Communications Internationales

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    Comparative Assessment of Non-newtonian Single-Phase and Two-Phase Approaches for Numerical Studies of Centrifugal Pumps Handling Emulsion
    (Springer Nature, 2024) Achour, Lila; Specklin, Mathieu; Asuaje, Miguel; Kouidri, Smaine; Belaidi, Idir
    Computational Fluid Dynamics is commonly employed to assess the effect of oil-water emulsions on pump performance, usually using two-phase models. However, these models often neglect the emulsion’s non-Newtonian behavior, despite its known experimental significance in enhancing pump performance. This study attempts to evaluate both single-phase non-Newtonian and two-phase approaches to model emulsion flow within centrifugal pumps. The non-Newtonian single-phase and several two-phase models are evaluated by comparing the predicted pump heads with experimental data of a multistage pump from the literature. The findings show that the non-Newtonian single-phase model generally provides better agreement with experimental measurements, particularly for emulsions with low dispersed phase fractions. Nevertheless, for emulsions with a high dispersed phase fraction (≈ 50%), the difference between the two approaches is insignificant. Thus, due to the lack of a universal multiphase model for emulsion simulation, the non-Newtonian single-phase model can serve as a viable alternative, overcoming the limitations of two-phase approaches in simulating complex multiphase fluid systems.
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    Improvement of the Meca-Electrical Wind Pumping System
    (Institute of Electrical and Electronics Engineers Inc, 2023) Djalloul, Achour; Mohamed, Kesraoui
    In this paper an improvement in the mecha-electrical water pumping system is proposed in order to increase the efficiency, the reliability and the flexibility. PV solar panels are added to a system that composed of a wind turbine for mechanical driving of the piston pump. A water storage is used to charge a battery through a DC machine in case of abundance of wind energy. Reversely it will supply electricity in motoring situations where a mechanical support is needed by the wind turbine to drive the piston pump. Adding another renewable source like PV solar panels will increase the assurance of pumping water permanently especially in cut offs situations where even the water storage is not enough to charge the battery. The whole system is presented, electrically and mathematically modeled. Simulation work has been performed and satisfying results in terms of water quantity increase compared to the basic system have been obtained.
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    Numerical study of the performance loss of a centrifugal pump carrying emulsion
    (2021) Achour, Lila; Mathieu, Specklin; Belaidi, Idir; Kouidri, Smaine
    The performance and hydrodynamic behavior of cen- trifugal pumps when handling two-phase liquid-liquid flow and emulsion remain relatively unexplored, al- though they are of fundamental importance in optimiz- ing the operating conditions of these pumps. Hence, this study aims at investigating the performance degra- dation of a centrifugal pump under emulsion flow by combined means of analytical and computational fluid dynamic (CFD) models. The analytical approach is based on internal energy loss equations while the CFD approach models the emulsion as a continuous and ho- mogeneous single-phase fluid exhibiting shear thinning behavior. The results give a good insight into the per- formance degradation of such a system, especially at the best efficiency point (BEP).
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    New concept of wind pumping system : introduction and state of the art
    (IEEE, 2020) Achour, Djalloul; Kesraoui, Mohamed
    In this paper a new concept of wind pumping system that combines the advantages of the mechanical wind pumping system and those of the electrically powered one is proposed. The system consists mainly of a wind turbine, a DC machine and storage facility. The whole system will be controlled in a goal to improve the total power efficiency. First, a literature survey over what has been done up to now on wind pumping is presented. The details of the proposed system design are given. Then, the advantages of the proposed system compared to actual ones are shown. Then since this system is a part of an accepted PRFU national research project 2020-2024, an Algerian windy site for its intended implementation is suggested. Finally the three wind pumping systems are simulated to prove that the developed one has the best results