Publications Scientifiques

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Author: search.filters.author.Daimallah, AhmedHas files: No

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    Corrigendum to “Thermo-hydrodynamic behavior of an innovative solar chimney” [Renew. Energy 145 (2020) 2074–2090]
    (Elsevier, 2020) Kebabsa, Hakim; Lounici, Mohand Said; Lebbi, Mohamed; Daimallah, Ahmed
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    Thermo-hydrodynamic behavior of an innovative solar chimney
    (Elsevier, 2020) Kebabsa, Hakim; Lounici, Mohand Said; Lebbi, Mohamed; Daimallah, Ahmed
    Production of electricity through solar systems is a viable alternative, especially for deserted regions where access to electricity is difficult. Solar chimney power plant (SCPP) is one of the promising concepts in renewable energy technology that needs performance enhancement. The objective of this research is to investigate a novel concept, which consists of a horizontal solar chimney power plant with an adapted collector entrance, named sloped collector entrance SCPP (SCESCPP). The effect of the collector entrance shape (slope, sloping distance) is investigated. For each sloping distance, eleven values for the slope are examined. Thus, a numerical investigation is carried out using a 2D axisymmetric chimney model. The model was first validated using experimental results. The influence on air thermo-hydrodynamic behavior of this system is comprehensively studied to enhance the understanding and deepen the analysis in order to improve the performance of the SCPP. The results indicate that the new collector entrance design influences the system performance in a significant manner. It is shown that the best performing configuration (sloping distance of 0.8 and slope of 9.1°) produces an available power reaching 16.36% more than that for zero slope collector roof at same conditions. Moreover, it is found that the optimal slope depends on sloping distance and remains almost the same for different Rayleigh numbers
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    3D-Numerical simulation of the effect of radial gap on the stability of taylor-couette flow
    (2015) Daimallah, Ahmed; Lebbi, M.; Bouabdallah, A.
    We study numerically the effect of the radial gap on the onset of Taylor vortices in Taylor-Couette flow system. The inner cylinder is rotating and the outer is at rest. We interested in the appearance of Taylor vortices for a varied radius of the inner and the outer cylinders while making sure to keep a constant annulus between the cylinders in the aim to examine the influence of centrifugal force on the stability of the flow. The obtained results indicate that the onset of Taylor vortices is delayed when the radial gap is increasing.