in polluted air at atmospheric pressure and ambient temperature. The model takesin to account 20 chemical species (electrons, molecules N2, O2, H2O, CO2, OH, HNO3, CO, O3, atoms N, O, H, nitric oxides NO, NO2, NO3, N2O5, negative ions (O−,O−2,O−3) and metastable specie N(2D), in the mixture of a specific flue gas (N2: 76%, O2: 6%, H2O: 6% and CO2: 12%, and a few ppm of NO). These chemical species react following 100 selected chemical reactions. The density is analyzed by the continuity equation without diffusion term. We analyze the time evolution (10−9-10−3 s) of the density and the rate coefficient of certain reactions, under different reduced electric fields in the range of 50-300 Td .The obtained results show the contribution of N, O, OH radicals and N(2D) in reduction of NO and NO2. So, the NO removal efficiency reached 90% under 300 Td.