Publications Scientifiques

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Author: search.filters.author.Benmounah, AbdelbakiSubject: search.filters.subject.Viscosity

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    Viscosity-boosting effects of polymer additives in automotive lubricants
    (Springer Nature, 2024) Boussaid, Mohamed; Haddadine, Nabila; Benmounah, Abdelbaki; Dahal, Jiba; Bouslah, Naima; Benaboura, Ahmed; El-Shall, Samy
    This study investigated polyethylene glycol (PEG), as a polymer improver of the paraffinic oil viscosity index (VI). The characterization of PEG/paraffinic oil blends at different concentrations (0%, 1%, 2%, 3%, 5%, and 10%), was performed using Raman spectroscopy and optical microscopy. The rheological parameters as the viscosity index and activation energy were determined using the kinematic viscosity measurements. Results showed that the VI improvement reached an optimal value for the blend containing 3% PEG, with greater value for blends containing 2% PEG than 5 and 10% PEG. The presence of polymer particles was observed by optical microscopy, which confirmed the lack of PEG distribution in the blend containing 5%, and more, whereas mixtures with 3 and 2% PEG exhibited good particle distribution, evidenced by smaller polymer particle sizes. This finding was corroborated by Raman spectroscopy, which revealed the absence of polymer–oil intermolecular interactions in the PEG/paraffinic oil blends. The rheological tests showed that increasing the blend temperature from 40 to 80 ℃, improved the PEG chains dispersion in the paraffin oil, for the blends containing up to 3% PEG. The difference of the activation energy of the pure paraffinic oil and the PEG/paraffinic oil blends, (ΔEa) was calculated, and the correlation between the ΔEa and the viscosity index values was established. Therefore, adding PEG to paraffinic oil appeared to be promising for the viscosity index improvement and promote industrial applications of paraffinic oil.
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    Rheological behavior and microstructural properties of crude oil and emulsions (water/oil-oil/water)
    (Taylor & Francis, 2024) Yacine, Celia; Safri, Abdelhamid; Djemiat, Djamal Eddine; Benmounah, Abdelbaki
    An experimental study on crude oil (from the Tin Fouye Tabankort oil field in southern Algeria) was carried out. This study allowed us to understand the rheological behavior of this crude oil with these different emulsions and how it reacts under the effects of temperature and the inversion of its phase from E/H to H/E. So we measured the rheological characteristics by tests flow and dynamic mode at different temperatures from 10 °C to 50 °C and at different water concentrations (20.40.50.60 and 70%) at a fixed temperature of 20 °C. The increase in temperature results in a 31.84% reduction in the initial viscosity of the crude oil. The addition of the volumic fractions of water results in an increase in viscosity at the point of inverse, which will decrease the apparent viscosity of these emulsions where the emulsions (W/O) come from (O/W). This crude oil and their emulsions exhibit a non-Newtonian behavior with shear thinning. The dynamic analysis depends on the temperature and the percentages of water added to the crude oil. At the end, a microscopic analysis was added to verify the relationship between the shape and diameter of the water droplets in each emulsion and the viscosity variation.
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    Comparative studies of the rheological behavior and microstructural properties of emulsions (oil/distilled water phase) and (oil/Lias water phase)
    (Taylor and Francis, 2018) Djemiat, Djamal Eddine; Safri, Abdelhamid; Benmounah, Abdelbaki
    The rheological behavior of crude oil and their emulsions were investigated as a function of two water types (distilled water and the LIAS water). The focus of this work is to obtain more knowledge about the effect of LIAS water concentration, which used to maintain pressure and produced from production of crude oil in the oil fields Tin Fouye Tabankort-south Algeria, on the rheological properties of crude oil. The rheological parameters were measured by using AR-2000 rheometer at 15 °C under dynamic and shear testing conditions. The measured data were first classified into two groups for Newtonian and non-Newtonian fluids. Depends on the type and concentration of water, the non-Newtonian behavior was described in better way by the Casson, Power law and the Herschel–Bulkley models. The results indicated that the viscosity, the yield stress, the elastic modulus, (G′), the loss modulus, (G″), and the microstructure of the prepared emulsions not only varied with water concentration but also by water types.
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    A review on the rheology of heavy crude oil for pipeline transportation
    (ELSEVIER, 2020) Souas, Farid; Safri, Abdelhamid; Benmounah, Abdelbaki
    Given the combination of rising global energy demand and the decline in conventional crudes, heavy crudes are generally considered to be the future energy resource. In many regions of the world, heavy crude oil must be transported through pipelines from the point of production to storage facilities or refineries. The transportation of heavy crude oil by pipeline poses serious problems related to the high viscosity and flow difficulties, particularly in cold climates or offshore conditions. Indeed, the viscosity of crude oil is an important physical property that influences and controls crude oil flow in pipelines. Viscosity introduces resistance to movement by causing a shear or frictional force between the fluid particles and the boundary walls. This high viscosity means that the pumping power requirements for crude oil in a long-distance pipeline are very high in order to overcome the increasing shear and friction forces. Therefore, in order to facilitate the pumping of these viscous oils and reduce operating expenses and the negative impact of pressure drops in pipelines during flow and processing, their viscosity must be reduced. Various techniques are used to increase pumping efficiency and improve the flow of crude oil through the pipeline, which may present logistical, technical or economic disadvantages for a given application. The main ones are the addition of surfactants or polymers, dilution with lighter crudes, use of water as annular fluid, thermal remediation and emulsification with surfactant (O/W). This review highlights the methods currently used to enhance the fluidity of heavy crude oil in pipelines behind rheology improvement, in particular the addition of additives and the use of water and surfactants to create a stable emulsion of heavy crude oil in water have been considered.
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    Experimental investigation of the rheological behavior of algerian crude oils from the quagmires
    (Taylor & Francis, 2019) Souas, Farid; Safri, Abdelhamid; Benmounah, Abdelbaki
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    Rheological behavior of an Algerian crude oil containing sodium dodecyl benzene sulfonate (SDBS) as a surfactant : flow test and study in dynamic mode
    (Elsevier, 2015) Djemiat, Djamal Eddine; Safri, Abdelhamid; Benmounah, Abdelbaki; Safi, Brahim